JP2019003391A - Task management device, task management method and task management program - Google Patents

Abstract

To provide 'a task management device, a task management method and a task management program' suppressing delay of the timing of completion of database construction, and accelerating the timing of completion of other process using the same processing resources as the database construction when performing the database construction based on information received from the outside.SOLUTION: A task management device 100 comprises a memory control unit 32 writing data in a memory 17, a database construction unit 31 generating a database based on the received information and performing a database construction process to be transferred using a second processing resource, and a task management unit 37 determining level of write speed of the memory control unit 32 and decreasing priority of assignment of the second processing resource to a task related to the database construction process as the write speed is faster. Thereby, the priority of the task related to the database construction process is reduced as the write speed of the memory control unit 32 is faster.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a task management device, a task management method, and a task management program, and more particularly to a task management device, a task management method, and a task management program that manage tasks of a device that constructs a database based on information received from an external device. It is suitable for use.

  2. Description of the Related Art Conventionally, there is a system that allows a medium (for example, a smartphone or a tablet terminal) in which music data in which music is recorded to be stored to be connected to an in-vehicle device, and a desired music can be specified and played from the in-vehicle device. . In this type of system, the in-vehicle device acquires additional information such as the song name and artist name of the music from the media and builds a database based on the additional information so that the in-vehicle device can search for the music. There is.

  When the music information is acquired from the media and the user selects a music, the music corresponding to the artist name is searched using the artist name of the music selected by the user as a search key, and the search result is displayed on the display unit. A system is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-175585

  In a device that constructs a database based on information received from an external device, such as the on-vehicle device described above, processing relating to database construction is performed by assigning a task related to the processing to a processing resource such as a CPU. Therefore, when it is necessary to execute another process that uses the same processing resource as the process during the execution of the process related to the database construction, the task processing resource allocation related to the other process is related to the database construction. Compared to the case where the process is not executed, the number of processes is reduced, and the delay of the completion timing of the other process is caused. In order to suppress the delay of the completion timing of the other process, when the priority is fixedly lowered for a task related to the process related to the database construction, the timing of completion of the database construction is delayed.

  The present invention has been made to solve such a problem, and suppresses a delay in completion of database construction when database construction is performed based on information received from an external device. In the above, when another process using the same processing resource as the process related to the construction of the database occurs, the purpose is to speed up the timing for completing the other process.

  In order to solve the above-described problems, in the present invention, a write control unit that executes writing of transferred data to a storage medium using a first processing resource, and a configuration received from an external device A database construction unit that generates a database based on information and executes a database construction process for transferring data constituting the database to the write control unit using a second processing resource different from the first processing resource And a process execution unit that executes another process that is a process other than the database construction process using the second processing resource, the database construction process is executed while the database construction process is executed. Data transferred in the one task by the write control unit after allocating and executing one task to the second processing resource When writing is completed, an attempt is made to allocate the next task related to the database construction processing to the second processing resource, while the level of the writing speed of the writing control unit is determined and the writing speed is high. The priority of assignment of tasks related to database construction processing to the second processing resource is made relatively lower than the priority of tasks related to other processing using the second processing resource. .

  In the case where the database construction process is being executed, after the data is transferred to the write control unit in one task related to the database construction process, the period during which the data is written by the write control unit is the database The task relating to the construction process is not assigned to the second processing resource, and during this period, the task relating to the other process can be assigned to the second processing resource. As the writing speed of the writing control unit increases, the period during which the writing control unit performs writing becomes shorter. For this reason, if the priority of the task related to the database construction process is increased when the writing speed is high, the period during which data is written by the write control unit is short, and the write control unit During the period when writing is not being performed, the second processing resource is preferentially assigned to the task related to the database construction processing, resulting in a delay in the timing for completing other processing. Based on this, according to the present invention configured as described above, the higher the writing speed, the lower the priority of assignment of tasks related to database construction processing to the second processing resource. The higher the speed, the second processing resource is preferentially assigned to the task related to the other process in a period in which the write control unit is not writing data, and the other process is completed. The timing can be made early. Furthermore, according to the present invention configured as described above, the writing speed is slow, and therefore, the period during which data is written by the writing control unit is long, and therefore the second sufficient for tasks related to other processing. In the situation where the processing resources are allocated, the priority of the database construction task does not become low, so the priority of the task related to the database construction processing will not be lowered unnecessarily, and the delay of the completion of database construction is suppressed. can do.

It is a figure which shows the structural example of a vehicle-mounted apparatus provided with the task management apparatus which concerns on 1st Embodiment. It is a block diagram which shows the function structural example of the task management apparatus which concerns on 1st Embodiment. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a flowchart which shows an example of the process by the task management part of the task management apparatus which concerns on 1st Embodiment. It is a block diagram which shows the function structural example of the task management apparatus which concerns on 2nd Embodiment. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a time chart which shows the period of execution time of a database construction task and another processing task, and the period when a writing control part performs writing processing. It is a flowchart which shows an example of the process by the task management part of the task management apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the function structural example of the task management apparatus which concerns on 3rd Embodiment. It is a flowchart which shows an example of the process by the task management part of the task management apparatus which concerns on 3rd Embodiment.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of an in-vehicle device 1 including a task management device 100 according to the present embodiment. The in-vehicle device 1 is a device mounted on a vehicle, and includes a task management device 100, a display 200, a touch panel 300, an audio processing device 400, a media playback device 500, and a radio reception device 600. .

  As shown in FIG. 1, the task management apparatus 100 includes an integrated circuit 10. The integrated circuit 10 is mounted with a CPU 11 (corresponding to “second processing resource” in the claims), a ROM 12, a RAM 13, a clock circuit 14, and an input / output port 15 as electronic components. These electronic components can communicate with each other via a bus 16.

  The CPU 11 is a central processing unit, and controls each unit of the task management apparatus 100 by reading and executing a program stored in the ROM 12. The storage medium storing the program executed by the CPU 11 is not limited to the ROM 12, and may be another storage medium included in the task management apparatus 100, or an external apparatus connected to the task management apparatus 100. Also good. The ROM 12 is a non-volatile memory that stores a program executed by the CPU 11, data associated with the program, and the like. The RAM 13 is a volatile memory in which a work area for the CPU 11 is formed.

  The clock circuit 14 includes an oscillation circuit, a frequency dividing circuit, and the like, and outputs a clock signal having a predetermined frequency to the CPU 11. A task management unit 37 to be described later executes various timing processes such as task time management based on a clock signal input from the clock circuit 14. The input / output port 15 is a port for inputting / outputting signals to / from various interfaces described later.

  As shown in FIG. 1, the task management apparatus 100 includes a memory 17 (corresponding to a “storage medium” in the claims). In the present embodiment, the memory 17 is a hard disk. However, the memory 17 may be a storage medium that can store data in a rewritable manner and has a storage capacity sufficient to store a music information database DB1 described later. For example, the memory 17 may be various flash memories. A memory controller 18 (corresponding to “first processing resource” in the claims) is connected to the memory 17. The memory controller 18 is a dedicated controller that executes writing of data into the memory 17 and reading of data from the memory 17, and is configured by, for example, a CPU or an IC chip. The memory controller 18 is connected to the input / output port 15 via the memory interface 19.

  As shown in FIG. 1, the task management apparatus 100 includes a communication module 20. The communication module 20 is a communication interface to which an external device can be connected and communicates with the connected external device according to a predetermined communication standard. In the present embodiment, a mobile terminal KT (for example, a smartphone or a tablet terminal; see FIG. 2) owned by a passenger (hereinafter simply referred to as “user”) who rides on a vehicle is connected to the communication module 20 as an external device. Is done. The communication standard used for communication between the communication module 20 and the portable terminal KT may be a communication standard related to wireless communication or a communication standard related to wired communication. A communication standard related to wireless communication is, for example, Bluetooth (registered trademark) or Wi-Fi (registered trademark). A communication standard related to wired communication is, for example, USB or Ethernet (registered trademark). The communication module 20 is connected to the input / output port 15 via the communication module interface 21 of the task management apparatus 100.

  The display 200 is a display panel (a liquid crystal display panel, an organic EL panel, or the like) provided at the center of the dashboard of the vehicle. The display 200 is connected to the input / output port 15 via the display interface 22. The touch panel 300 is a touch sensor disposed on the display 200, detects a touch operation by the user, and outputs a signal indicating a position where the touch operation is performed. The touch panel 300 is connected to the input / output port 15 via the touch panel interface 23 of the task management apparatus 100.

  The audio processing device 400 includes a D / A converter, a volume, an amplifier, an in-vehicle speaker, and the like, D / A-converts and amplifies the input audio signal, and then outputs audio based on the audio signal from the in-vehicle speaker. The voice processing device 400 is connected to the input / output port 15 via the voice processing device interface 24 of the task management device 100. For example, the CPU 11 outputs an audio signal to the audio processing device 400 via the audio processing device interface 24 and outputs audio from the audio processing device 400 when reproducing the moving image based on the moving image file stored in the memory 17. .

  The media playback device 500 is a device that plays a CD. The media playback device 500 reads audio data from the stored CD, and outputs an audio signal based on the audio data read from the CD to the audio processing device 400. The media playback device 500 is connected to the input / output port 15 via the media playback device interface 25 of the task management device 100. Note that the media to be played back by the media playback device 500 is not limited to a CD, and may be a DVD or an MD, for example.

  The radio reception device 600 receives a radio broadcast (AM radio broadcast or FM radio broadcast) of a channel selected by the user, and outputs an audio signal based on the received radio broadcast to the audio processing device 400. The radio reception device 600 is connected to the input / output port 15 via the radio reception device interface 26 of the task management device 100. Note that the radio broadcast received by the radio reception device 600 is not limited to an analog broadcast, and may be a digital broadcast.

  FIG. 2 is a block diagram illustrating a functional configuration example of the task management apparatus 100 according to the present embodiment. As shown in FIG. 2, the task management apparatus 100 according to the present embodiment corresponds to a communication unit 30, a database construction unit 31, and a memory control unit 32 (corresponding to “write control unit” in the claims) as its functional configuration. ), Memory-related process execution unit 33 (corresponding to “other process execution unit” in claims), media-related process execution unit 34 (corresponding to “other process execution unit” in claims), radio-related process execution A unit 35 (corresponding to “other processing execution unit” in the claims), an access amount detection unit 36, and a task management unit 37.

  Among the functional blocks 30 to 37, the database construction unit 31, the memory-related process execution unit 33, the media-related process execution unit 34, the radio-related process execution unit 35, the access amount detection unit 36, and the task management unit 37 are as processing resources. Processing is executed using the CPU 11 (second processing resource). That is, the functional blocks 31, 33 to 37 execute their functions and execute various processes by executing information processing by a program stored in a storage medium such as the ROM 12 using the CPU 11 as a hardware resource. To do.

  In particular, the function of the task management unit 37 can be realized by recording a task management program on a recording medium such as a CD-ROM and reading it into a computer. As a recording medium for recording the program, a flexible disk, a hard disk, a magnetic tape, an optical disk, a magneto-optical disk, a DVD, a nonvolatile memory card, and the like can be used in addition to the CD-ROM. It can also be realized by downloading the program to a computer via a network such as the Internet.

  On the other hand, the memory control unit 32 executes processing using the memory controller 18 (first processing resource) which is a processing resource different from the CPU 11 as a processing resource. That is, the memory control unit 32 performs hardware processing for signal processing by a signal processing circuit mounted on a chip and information processing by a program stored in a predetermined storage medium (for example, a ROM mounted on the memory controller 18). When executed using a CPU, the CPU exhibits its functions and executes various processes. Moreover, the communication part 30 performs a process using the communication module 20 as a processing resource. The communication unit 30 executes processing in cooperation with hardware included in the communication module 20 and a program that controls the hardware.

  The communication unit 30 is connectable with a portable terminal KT owned by a passenger (user) who rides in the vehicle, and communicates with the connected portable terminal KT according to a predetermined communication standard. The state in which the portable terminal KT is connected to the communication unit 30 means that a communication link is established between the portable terminal KT and the communication unit 30 according to the communication standard to be used, the specific software of the portable terminal KT, and the task management device It means a state in which data can be transmitted / received to / from 100 specific software.

  The database construction unit 31 receives music information (corresponding to “construction information” and “additional information” in the claims) from the portable terminal KT connected to the communication unit 30 via the communication unit 30. Then, the database construction unit 31 generates a music information database DB1 (corresponding to the “database” in the claims) based on the received music information, and transmits data constituting the music information database DB1 to the memory control unit 32. Execute the database construction process to be transferred. As described above, the database construction unit 31 executes the database construction process using the CPU 11 as a processing resource. As will be described in detail later, the database construction process is executed by the task management unit 37 assigning a task related to the process to the CPU 11. Hereinafter, the processing of the database construction unit 31 will be described in detail.

  Prior to the database construction process, the mobile terminal KT is connected to the communication unit 30 and a predetermined application (which may be part of the OS) installed in the mobile terminal KT is started. The predetermined application may be configured to automatically start when connected, or may be configured to start according to a user instruction. When the predetermined application starts up, a function block (hereinafter referred to as an “application execution unit” and denoted by “KTa” as a symbol) that executes the predetermined application in the mobile terminal KT and the database construction unit 31 A logical communication path (connection) is established, and data can be transmitted and received between these functional blocks.

  When there is a touch operation for instructing the touch panel 300 to start the database construction process, the database construction unit 31 transmits music information to the application execution unit KTa of the mobile terminal KT via the communication unit 30. The music information transmission request notification requesting is transmitted. Instead of transmitting the music information transmission request notification with the user's instruction as a trigger, the music information transmission request notification may be automatically transmitted when the portable terminal KT is connected to the communication unit 30. In addition, the database construction unit 31 does not transmit the music information transmission request notification, but the application execution unit KTa of the mobile terminal KT automatically transmits the music information when the mobile terminal KT is connected to the communication unit 30. But you can.

  Here, the mobile-side database is stored in advance in the storage area of the mobile terminal KT. The mobile-side database is a database that stores music data (corresponding to “voice data” in claims) and music information in association with each other. The music data is audio data in a predetermined audio file format. In the present embodiment, the music data is recorded with a music with an artist performing the performance and the name of the music. The music information is information relating to the music recorded in the music data, such as music identification information (hereinafter referred to as “music ID”) recorded in the music data, artist name, music title, album name, genre, and the like. . In this embodiment, the music information includes a music ID, an artist name, a music title, an album name, and a genre. The artist name, song title, album name, and genre are information that can be used as metadata for a search using a search key.

  When receiving the music information transmission request notification, the application execution unit KTa of the mobile terminal KT refers to the mobile-side database and transmits the music information for each of the music data stored in the mobile-side database.

  The communication unit 30 of the task management device 100 receives music information transmitted from the application execution unit KTa of the portable terminal KT for each music. The communication unit 30 sequentially stores the received music information in a reception buffer (not shown). The database construction unit 31 sequentially reads the music information stored in the reception buffer and executes the database construction process. Note that the reception of the music information by the communication unit 30 and the storage of the music information in the reception buffer and the database construction processing by the database construction unit 31 are performed independently and asynchronously.

  In the database construction process, the database construction unit 31 generates a music information database DB1 in the work area of the RAM 13 based on the music information (= music information read from the reception buffer) received from the application execution unit KTa of the mobile terminal KT. Execute the process. The music information database DB1 is generated by sequentially adding records having music information to the database according to the data format of the music information database DB1. In parallel with the generation of the music information database DB1, the database construction unit 31 sequentially transfers data constituting the music database DB1 (hereinafter referred to as “database configuration data”) to the memory control unit 32. As described above, in the database construction process, the music information database DB1 is generated and the database configuration data is transferred. When the generation of the music database DB1 based on all the music information received from the application execution unit KTa of the portable terminal KT and the transfer of the database configuration data are completed, the database construction process is completed.

  The memory control unit 32 writes the data transferred from the database construction unit 31 to the memory 17 using the memory controller 18 as a processing resource. As described above, in the database construction process, the database construction unit 31 transfers the database configuration data to the memory control unit 32. The memory control unit 32 writes the database configuration data transferred from the database construction unit 31 into the memory 17. When writing of all the database configuration data composing the music information database DB1 is completed, the music information database DB1 based on all the music information received from the application execution unit KTa of the portable terminal KT is stored in the memory 17, Construction of the music information database DB1 is completed.

  The constructed music information database DB1 is used in the following manner. That is, the music information database DB1 is used for a search using an artist name or the like as a search key (for example, search for a song name using an artist name as a search key). For example, the in-vehicle device 1 performs a search using an artist name or the like as a search key using the music information database DB1 in accordance with a user instruction. The search key is input to, for example, a predetermined user interface provided to the user. In the present embodiment, the user can select an arbitrary song from among the searched songs as a song to be played. When the music is selected by the user, the in-vehicle device 1 communicates with the portable terminal KT and reproduces the music data of the music selected by the user by means such as streaming reproduction.

  As will be described later, the database construction process is executed by the CPU 11 repeatedly executing a task related to the process. For each task, the memory control unit 32 writes the database configuration data transferred by each task.

  The memory related process execution unit 33 executes a memory related process. The memory-related processing is processing that uses the CPU 11 as a processing resource, and is processing that accompanies access to the memory 17 (= processing that uses the memory 17 as a source). The database construction process described above is not included in the memory related process.

  The memory-related processing is, for example, as follows. That is, in this embodiment, a database in which a plurality of moving image files are stored in the memory 17 in advance is stored. The memory-related process execution unit 33 appropriately executes a search for a moving image using a database in which a plurality of moving image files are stored, a reproduction of a moving image based on a moving image file stored in the database, and the like according to a user operation. The retrieval of the moving image using the database and the reproduction of the moving image based on the moving image file are processes involving access to the memory 17 and correspond to memory related processes.

  The media related processing execution unit 34 executes media related processing. The media-related processing is processing that uses the CPU 11 as a processing resource, and is processing that accompanies access to the media playback device 500 (= processing that uses the media playback device 500 as a source). The media-related process execution unit 34 generates control data as appropriate according to a user operation and transmits the control data to the media playback device 500. The media playback device 500 starts playback of a CD, fast forwards or rewinds a track to be played back. , Pause the track being played, etc. The process of generating control data in response to a user operation and controlling the media playback device 500 is a process involving access to the media playback apparatus 500 and corresponds to a media-related process.

  The radio related process execution unit 35 executes a radio related process. The radio-related process is a process that uses the CPU 11 as a processing resource, and is a process that accompanies access to the radio reception device 600 (= a process that uses the radio reception device 600 as a source). The radio-related process execution unit 35 appropriately generates control data according to a user operation and transmits the control data to the radio reception device 600, and causes the radio reception device 600 to perform presetting, channel change, and the like. The process of generating control data in response to a user operation and controlling the radio reception device 600 is a process that accompanies access to the radio reception device 600 and corresponds to a radio-related process.

  The access amount detection unit 36 detects the simultaneous access amount to the memory 17. The amount of simultaneous access to the memory 17 is a task that executes a process that involves writing data to the memory 17 or reading data from the memory 17 among the generated tasks (not necessarily in the execution state). The greater the number of tasks, the greater the amount of simultaneous access. As the simultaneous access amount increases, the processing load on the memory controller 18 increases. Therefore, when one task requests the memory control unit 32 to write data to the memory 17, the writing speed (can be written in unit time). Data amount) becomes slow. Any method may be used for the access amount detection unit 36 to detect the simultaneous access amount. For example, the simultaneous access amount is provided by the OS function of the task management apparatus 100.

  While the database construction process is executed by the database construction part 31, the task management part 37 assigns and executes one task related to the database construction process to the CPU 11 and then transfers the task in the one task by the memory control part 32. When the writing of the completed data is completed, an attempt is made to assign the next task related to the database construction process to the CPU 11. Then, the task management unit 37 determines the level of the writing speed of the memory control unit 32, and lowers the priority of assignment of tasks related to database construction processing to the CPU 11 as the writing speed is higher. In addition, the task management unit 37 determines the writing speed level by reflecting the simultaneous access amount detected by the access amount detection unit 36 when determining the writing speed level.

  Hereinafter, the processing of the task management unit 37 will be described in detail. In the following description, processes other than the database construction process and using the CPU 11 as a processing resource are collectively referred to as “other processes”. The above-described memory-related processing, media-related processing, and radio-related processing are each included in “other processing”.

  The task management unit 37 realizes priority-type multitasking by the OS function of the task management apparatus 100. The task management unit 37 manages each task using the CPU 11 as a processing resource by generating a task at the start of the process, disappearing the task at the end of the process, and transitioning the task state. Although details are omitted, task generation / disappearance and task state transition are appropriately executed for the CPU 11 based on interrupt signals input from the OS and other systems. As is well known, in multitasking, there are “execution state”, “executable state”, and “standby state” as task states.

  The execution state is a state in which the CPU 11 is assigned and a task is being executed. An executable state is a state that can be changed to an execution state (a state in which all the conditions necessary for executing a task are satisfied), while another task with a high priority is an execution state, This is a state waiting for the task state to transition. The standby state is a state in which a condition necessary for executing a task is not satisfied, such as an input / output completion waiting state, and a transition to the execution state is not possible. In this embodiment, the input / output completion waiting state includes a state in which the memory control unit 32 waits for completion of writing of the database configuration data.

  The task management unit 37 assigns a priority to each task, and manages the priority assigned to each task by the task control block. When there are a plurality of tasks in the executable state, the task management unit 37 transitions the task having the highest priority to the execution state, and maintains the executable state for tasks other than the task having the highest priority.

  When the database construction process is started, the task management unit 37 according to the present embodiment manages a task related to the database construction process (hereinafter referred to as “database construction task”) by the following method. That is, the task management unit 37 generates a database construction task in response to the start of the database construction process, and puts the task into an executable state. When the priority of the database construction task is the highest compared to the priorities of other tasks, the task management unit 37 transitions the database construction task to the execution state (= assigns the database construction task to the CPU 11 and executes it). . While the database construction task is in the execution state, the CPU 11 executes a certain program corresponding to the task to perform a process for generating the music information database DB1 and a process for transferring the database configuration data. When the program is executed, a predetermined amount of database configuration data is transferred to the memory control unit 32, and the database construction task is in a state of waiting for completion of input / output (in this case, waiting for completion of writing to the memory 17). Become.

  When the task management unit 37 detects that the database construction task is in an input / output completion waiting state based on the interrupt signal, the task management unit 37 transitions the database construction task to a standby state. Thereafter, when the task management unit 37 detects that the writing of the database configuration data for the amount transferred to the memory control unit 32 is completed by the memory control unit 32 based on the interrupt signal, the task management unit 37 executes the database construction task. Transition to the executable state. That is, the task management unit 37 allocates the next task related to the database construction process to the CPU 11 when the writing of the database configuration data transferred in the one task related to the database construction processing by the memory control unit 32 is completed. Try.

  While the database construction process is being performed, the task management unit 37 further executes a priority setting process described below at a predetermined cycle. That is, in the priority setting process, first, the task management unit 37 acquires the simultaneous access amount detected by the access amount detection unit 36. In the present embodiment, the access amount detection unit 36 detects the simultaneous access amount at the predetermined cycle. After acquiring the simultaneous access amount, the task management unit 37 determines the write speed level of the memory control unit 32. In the present embodiment, based on the fact that the simultaneous access amount affects the writing speed, the task management unit 37 determines the level of the writing speed based on the simultaneous access amount detected by the access amount detection unit 36. .

  More specifically, in the present embodiment, as the writing speed level, a level indicating that the writing speed is high (hereinafter referred to as “high speed level”) and a level indicating that the writing speed is low (hereinafter referred to as “high speed level”). There are two types of "low speed level". Then, the task management unit 37 determines that the level of the writing speed is a high speed level when the acquired simultaneous access amount is below a predetermined threshold, and the level of the writing speed is higher than the predetermined threshold. It is determined that the speed is low.

  After determining the writing speed level, when the writing speed level is high, the task management unit 37 sets the priority of the database construction task relatively lower than the priority of the task related to other processing. To do. That is, when the database construction task and the task related to other processing are both executable, the task management unit 37 preferentially enters the task related to other processing (= the CPU 11 is preferentially assigned). To be done). On the other hand, when the level of the writing speed is the low speed level, the task management unit 37 sets the priority of the database construction task relatively higher than the priority of the task related to other processing. That is, the task management unit 37 preferentially puts the database construction task into the execution state when the database construction task and the task related to other processes are both executable (= the CPU 11 is preferentially assigned). ) Thus, in this embodiment, the task management unit 37 sets the priority of assignment of tasks related to the database construction process to the CPU 11 relative to the priority of tasks related to other processes as the writing speed increases. Make it relatively low. In other words, the task management unit 37 increases the priority of the assignment of the CPU 11 of the task related to the database construction process relative to the priority of the task related to the other process as the writing speed is slower.

  Note that the simultaneous access amount dynamically changes with time. Therefore, the priority of the database construction task dynamically changes according to the change in the simultaneous access amount.

  While the database construction process is being executed, another process (a process executed using the CPU 11 as a processing resource) may be executed in parallel with the database construction process. In particular, the greater the amount of music information transmitted by the portable terminal KT and the longer the time required for the database construction process, the higher the possibility that other processes will be executed in parallel with the database construction process. Here, since the user cannot search for the music using the music information database DB1 until the database construction is completed, the longer the time required for executing the database construction processing, the lower the user satisfaction. Further, in the case where the other process is a process that is executed with a user operation as a trigger, the longer it takes for the process to be executed and the process result to be reflected after the user performs the user operation (= others) As the processing completion timing is delayed), the user's satisfaction level decreases.

  When it is necessary to execute another process that uses the same processing resource (CPU 11) as that process during the execution of the database construction process, the assignment of the CPU 11 of the task related to the other process is determined by the database construction process. This is reduced compared to the case where it is not executed, and causes a delay in the timing at which the other processing is completed. If the priority is fixedly lowered for the database construction task in order to suppress the delay of the completion timing of the other processing, the timing of completion of the database construction is delayed.

  Based on the above, according to the present embodiment, the task management unit 37 performs the above-described processing, thereby providing the following effects. That is, when the database construction process is being executed, after the data is transferred to the memory control unit 32 in one task related to the database construction process, the period during which the data is written by the memory control unit 32 is Since the database construction task is in an input / output completion waiting state, the database construction task is not assigned to the CPU 11, and tasks related to other processes can be assigned to the CPU 11 during this period. As the writing speed of the memory control unit 32 increases, the period during which the memory control unit 32 performs writing becomes shorter. Therefore, if the priority of the database construction task is increased when the writing speed is high, the period during which data is written by the memory control unit 32 is short, and the memory control unit 32 further writes the data. When the database construction task and the task related to the other process are both executable during the period when the database construction task is not executed, the CPU 11 is preferentially assigned to the database construction task, and the delay of the timing for completing the other process Invite. Based on this, according to the present embodiment, the higher the writing speed, the lower the priority of the assignment of the database construction task to the CPU 11. Therefore, the higher the writing speed, the more the memory control unit 32 writes data. In a period when the other process is not performed, the CPU 11 is preferentially assigned to the task related to the other process, and the timing at which the other process is completed can be accelerated.

  In addition, according to the present embodiment, the writing speed is slow, and therefore, the period during which data is written by the memory control unit 32 is long, and therefore the CPU 11 is sufficiently allocated to tasks related to other processes. Below, since the priority of a database construction task does not become low, the priority of a database construction task does not become low unnecessarily, and it is possible to suppress a delay in timing for completing the construction of a database.

  In this embodiment, there are two writing speed levels, a high speed level and a low speed level, and the task management unit 37 determines the priority of the database construction task when the writing speed level is the high speed level. When the write speed level is low, the priority of the database construction task is set to be relatively lower than the priority of the task related to the other process. Make it high. In this regard, the following configuration may be used. That is, three or more levels are provided as the writing speed, and the task management unit 37 gradually decreases the priority of the database construction task as the writing speed is higher in accordance with the writing speed level. The configuration may be such that the priority of the database construction task is increased stepwise as the insertion speed is lower. According to this configuration, the higher the writing speed, the lower the priority of the database construction task, and when the database construction task and the other processing task are both executable, the other processing task is preferentially executed. Can increase the possibility of being. In addition, according to this configuration, the lower the writing speed, the higher the priority of the database construction task, and the database construction task has priority when both the database construction task and other processing tasks become executable. Can increase the possibility of being executed. Thereby, the effect similar to the effect mentioned above can be show | played.

  In the following description, a task related to other processing is referred to as “other processing task”. In addition, a process in which the memory control unit 32 writes the transferred data to the memory 17 is referred to as a “write process”.

  FIG. 3 shows a period in which the CPU 11 is assigned to the database construction task (= period of execution state) and a period in which the CPU 11 is assigned to the task related to the other process when other processes are performed in parallel with the database construction process. 4 is a time chart showing together with a period during which the memory control unit 32 performs a writing process. In FIG. 3, the axis J3A indicates the time period in which the CPU 11 is assigned to the other processing task in time series, the axis J3B indicates the time period in which the CPU 11 is assigned to the database construction task in time series, and the axis J3C performs the writing process. The period is shown in time series.

  FIG. 3 shows a case where the task management unit 37 determines that the writing speed level is a high speed level and gives a relatively lower priority to the database construction task than other processing tasks. The period during which the CPU 11 is allocated to other processing tasks is shown.

  In FIG. 3, for convenience of explanation, the following is assumed. In other words, after the database construction task has entered the execution state, the execution of a certain program corresponding to the task is uniformly terminated when 20 milliseconds have elapsed, and enters a state of waiting for input / output completion. As described above, when the database construction task enters an input / output completion waiting state, the task management unit 37 transitions the task to a standby state.

  In the description of FIG. 3, the other processing task has a time quantum of 40 milliseconds. Therefore, the other processing task is forcibly transitioned to the executable state after the lowest priority is given by the task management unit 37 when 40 milliseconds have elapsed after the other processing task has entered the execution state. This lowest priority is a priority lower than a priority “low” described later, and is given specifically to a task that has used up the time quantum. The task management unit 37 resets the priority and gives the original priority when 20 milliseconds have elapsed after giving the lowest priority to the other processing task.

  In the description of FIG. 3, the timing T0 is the starting point of the elapsed time in the figure, and each timing is added with a number (unit: “millisecond”) indicating the elapsed time from the timing T0 to the term “timing T”. Represented by the name. For example, a timing when 20 milliseconds elapse from the timing T0 is expressed as a timing T20, and a timing when 100 milliseconds elapses from the timing T0 is expressed as a timing T100.

  In FIG. 3, it is assumed that only the database construction task and other processing tasks are allocated to the CPU 11, and in the description, tasks other than these tasks are not considered.

  In FIG. 3, the priorities are “high”, “medium”, and “low” in descending order. The other processing tasks are always given “medium” as the priority, except during the period when the priority is forcibly given to the task management unit 37 due to the time quantum being used up. The

  The premise of the above is the same for FIGS. 4 to 8 used for explaining the first embodiment and FIGS. 10 and 11 used for explaining the second embodiment.

  Further, FIG. 3 assumes the following. That is, one other process is uniformly executed when the other process tasks are totaled to be in an execution state for 60 milliseconds (= when the total time allocated to the CPU 11 is 60 milliseconds). Complete.

  The premise of the above is also the same for FIGS. 4 to 8 used in the description of the first embodiment.

  Further, FIG. 3 assumes the following. That is, during the period shown in FIG. 3, the task management unit 37 continues to determine the writing speed level as the high speed level, and gives the priority “low” as the priority to the database construction task. In FIG. 3, the time required to write the database configuration data transferred to the memory control unit 32 in the database construction task in the memory 17 is “10 milliseconds”. In FIG. 3, the database construction process is started at timing T0, and the other processes are started at timing T20.

  Now, as shown in FIG. 3, the database construction process is started at the timing T0. In response to this, as indicated by the axis J3B, the task management unit 37 sets the database construction task to the execution state for a period of 20 milliseconds from timing T0 to T20. As indicated by the axis J3C, during a period of 10 milliseconds from the timing T20 to T30, the memory control unit 32 performs a writing process on the database configuration data transferred by the database construction task executed in the period from the timing T0 to T20. Run.

  Further, as shown in FIG. 3, at timing T20, another process is started. During the period from timing T20 to T30, the database construction task is in a standby state, so the task management unit 37 sets the other processing task to the execution state during the period. When the writing process is completed at timing T30, the task management unit 37 shifts to a state in which the database construction task can be executed. However, in FIG. 3, the priority of the database construction task (priority “low”) is lower than the priority of other processing tasks (priority “medium”). For this reason, the task management unit 37 continues to assign the CPU 11 to the other processing task with the other processing task in the execution state, while maintaining the state of the database construction task in the executable state.

  As indicated by the axis J3A, the other processing task uses up the time quantum at the timing T60. At time T60, the task management unit 37 gives the lowest priority to the other processing task, and then transitions the other processing task to an executable state. As a result, at timing T60, the other processing task and the database construction task become executable, but the priority is higher in the database construction task. Therefore, as indicated by the axis J3B, the task management unit 37 transitions the database construction task to the execution state.

  As indicated by the axis J3B and the axis J3C, the task management unit 37 sets the database construction task to an execution state for a period of 20 milliseconds from timing T60 to T80. Further, the writing process is executed for a period of 10 milliseconds from timing T80 to T90. As indicated by the axis J3B, the task management unit 37 shifts the database construction task to the standby state at timing T80. As indicated by the axis J3A, the task management unit 37 resets the priority of the other processing task and transitions the other processing task to the execution state at timing T80.

  As shown in the axes J3A and J3B, when the writing process is completed at the timing T90, the task management unit 37 shifts to a state in which the database construction task can be executed. However, in FIG. 3, the priority of the database construction task (priority “low”) is lower than the priority of other processing tasks (priority “medium”). For this reason, the task management unit 37 continues to assign the CPU 11 to the other processing task with the other processing task in the execution state, while maintaining the state of the database construction task in the executable state.

  As indicated by the axis J3A, at the timing T100, the total period during which the other processing task is in the execution state is 60 milliseconds, and the other processing ends. As indicated by the axes J3B and J3C, after the timing T100, the execution of the database construction task of 20 milliseconds and the writing process of 10 milliseconds are alternately executed repeatedly.

  For comparison with FIG. 3, FIG. 4 shows that the task management unit 37 compares the priority of the database construction task relative to the priority of other processing tasks, regardless of the write speed level. Indicates a period in which the CPU 11 is allocated to the database construction task and other processing tasks. If the priority of the database construction task is fixedly increased with the intention of preferentially executing the database construction process regardless of the status of other processes, the CPU 11 is assigned to the database construction task and other processes at the timing shown in FIG. Will be assigned.

  In FIG. 4, the axis J4A indicates the time period in which the CPU 11 is assigned to the other processing task in time series, the axis J4B indicates the time period in which the CPU 11 is assigned to the database construction task in time series, and the axis J4C performs the writing process. The period is shown in time series. In FIG. 4, the task management unit 37 always gives priority “high” as the priority to the database construction task. The other premise is the same as FIG.

  As shown in FIG. 4, the database construction process is started at timing T0. Accordingly, as indicated by the axis J4B, the task management unit 37 sets the database construction process to the execution state during the period of timing T0-T20. Further, as indicated by the axis J4C, the writing process is performed during the period of timing T20-T30. Also, other processing is started at timing T20. As indicated by the axis J4A, the task management unit 37 sets the other processing task to the execution state at timing T20.

  As shown by axis J4C, the writing process is completed at timing T30. In response to the completion of the writing process, at time T30, the task management unit 37 shifts the database construction task to an executable state. The priority of the other processing is “medium”, the priority of the database construction task is “high”, and the priority of the database construction task is higher. Based on this, as shown in the axis J4A and the axis J4B, at the timing T30, the task management unit 37 further transitions the other processing task to the executable state and transitions the database construction task to the execution state.

  As shown in the axis J4A, the axis J4B, and the axis J4C, during the period of the timing T30-T180, “execution of the database construction task for 20 milliseconds” and “execution of the writing process and other processing tasks for 10 milliseconds” It is repeatedly executed alternately. As indicated by the axis J4A, at timing T180, the total period during which the other processing task is in the execution state is 60 milliseconds, and the other processing ends. After the timing T180, the execution of the database construction task for 20 milliseconds and the writing process for 10 milliseconds are alternately executed repeatedly.

  Hereinafter, FIG. 3 and FIG. 4 will be compared. As shown by the axis J3A in FIG. 3, in FIG. 3, after the other process is started at the timing T20, the other process is completed at the timing T100. That is, in FIG. 3, it takes 80 milliseconds to execute other processing. On the other hand, as shown by the axis J4A in FIG. 4, in FIG. 4, after the other process is started at the timing T20, the other process is completed at the timing T180. That is, in FIG. 4, it takes 160 milliseconds to execute other processing. In this way, when the write speed level is high, the time required to execute other processing is reduced by lowering the priority of the database construction task relative to the priority of other processing tasks. Can be greatly shortened. For this reason, when the database construction process is being performed and the other process is executed in parallel according to the user operation, the user can obtain the process result in a short time, and the user satisfaction is high. .

  As shown by the axis J3C in FIG. 3, in FIG. 3, the timing when the writing process for eight times is completed is a timing T280. On the other hand, as shown by the axis J4C in FIG. 4, in FIG. 4, the timing at which the writing process for eight times is completed is a timing T240. As described above, in FIG. 3 according to the present embodiment, when the writing speed level is the high speed level, the database construction process takes 40 milliseconds due to lowering the priority given to the database construction task. Although a delay occurs, the time related to the delay is sufficiently shorter than the time required for executing other processing, and the overall satisfaction of the user can be improved.

  For comparison with FIG. 3, FIG. 5 shows a period in which the CPU 11 is allocated to the database construction task and the other processing task when the task management unit 37 executes the following processing. That is, in FIG. 5, the task management unit 37 always gives the highest priority to the database construction task. After that, the task management unit 37 does not immediately transition the database construction task to an executable state after the writing process by the memory control unit 32 is completed, but starts from the timing when the writing process is completed. The state of the database construction task is forcibly maintained in a standby state for a predetermined period, and then transitions to an executable state.

  By performing such processing, when other processing is executed in parallel with the database construction processing, the CPU 11 can be assigned to another processing task for a predetermined period after the completion of the writing processing. As a result, even when the writing speed is high, the CPU 11 is assigned to another processing task for a predetermined period following the period in which the writing speed is executed, and the time required for processing of the other processing task is reduced. Can be achieved. Conventionally, the task management unit 37 sometimes performs the above-described process with the intention of shortening the time required for other processes performed in parallel with the database construction process. In this case, the CPU 11 is assigned to the database construction task and other processes at the timing shown in FIG.

  In FIG. 5, the axis J5A indicates the time period in which the CPU 11 is allocated to the other processing task in time series, the axis J5B indicates the time period in which the CPU 11 is allocated to the database construction task in time series, and the axis J5C performs the writing process. The period is shown in time series. In FIG. 5, the task management unit 37 always gives priority “high” as the priority to the database construction task. Furthermore, the task management unit 37 does not immediately shift the database construction task to an executable state after the writing process by the memory control unit 32 is completed, but starts from the timing when the writing process is completed. Force the database construction task to remain in the standby state for seconds, and then transition to the executable state. The other premise is the same as FIG.

  As shown in FIG. 5, the database construction process is started at timing T0. Accordingly, as indicated by the axis J5B, the task management unit 37 sets the database construction process to the execution state during the period of timing T0-T20. Further, as indicated by the axis J5C, the writing process is performed during the period of timing T20-T30. Also, other processing is started at timing T20. As indicated by the axis J5A, the task management unit 37 sets the other processing task to the execution state at timing T20.

  As shown by axis J5C, the writing process is completed at timing T30. As indicated by the axis J5B, the task management unit 37 forcibly places the database construction task in a standby state for 20 milliseconds from the timing T30. After that, the task management unit 37 sets the other processing task to the execution state during the period of timing T20 to T50.

  At timing T50, the task management unit 37 transitions to a state in which the database construction task can be executed. In FIG. 5, the priority of the database construction task is higher than the priority of other processing tasks. Based on this, as indicated by the axis J5A and the axis J5B, at the timing T50, the task management unit 37 transitions the database construction task to the execution state and transitions the other processing task to the executable state.

  As indicated by the axis J5B, the task management unit 37 sets the database construction task to the execution state during the period of timing T50-T70. As indicated by the axis J5C, the writing process is performed during the period from timing T70 to T80. As indicated by the axis J5B, the task management unit 37 forcibly places the database construction task in a standby state during a period of timing T80 to T100. As indicated by the axis J5A, during the period of timing T70-T100, the task management unit 37 sets the other processing task to the execution state. At timing T100, the total period during which the other processing task is in the execution state is 60 milliseconds, and the other processing ends. After timing T100, a period of 20 milliseconds in which the database construction task is executed, a period of 10 milliseconds in which the writing process is performed, and a period of 20 milliseconds in which both the database construction task and the writing process are not performed. Appears repeatedly.

  Hereinafter, FIG. 3 and FIG. 5 will be compared. As described above, in FIG. 3, it takes 80 milliseconds to execute other processing. On the other hand, as shown by the axis J5A in FIG. 5, in FIG. 5, after the other process is started at the timing T20, the other process is completed at the timing T100. That is, in FIG. 5, it takes 80 milliseconds to execute other processing. As described above, in FIG. 3 and FIG. 5, when another process is executed in parallel with the database construction process, it takes an equivalent time to execute the other process.

  On the other hand, as described above, in FIG. 3, the timing at which the writing process for eight times is completed is timing T280. On the other hand, as shown by the axis J5C in FIG. 5, in FIG. 5, the timing at which the writing process for eight times is completed is a timing T380. As described above, FIG. 3 according to the present embodiment can greatly shorten the time required for writing the same amount of data and can greatly speed up the completion of the database construction, as compared with FIG.

  FIG. 6 shows a period in which the CPU 11 is assigned to the database construction task (= execution period) and a period in which the CPU 11 is assigned to the task related to the other process when other processes are performed in parallel with the database construction process. 4 is a time chart showing together with a period during which the memory control unit 32 performs a writing process. In FIG. 6, the axis J6A indicates the time period in which the CPU 11 is assigned to the other processing task in time series, the axis J6B indicates the time period in which the CPU 11 is assigned to the database construction task in time series, and the axis J6C performs the writing process. The period is shown in time series.

  FIG. 6 shows a case where the task management unit 37 determines that the writing speed level is a low speed level and gives a relatively higher priority to the database construction task than other processing tasks. The period during which the CPU 11 is allocated to other processing tasks is shown.

  In FIG. 6, the following is assumed. That is, during the period shown in FIG. 6, the task management unit 37 continuously determines that the writing speed level is the low speed level, and gives the priority “high” as the priority to the database construction task. In FIG. 6, the time required to write the database configuration data transferred to the memory control unit 32 in the database construction task in the memory 17 is “30 milliseconds”. That is, in FIG. 5, since the writing speed is slower than that in FIG. 3, the time required for the writing process is longer. Other assumptions are the same as those in FIG.

  In FIG. 6, the database construction process is started at the timing T0. In response to this, as indicated by the axis J6B, the task management unit 37 sets the database construction task to the execution state during the period of the timing T0 to T20. As indicated by the axis J6C, during the period of timing T20-T50, the memory control unit 32 executes the writing process for the database configuration data transferred by the database construction task executed during the period of timing T0-T20.

  In FIG. 6, another process is started at timing T20. During the period from the timing T20 to T50, the database construction task is in the standby state, and therefore the task management unit 37 sets the other processing task to the execution state during the period. When the writing process is completed at timing T50, the task management unit 37 shifts to a state in which the database construction task can be executed. In FIG. 6, the priority of the database construction task (priority “high”) is higher than the priority of other processing tasks (priority “medium”). For this reason, as shown in the axis J6A and the axis J6B, at the timing T50, the task management unit 37 shifts the other processing task to the executable state and shifts the database construction task to the execution state.

  As indicated by the axis J6B and the axis J6C, the task management unit 37 sets the database construction task to the execution state during the period of timing T50-T70. Further, the writing process is executed during the period of timing T70 to T100. As indicated by the axis J6A, during the period of timing T70-T100, the task management unit 37 sets the other processing task to the execution state. At timing T100, the total period during which the other processing task is in the execution state is 60 milliseconds, and the other processing ends. As indicated by the axis J6B and the axis J6C, after the timing T100, the execution of the database construction task of 20 milliseconds and the writing process of 30 milliseconds are alternately executed repeatedly.

  For comparison with FIG. 6, FIG. 7 shows that the task management unit 37 compares the priority of the database construction task relative to the priority of other processing tasks, regardless of the writing speed level. The period during which the CPU 11 is allocated to the database construction task and the other processing task is shown. If the priority of the database construction task is fixedly lowered with the intention of preferentially executing other processing over the database construction processing, the CPU 11 is assigned to the database construction task and other processing at the timing shown in FIG. Will be done.

  In FIG. 7, the axis J7A indicates the time period in which the CPU 11 is assigned to the other processing task in time series, the axis J7B indicates the time period in which the CPU 11 is assigned to the database construction task in time series, and the axis J7C performs the writing process. The period is shown in time series. In FIG. 7, the task management unit 37 always gives priority “low” as a priority to the database construction task. The other premise is the same as FIG.

  As shown in FIG. 7, the database construction process is started at timing T0. Accordingly, as indicated by the axis J7B, the task management unit 37 sets the database construction process to the execution state during the period of timing T0-T20. Further, as indicated by the axis J7C, the writing process is performed during the period of timing T20-T50.

  In FIG. 7, another process is started at timing T20. During the period from the timing T20 to T50, the database construction task is in the standby state, and therefore the task management unit 37 sets the other processing task to the execution state during the period. When the writing process is completed at timing T50, the task management unit 37 shifts to a state in which the database construction task can be executed. However, in FIG. 7, the priority of the database construction task (priority “low”) is lower than the priority of other processing tasks (priority “medium”). For this reason, the task management unit 37 continues to assign the CPU 11 to the other processing task with the other processing task in the execution state, while maintaining the state of the database construction task in the executable state.

  As indicated by the axis J7A, the other processing task uses up the time quantum at timing T60. At time T60, the task management unit 37 gives the lowest priority to the other processing task, and then transitions the other processing task to an executable state. Thus, at timing T60, the other processing task and the database construction task become executable, but the priority is higher in the database construction task. Therefore, as indicated by the axis J7B, the task management unit 37 transitions the database construction task to the execution state.

  As indicated by the axis J7B and the axis J7C, the task management unit 37 sets the database construction task to the execution state during the period from timing T60 to T80. Further, the writing process is executed during the period of timing T80-T110. As indicated by the axis J7B, the task management unit 37 transitions the database construction task to the standby state at timing T80. As indicated by the axis J7A, the task management unit 37 resets the priority of the other processing task and transitions the other processing task to the execution state at timing T80.

  As indicated by the axis J7A, at timing T100, the total period during which the other processing task is in the execution state is 60 milliseconds, and the other processing ends. As indicated by the axes J7B and J7C, the writing process is completed at timing T110. After timing T110, the execution of the database construction task for 20 milliseconds and the writing process for 30 milliseconds are alternately repeated.

  Hereinafter, FIG. 6 and FIG. 7 will be compared. As is clear from comparison between FIG. 6 and FIG. 7, in FIG. 6 and FIG. On the other hand, as shown by the axis J6C in FIG. 6, in FIG. 6, the timing at which the writing process for three times is completed is a timing T150. On the other hand, as shown by the axis J7C in FIG. 7, in FIG. 7, the timing when the writing process for three times is completed is a timing T160. As described above, in FIG. 6, when the writing speed level is a high speed level, the time required to write the same amount of data is increased as compared with FIG. 7 by increasing the priority given to the database construction task. Can be shortened, and the timing of completing the construction of the database can be advanced.

  FIG. 8 is a flowchart illustrating an operation example of the task management unit 37 of the task management apparatus 100 according to the present embodiment. The task management unit 37 repeatedly executes the process shown in the flowchart of FIG. 8 at a predetermined cycle while the database construction process is being executed.

  As shown in the flowchart of FIG. 8, the task management unit 37 acquires the simultaneous access amount detected by the access amount detection unit 36 (step S1). Next, the task management unit 37 determines the write speed level based on the simultaneous access amount acquired in step S1 (step S2). In step S2, the task management unit 37 determines that the level of the writing speed is the high speed level when the acquired simultaneous access amount is below a predetermined threshold value. It is determined that the level is a low speed level.

  Next, the task management unit 37 determines the priority of the database construction task based on the writing speed level (step S3). As described above, the task management unit 37 lowers the priority of the database construction task as the writing speed is higher.

  As a result of the above processing, the priority of the database construction task dynamically changes according to the actual writing speed level so that the higher the writing speed, the lower the priority of the database construction task. To do.

  As described above in detail, the task management unit 37 of the task management apparatus 100 according to the present embodiment allocates one task related to the database construction process to the CPU 11 and executes it while the database construction process is executed. When the memory control unit 32 completes writing the data transferred in the one task, it tries to assign the next task related to the database construction process to the CPU 11. Then, the task management unit 37 determines the level of the writing speed of the memory control unit 32, and lowers the priority of assignment of tasks related to database construction processing to the CPU 11 as the writing speed is higher.

  According to this configuration, as described above, when the music information database DB1 is constructed based on the music information received from the mobile terminal KT, the delay in the timing for completing the construction of the database is suppressed, When another process using the CPU 11 which is the same processing resource as the database construction process occurs, the timing for completing the other process can be advanced.

  In the first embodiment described above, the task management unit 37 determines the level of the writing speed based on the simultaneous access amount to the storage medium (the memory 17 in the first embodiment). In this regard, the task management unit 37 may be configured to determine the write speed level based on the type of storage medium (hard disk, NAND flash memory, NOR flash memory, etc.). This is because there is a difference in writing speed between low speed and high speed depending on the type of storage medium. In this case, for example, the task management unit 37 communicates with the memory control unit 32 and acquires the type of the storage medium. Further, for example, information indicating the type of the storage medium is stored in advance in a predetermined storage area, and the task management unit 37 acquires the type of the storage medium based on the stored information.

  Further, the task management unit 37 may be configured to determine the writing speed level based on the usage period of the storage medium. This is because, generally, the longer the storage medium is used, the more the storage medium ages, and the more the aging progresses, the slower the writing speed. In this case, for example, information indicating the usage period of the storage medium is stored in the log by the functions of the OS and other programs, and the task management unit 37 acquires the usage period of the storage medium based on the log. Further, the task management unit 37 may determine the writing speed level based on the number of times of reading / writing of the storage medium for the same reason as the usage period of the storage medium.

  Note that the type of the storage medium does not change during the database construction process, and the usage period of the storage medium and the number of read / write operations of the storage medium change during the database construction process. It can be considered that the amount is small and does not change. Based on this, in the case of a configuration in which the write speed level is determined based on the type of storage medium, the usage period of the storage medium, or the number of times of reading / writing the storage medium, the task management unit 37 has started the database construction process Sometimes, it is possible to determine the priority to be given to the database construction task by determining the writing speed level and not to change the determined priority while the database construction process is being executed. Further, the writing speed level may be determined by combining two or more of the storage medium type, the storage medium usage period, and the storage medium read / write count. In addition, the write speed level is determined using at least one of the storage medium type, the storage medium usage period, and the read / write count of the storage medium, and then the write speed is further determined based on the simultaneous access amount. It may be configured to adjust the level of the insertion speed.

  As described above, the matters relating to the parameters used when determining the level of the writing speed are the same in the second and third embodiments described later.

  Alternatively, the task management unit 37 may determine the level of the writing speed by actually measuring the writing speed of the memory control unit 32. In the case of this configuration, for example, the task management unit 37 causes the memory control unit 32 to write test data at a predetermined timing, and measures the time required for the writing. The predetermined timing is, for example, a timing when the task management device 100 is turned on. A configuration in which the writing speed is actually measured at regular intervals may be used. According to this configuration, the task management unit 37 can appropriately determine the priority of the database configuration task based on the actual writing speed. The same applies to second and third embodiments described later.

(Second Embodiment)
Next, 2nd Embodiment of this invention is described based on drawing. Note that in the following second embodiment, constituent elements corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 9 is a block diagram illustrating a functional configuration example of the task management apparatus 100A according to the present embodiment. As is apparent from a comparison between FIG. 9 and FIG. 2, the task management device 100A according to the present embodiment includes a task management unit 37A instead of the task management unit 37, and thus the task management according to the first embodiment. The functional configuration of the apparatus 100 is different.

  Here, in the present embodiment, as an operation mode, there is a moving image viewing mode in which a moving image can be viewed using a database of moving image files stored in advance in the memory 17. In this moving image viewing mode, the memory related process execution unit 33 performs memory control on the moving image file stored in the memory 17 as a memory related process by searching for a moving image file using a database in accordance with a user instruction. The process which reads through the part 32 and outputs a moving image is performed. That is, when the operation mode is the moving image viewing mode, the memory related process execution unit 33 executes a process involving access to the memory 17 (= process using the memory 17 as a source) in accordance with a user instruction. The state in which the moving image viewing mode is selected as the operation mode corresponds to the state in which the memory 17 is selected as the source by the user.

  In the present embodiment, for convenience of explanation, the above-described video viewing mode is an operation mode in which the memory-related process execution unit 33 may execute the memory-related process (process involving access to the memory 17). There shall be only. However, instead of the moving image viewing mode or in addition to the moving image viewing mode, there may be an operation mode in which the memory related processing execution unit 33 may execute the memory related processing. For example, in a case where the in-vehicle device 1 has a function (map display function or navigation function) that accompanies a map display and the map data is stored in the memory 17, the map data is displayed by the memory related process execution unit 33. There may be an operation mode in which the processing used is executed.

  In the present embodiment, the operation mode includes a media mode. In this media mode, the media-related process execution unit 34 executes a process that accompanies access to the media playback apparatus 500 (= a process that uses the media playback apparatus 500 as a source) as a media-related process. The state where the media mode is selected as the operation mode corresponds to the state where the media playback device 500 is selected as the source by the user.

  In the present embodiment, the operation mode includes a radio mode. In this radio mode, the radio related process execution unit 35 executes a process that accompanies access to the radio receiving apparatus 600 (= a process that uses the radio receiving apparatus 600 as a source) as a radio related process. The state in which the radio mode is selected as the operation mode corresponds to a state in which the radio reception device 600 is selected as a source by the user.

  The video viewing mode, the media mode, and the radio mode can be exclusively selected, and a plurality of operation modes cannot be selected at the same time.

  In the present embodiment, the task management unit 37A executes the following processing regarding the determination of the priority of the database construction task. In other words, the task management unit 37A uses two parameters for the priority of the database construction task: the “write speed level” and the “predicted processing load of other processes executed in parallel with the database construction process”. And decide.

  As in the first embodiment, the task management unit 37A provisionally determines the priority of the database construction task so that the higher the writing speed level, the lower the priority of the database construction task. In addition, the task management unit 37A predicts the processing load of other processing executed in parallel with the database construction processing, and determines the priority determined based on the writing speed level as the predicted processing load increases. Adjust so that the priority is lower, and determine the final priority. In addition, when predicting the processing load, the task management unit 37A performs the database construction process in parallel with the type of source selected by the user (in this embodiment, the memory 17, the media playback device 500, or the radio reception device 600). Thus, the processing load of other processing to be executed is predicted.

  Hereinafter, the processing of the task management unit 37A will be described in detail. While the database construction process is being performed, the task management unit 37A executes the priority setting process described below at a predetermined cycle. That is, in the priority setting process, first, the task management unit 37A acquires the simultaneous access amount detected by the access amount detection unit 36. Next, the task management unit 37A determines the level of the writing speed of the memory control unit 32. In the present embodiment, as in the first embodiment, there are two writing speed levels, a high speed level and a low speed level. The task management unit 37A determines that the level of the writing speed is a high speed level when the acquired simultaneous access amount is below a predetermined threshold, and the level of the writing speed is a low level when it exceeds the predetermined threshold. It is determined that

  After determining the level of the writing speed, the task management unit 37A predicts the processing load level of other processing executed in parallel with the database construction processing (hereinafter referred to as “other processing load level”). In the present embodiment, as other processing load levels, there are a level “large”, a level “medium”, and a level “small” in descending order of processing load.

  Hereinafter, the processing of the task management unit 37A when predicting the other processing load level will be described in detail. In the present embodiment, as described above, there are a moving image viewing mode, a media mode, and a radio mode as operation modes. These operation modes have different sources. The inventors have found that the processing load of processing executed when the operation mode is selected tends to be large for each operation mode due to different sources. In other words, there are operation modes that tend to generate processing with a large processing load due to different sources for each operation mode, and operation modes that tend to generate processing with a small processing load. If an operation mode that tends to generate a process is selected, the processing load of the process to be executed is likely to be large, while an operation mode that tends to generate a process with a small processing load is selected. If it is, the processing load of the executed process is likely to be small.

  Based on the above, in the present embodiment, the task management unit 37A predicts the other processing load level according to the currently selected operation mode. Specifically, when the video viewing mode is selected as the operation mode, the task management unit 37A predicts the other processing load level as “high”, and when the media mode is selected as the operation mode. The other processing load level is predicted to be “medium”, and when the radio mode is selected as the operation mode, the other processing load level is predicted to be “low”. In this embodiment, the processing load of other processing executed when the video viewing mode is selected tends to be larger than when the other operation mode is selected. The processing load of other processing that is executed when the mode is selected tends to be smaller than when other operation modes are selected, and the processing load of other processing that is executed when the media mode is selected. The processing load means that the processing load tends to be intermediate between the processing load when the moving image viewing mode is selected and the processing load when the radio mode is selected.

  Note that the operation mode currently selected is recorded in the setting file, and the task management unit 37A refers to the setting file and recognizes the operation mode currently selected. The method of recognizing the operation mode by the task management unit 37A may be any method.

,
After predicting the other processing load level, the task management unit 37A provisionally determines the priority of the database construction task by the same method as in the first embodiment, according to the level of the writing speed. That is, when the writing speed level is the high speed level, the task management unit 37A provisionally gives the database construction task a lower priority than the priority of the task related to the other processing. On the other hand, when the writing speed level is the low speed level, the task management unit 37A provisionally gives a higher priority to the database construction task relative to the priority of the task related to the other processing. Hereinafter, the provisionally determined priority is referred to as “provisional priority”.

  Then, the task management unit 37A adjusts the provisional priority based on the predicted other processing load level. More specifically, the task management unit 37A constructs a database when the predicted other processing load level is “high” when the provisional priority is a priority relatively higher than the priority of the other processing task. The final priority of the task is set to a relatively low priority with respect to the priority of the task related to other processing. In addition, the task management unit 37A, when the provisional priority is a relatively low priority with respect to the priority of the other processing task, and the predicted other processing load level is “low”, the database management task The final priority is a relatively high priority with respect to the priority of other processing tasks. In other cases, the task management unit 37A sets the provisional priority as the final priority of the database construction task.

  For example, it is assumed that there are “high”, “medium”, and “low” as task priorities. Then, it is assumed that “medium” is given as a fixed priority for other processing. In this case, the task management unit 37A sets the provisional priority to high priority when the writing speed level is low, and sets the provisional priority to low priority when the writing speed level is high speed. " Then, even if the provisional priority is the priority “high”, the task management unit 37A sets the final priority to the priority “low” if the predicted other processing load level is the level “high”. " On the other hand, even if the provisional priority is the priority “low”, the task management unit 37A sets the final priority to the priority “high” if the predicted other processing load level is the level “low”. "

  In the present embodiment, the task management unit 37A determines the final priority of the database construction task by the above-described method, thereby providing the following effects. In other words, when the priority of the database construction task is higher than the priority of other processing tasks, the other processes are basically compared to the case where the priority of the database construction task is lower than the priority of other processing tasks. The degree of delay of the completion timing is large. Furthermore, when the priority of the database construction task is set higher than the priority of the other processing task, the larger the processing load of the other processing executed in parallel with the database construction processing, the higher the timing of completion of the other processing. The degree of delay increases. Therefore, even if the writing speed is slow, if the processing load of other processing is very large, the processing of the other processing is completed if the priority of the database construction task is made higher than the priority of the other processing task. There can be a significant delay in timing.

  Based on the above, according to the present embodiment, even if the provisional priority is the priority “high”, the task management unit 37A determines that the final processing load level is “high” and the final level is “high”. The priority is set to “low”. For this reason, in a situation where there is a high possibility that other processing with a large processing load will occur, when other processing with a large processing load actually occurs, the timing at which the other processing is completed can be prevented from being significantly delayed, It can suppress that a user's satisfaction falls. In this embodiment, as described above, the operation mode and the other processing load level are associated with each other, and the other processing load level is predicted according to the selected operation mode. Whether or not the mode is associated with other processing load level of “high” is significant when the priority of the database construction task is higher than the priority of the other processing task when the one operation mode is selected. It is determined appropriately in consideration of whether or not other processing with a higher processing load as the delay occurs occurs at a considerable frequency.

  In addition, when the processing load of other processes executed in parallel with the database construction process is very small, even if the priority of the database construction process is increased due to the high writing speed, The delay of the completion timing of the processing is so small that it does not affect the user satisfaction. This is because the other processing task can be completed in a short time even if the other processing task is executed only during the period in which the database construction processing is waiting for the completion of input / output. Based on this, according to the present embodiment, even if the provisional priority is the priority “low”, the task management unit 37A determines that the final processing load level is “low” and the final level is “low”. The priority is set to high priority. For this reason, it is possible to complete the construction of the database more quickly, while taking advantage of the high possibility that other processing with a low processing load will occur and suppressing the decrease in user satisfaction due to delays in other processing. It should be noted that whether or not the other operation load level of level “small” is associated with one operation mode depends on whether the priority of the database construction task is higher than the priority of the other process task when the one operation mode is selected. Even if it is high, it is necessary to consider whether or not other processing with a processing load small enough to cause only a minute delay that does not affect user satisfaction can occur at a considerable frequency. Determined.

  FIG. 10 shows a period in which the CPU 11 is assigned to the database construction task (= period of execution state) and a period in which the CPU 11 is assigned to the task related to the other process when other processes are performed in parallel with the database construction process. 4 is a time chart showing together with a period during which the memory control unit 32 performs a writing process. In FIG. 10, the axis J10A indicates the time period in which the CPU 11 is assigned to the other processing task in time series, the axis J10B indicates the time period in which the CPU 11 is assigned to the database construction task in time series, and the axis J10C performs the writing process. The period is shown in time series.

  FIG. 10 shows a case where the task management unit 37A determines that the writing speed level is a high speed level, and gives a relatively lower priority as a provisional priority to the database construction task than other processing tasks. The period during which the CPU 11 is allocated to the database construction task and the other processing task is shown.

  FIG. 10 assumes the following. That is, during the period shown in FIG. 10, the task management unit 37A continues to determine that the writing speed level is the high speed level, and gives the priority “low” as the provisional priority to the database construction task. In FIG. 10, the time required to write the database configuration data transferred to the memory control unit 32 in the database construction task in the memory 17 is “10 milliseconds”. In FIG. 10, the database construction process is started at timing T0.

  Also, in FIG. 10, the other processing that occurs when the moving image viewing mode is selected as the operation mode is the case where the total processing tasks are executed for 100 milliseconds (= assigned to the CPU 11). When the accumulated time reaches 100 milliseconds), the processing is completed uniformly. In addition, the other processing that occurs when the media mode is selected as the operation mode is the total of the other processing tasks in the execution state for 60 milliseconds (= total time allocated to the CPU 11 is 60). If it is millisecond), the process is completed uniformly. Further, the other processing that occurs when the radio mode is selected as the operation mode is the total processing time of the other processing tasks is 20 milliseconds (= the total time allocated to the CPU 11 is 20). If it is millisecond), the process is completed uniformly.

  In FIG. 10, the moving image viewing mode is selected by the user at timing T0, and priority setting processing is executed by the task management unit 37A. The priority setting process executed at timing T0 will be described later. Also, in FIG. 10, at timing T20, another process (the operation mode is the moving image viewing mode and the time required for executing the process is 100 milliseconds) is started. In FIG. 10, at timing T190, the user selects the radio mode instead of the moving image viewing mode, and after the selection, the task management unit 37A executes priority setting processing. The priority setting process executed at timing T190 will be described later. As described above, in FIG. 10, the operation mode is the moving image viewing mode during the period from the timing T0 to T190, and the operation mode is the radio mode after the timing T190. Also, in FIG. 10, at timing T210, another process (the operation mode is the radio mode and the time required for the process is 20 milliseconds) is started.

  Other assumptions are the same as those in FIG.

  Now, as shown in FIG. 10, the database construction process is started at the timing T0. Further, as described above, at timing T0, the user selects the moving image viewing mode, and the task management unit 37A executes priority setting processing. In the priority setting process, the task management unit 37A executes the following process. That is, the task management unit 37A determines that the writing speed level is a high speed level, and gives a priority “low” as a provisional priority to the database construction task. Next, the task management unit 37A recognizes that the selected operation mode is the moving image viewing mode. Next, since the operation mode is the moving image viewing mode, the task management unit 37A predicts the other processing load level as the level “high”. Next, since the other processing load level is the level “high”, the task management unit 37A determines the provisional priority (priority “low”) as the final priority as it is.

  As shown in FIG. 10, during the period when the operation mode is the moving image viewing mode, the priority of the database construction task is lower than the priority of other processing tasks. As described above, the effect that the priority of the database construction task is lower than the priority of the other processing task when the writing speed level is the high speed level is as described in the first embodiment.

  As described above, at timing T190, the radio mode is selected by the user, and the priority setting process is executed by the task management unit 37A. In the priority setting process, the task management unit 37A executes the following process. That is, the task management unit 37A determines that the writing speed level is a high speed level, and gives a priority “low” as a provisional priority to the database construction task. Next, the task management unit 37A recognizes that the selected operation mode is the radio mode. Next, since the operation mode is the radio mode, the task management unit 37A predicts the other processing load level as the level “low”. Next, since the other processing load level is “low”, the task management unit 37A changes the provisional priority and sets the final priority to “high”.

  As shown in FIG. 10, during the period in which the operation mode is the radio mode, the priority of the database construction task is higher than the priority of other processing tasks even though the writing speed level is high. This point is different from the first embodiment. Thus, in the period in which the operation mode is the radio mode, the priority of the database construction task is higher than the priority of the other processing task. The delay caused by the higher priority of the construction task than that of the other processing task is small. Also, other processing that occurs when the operation mode is the radio mode is likely to have a small processing load.

  FIG. 11 shows a period in which the CPU 11 is assigned to the database construction task (= period of execution state) and a period in which the CPU 11 is assigned to the task related to the other process when other processes are performed in parallel with the database construction process. 4 is a time chart showing together with a period during which the memory control unit 32 performs a writing process. In FIG. 11, the axis J11A indicates the time period in which the CPU 11 is assigned to the other processing task in time series, the axis J11B indicates the time period in which the CPU 11 is assigned to the database construction task in time series, and the axis J11C performs the writing process. The period is shown in time series.

  FIG. 11 shows a case where the task management unit 37A determines that the writing speed level is a low speed level and gives a relatively higher priority to the database construction task as a provisional priority than other processing tasks. The period during which the CPU 11 is allocated to the database construction task and the other processing task is shown.

  FIG. 11 assumes the following. That is, during the period shown in FIG. 11, the task management unit 37A continues to determine the writing speed level as the low speed level, and gives the priority “high” as the provisional priority to the database construction task. In FIG. 11, the time required to write the database configuration data transferred to the memory control unit 32 in the database construction task in the memory 17 is “30 milliseconds”. In FIG. 11, the database construction process is started at the timing T0.

  In FIG. 11, the media mode is selected by the user at timing T0, and the priority setting process is executed by the task management unit 37A. The priority setting process executed at timing T0 will be described later. In FIG. 11, another process (the operation mode is the media mode and the time required for the process is 60 milliseconds) is started at timing T20. In FIG. 11, at timing T150, the user selects the moving image viewing mode instead of the media mode, and the task management unit 37A executes priority setting processing. The priority setting process executed at timing T150 will be described later. As described above, in FIG. 11, the operation mode is the media mode during the period from the timing T0 to T150, and after the timing T150, the operation mode is the moving image viewing mode. In FIG. 11, at timing T170, another process (the operation mode is the moving image viewing mode and the time required for the process is 100 milliseconds) is started.

  Other assumptions are the same as those in FIG.

  Now, as shown in FIG. 11, the database construction process is started at the timing T0. Further, as described above, at timing T0, the media mode is selected by the user, and the priority setting process is executed by the task management unit 37A. In the priority setting process, the task management unit 37A executes the following process. That is, the task management unit 37A determines that the writing speed level is a low speed level, and gives a priority “high” as a provisional priority to the database construction task. Next, the task management unit 37A recognizes that the selected operation mode is the media mode. Next, since the operation mode is the media mode, the task management unit 37A predicts the other processing load level as “medium”. Next, since the other processing load level is “medium”, the task management unit 37A determines the provisional priority (priority “high”) as the final priority as it is.

  As shown in FIG. 11, during the period when the operation mode is the media mode, the priority of the database construction task is higher than the priority of other processing tasks. As described above, the effect that the priority of the database construction task is higher than the priority of the other processing task when the writing speed level is the low speed level is as described in the first embodiment.

  As described above, the moving image viewing mode is selected by the user at the timing T150, and the priority setting process is executed by the task management unit 37A. In the priority setting process, the task management unit 37A executes the following process. That is, the task management unit 37A determines that the writing speed level is a low speed level, and gives a priority “high” as a provisional priority to the database construction task. Next, the task management unit 37A recognizes that the selected operation mode is the moving image viewing mode. Next, since the operation mode is the moving image viewing mode, the task management unit 37A predicts the other processing load level as the level “high”. Next, since the other processing load level is “high”, the task management unit 37A changes the provisional priority and sets the final priority to “low”.

  As shown in FIG. 11, during the period in which the operation mode is the video viewing mode, the priority of the database construction task is higher than the priority of the other processing tasks even though the writing speed level is the low speed level. Is also low. This point is different from the first embodiment. Thus, during the moving image viewing mode, the priority of the database construction task is lower than the priority of other processing tasks. The other processing that occurs during the period has a very large processing load, and the other processing is completed by effectively utilizing the fact that the priority of the database construction task is lower than the priority of the other processing task. Timing delay can be suppressed. Also, other processing that occurs when the operation mode is the moving image viewing mode is likely to have a large processing load.

  FIG. 12 is a flowchart illustrating an operation example of the task management unit 37A of the task management apparatus 100A according to the present embodiment. The task management unit 37A repeatedly executes the process shown in the flowchart of FIG. 12 at a predetermined cycle while the database construction process is being executed.

  As shown in the flowchart of FIG. 12, the task management unit 37A acquires the simultaneous access amount detected by the access amount detection unit 36 (step S11). Next, the task management unit 37A determines the level of the writing speed based on the simultaneous access amount acquired in step S11 (step S12). In step S12, the task management unit 37A determines that the level of the writing speed is the high speed level when the acquired simultaneous access amount is lower than the predetermined threshold value, and if it is equal to or higher than the predetermined threshold value, It is determined that the level is a low speed level.

  Next, the task management unit 37A recognizes the operation mode currently selected (step S13). Next, the task management unit 37A predicts the other processing load level according to the selected operation mode (step S14). Next, the task management unit 37A determines the provisional priority of the database construction task based on the writing speed level determined in step S12 (step S15). Next, the task management unit 37A adjusts the provisional priority based on the other processing load level predicted in step S14, and determines the final priority (step S16).

  As a result of the above processing, the priority of the database construction task is appropriately determined by reflecting the writing speed level and the predicted other processing load level.

(Third embodiment)
Next, 3rd Embodiment of this invention is described based on drawing. Note that in the following third embodiment, constituent elements corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 13 is a block diagram illustrating a functional configuration example of the task management apparatus 100B according to the present embodiment. As is clear from comparison between FIG. 13 and FIG. 2, the task management apparatus 100 </ b> B according to the present embodiment includes a task management unit 37 </ b> B instead of the task management unit 37, and the task management according to the first embodiment. The functional configuration of the apparatus 100 is different.

  In the first embodiment described above, the task management unit 37 uses the “write speed level” as a parameter to determine the priority of the database construction task. In the second embodiment described above, the task management unit 37A uses the “write speed level” and the “predicted processing load of other processing executed in parallel with the database construction processing” as parameters. The priority of the database construction task was determined.

  On the other hand, in the present embodiment, the task management unit 37B executes the following processing regarding the determination of the priority of the database construction task. That is, the task management unit 37B determines the priority of the database construction task using “the predicted processing load of other processing executed in parallel with the database construction processing”. Hereinafter, the processing of the task management unit 37B will be described in detail.

  While the database construction process is performed, the task management unit 37B executes the priority setting process described below at a predetermined cycle. That is, in the priority setting process, first, the task management unit 37B recognizes the operation mode currently selected. Next, the task management unit 37B predicts the other processing load level according to the selected operation mode. The task management unit 37B executes the prediction of the other processing load level by a method similar to the method described in the second embodiment.

  Next, the task management unit 37B lowers the priority of the database construction task as the predicted other processing load level increases. In other words, the task management unit 37B increases the priority of the database construction task as the predicted other processing load level is lower.

  For example, it is assumed that there are “high”, “medium”, and “low” in descending order of task priority, and the priority “medium” is always given to other processing tasks. In this case, when the predicted other processing load level is “high”, the task management unit 37B gives the priority “low” as the priority to the database construction task. On the other hand, when the predicted other processing load level is the level “low”, the task management unit 37B gives the priority “high” as the priority to the database construction task.

  As described above, in the present embodiment, the task management unit 37B determines the priority of the database construction task based on the predicted other processing load level without using the writing speed. The effect of lowering the priority of the database construction task as the predicted processing load is larger and increasing the priority of the database construction task as the predicted processing load is smaller is as described in the second embodiment. .

  FIG. 14 is a flowchart showing an operation example of the task management unit 37B of the task management apparatus 100B according to the present embodiment. The task management unit 37B repeatedly executes the process shown in the flowchart of FIG. 14 at a predetermined cycle while the database construction process is being executed.

  As shown in the flowchart of FIG. 14, the task management unit 37B recognizes the operation mode currently selected (step S21). Next, the task management unit 37B predicts another processing load level according to the operation mode recognized in step S21 (step S22). Next, the task management unit 37B determines the final priority based on the other processing load level predicted in step S22 (step S23). As described above, the task management unit 37 lowers the priority of the database construction task as the predicted processing load is larger, and increases the priority of the database construction task as the predicted processing load is smaller.

  As a result of the above processing, the priority of the database construction task is determined so that the priority of the database construction task becomes lower as the predicted processing load increases according to the currently selected operation mode. Fluctuates.

  In each embodiment mentioned above, task management devices 100, 100A, and 100B were applied to in-vehicle device 1 carried in vehicles. However, the task management devices 100, 100 </ b> A, and 100 </ b> B do not have to be devices that are applied to the in-vehicle device 1. That is, the present invention can be widely applied to apparatuses that construct a database based on information received from an external apparatus.

  Moreover, in each embodiment mentioned above, task management apparatus 100, 100A, 100B was the structure which receives music information as construction information from an external apparatus, and constructs music information database DB1 based on music information. In this regard, the information received by the task management apparatuses 100, 100A, and 100B for constructing the database need not be music information.

  The period during which the user cannot instruct the execution of other processes may be configured such that the priority of the database construction task is higher than the period during which the user can instruct the execution of other processes. For example, although the power to the in-vehicle device 1 including the task management device 100 is supplied from the accessory power supply, an image is not displayed on the display 200 for a predetermined period after the accessory power supply is turned on, and the user performs a touch operation. Various activation processes are performed in a state where no instruction can be given. This period is a period during which the user cannot instruct the execution of other processes. For this period, the priority of the database construction task is set higher than the period when the activation process ends and the user can instruct the execution of other processes. It is good also as a structure made high. That is, in addition to the parameters listed in the above-described embodiments, elements from outside the device that change the state of the in-vehicle device 1 (task management device 100) are used as parameters used when determining the priority of the database construction task. May be used.

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

11 CPU (second processing resource)
17 Memory (storage media)
18 Memory controller 31 Database construction unit 32 Memory control unit (write control unit)
33 Memory-related process execution part (other process execution part)
34 Media-related process execution part (other process execution part)
35 Radio-related process execution part (other process execution part)
37 Task management unit 100 Task management device DB1 Music information database (database)
KT mobile terminal (external device)

Claims (8)

A write controller that executes writing of the transferred data to the storage medium using the first processing resource;
A database construction process for generating a database based on construction information received from an external device and transferring data constituting the database to the write control unit is a second process different from the first processing resource. A database builder that uses resources to execute,
Using the second processing resource, another process execution unit that executes another process that is a process other than the database construction process;
While the database construction process is executed, the task related to the database construction process is assigned to the second processing resource and executed, and then the data transferred in the one task by the write control unit When the writing of is completed, while trying to allocate the next task related to the database construction process to the second processing resource,
A task management unit for determining a level of the writing speed of the writing control unit, and lowering a priority of assignment of the task related to the database construction processing to the second processing resource as the writing speed is higher; ,
A task management device comprising: The task management unit
The level of the writing speed is determined based on at least one of the simultaneous access amount to the storage medium, the type of the storage medium, the usage period of the storage medium, and the number of times of reading and writing to the storage medium. The task management apparatus according to claim 1. The task management unit
The task management apparatus according to claim 1, wherein the level of the writing speed is determined by actually measuring the writing speed of the writing control unit. The task management unit
Predict the processing load of the other processing executed in parallel with the database construction processing, and determine the priority determined based on the level of the writing speed of the write control unit, the higher the predicted processing load, the higher the priority The task management device according to claim 1, wherein the task management device is adjusted so as to be low. The other process is a process executed using the source selected by the user.
The task management unit
The task management apparatus according to claim 4, wherein a processing load of the other process executed in parallel with the database construction process is predicted based on a type of source selected by a user. The external device stores audio data in association with additional information configured to include a plurality of information,
The database construction department
6. The task management device according to claim 1, wherein the additional information is received from the external device as the construction information, and a database is generated based on the received additional information. Based on the write control unit that executes the writing of the transferred data to the storage medium using the first processing resource, and the construction information received from the external device, the database is created A database construction unit that executes database construction processing for transferring data to be configured to the write control unit using a second processing resource different from the first processing resource, and uses the second processing resource. Then, another process execution unit that executes other processes other than the database construction process and one task related to the database construction process as the second processing resource while the database construction process is executed When the writing of the data transferred in the one task by the write control unit is completed after being assigned and executed A task management method according to the task management device and a task management unit attempting to assignment to the second processing resources of the following tasks according to the database construction process,
A first step in which the task management unit of the task management device determines a write speed level of the write control unit;
The task management unit of the task management device includes a second step of lowering the priority of assignment of the task related to the database construction process to the second processing resource as the writing speed is higher. A featured task management method. Based on the write control unit that executes the writing of the transferred data to the storage medium using the first processing resource, and the construction information received from the external device, the database is created A database construction unit that executes database construction processing for transferring data to be configured to the write control unit using a second processing resource different from the first processing resource, and uses the second processing resource. A task management program that can be executed by a computer of a task management device that includes another process execution unit that executes other processes that are processes other than the database construction process,
The above computer
While the database construction process is executed, the task related to the database construction process is assigned to the second processing resource and executed, and then the data transferred in the one task by the write control unit Is completed, the next task related to the database construction process is attempted to be allocated to the second processing resource, while the write speed level of the write control unit is determined, and the write speed is A task management program that functions as a task management unit that lowers the priority of assignment of a task related to the database construction process to the second processing resource as the level becomes faster.