JP2010061253A - Memory management server and method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a memory management server and method, and a program, allowing high-speed retrieval by constructing, in a storage device of an application server, a shared memory area (a memory image file) holding a memory structure used by an application program. <P>SOLUTION: The memory management method has processes: for calculating size of data used in the application program; for securing the data used in the application program in a continuous internal memory area; for writing the data used in the application program into the continuous internal memory area; for performing memory mapping processing of the data written in the continuous internal memory area to an auxiliary storage device as the memory image file; and for synchronizing the data of the memory image file and the data of the memory image file. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a memory management server, a method, and a program. More specifically, the present invention relates to a server, a method, and a program for sharing a memory among application servers for each WEB application program.

  Generally, a database server is used when it is desired to refer to the same data for each request in a WEB application program.

  However, in the case of a WEB application program that requires higher speed, it is possible to avoid the overhead caused by the database server by storing (storing) the data on the shared memory of the WEB server and retrieving the data only by memory access. Yes (see, for example, Patent Document 1).

JP-A-6-67954

  If a shared memory by a semiconductor element on the WEB server is used, data can be accessed at a high speed. However, if the WEB application program generates a new process for each request, The shared memory cannot be used.

  Further, when the shared memory is used, the memory resources of the application server are consumed, so that a large amount of data cannot be stored (stored) in the shared memory.

  The present invention has been made in view of such a situation, and a shared memory area (memory image file) holding a memory structure used by an application program in a storage device of an application server such as an HDD (Hard Disc Drive) is provided. To provide a memory management server, a method, and a program capable of solving the above problem by constructing and referring to this area from a WEB application program, and enabling high-speed search by assuming a function as an alternative to a database server Objective.

  (1) A method for making it possible to use an auxiliary storage device as a shared memory from a plurality of applications, the step of securing a continuous internal memory area for the data used in an application program, A step of writing the data used in the application program in a continuous internal memory area; a step of performing a memory mapping process as a memory image file in the auxiliary storage device with the data written in the continuous internal memory area; Synchronizing the data of the memory and the data of the memory image file, wherein the data of the memory image file retains a memory structure of the memory area, and a plurality of the application programs are stored in the storage device. Memory image Memory management method is characterized by the sharing the file.

  According to the invention according to (1), in order to make it possible to use the auxiliary storage device as a shared memory from a plurality of applications, data used for the application program is written in a continuous memory area, and a continuous internal memory is used. A memory mapping process is performed on the data written in the memory area while maintaining the memory structure of the internal memory area, and a memory image file (also referred to as a memory map file) subjected to the memory mapping process is physically stored in an auxiliary storage device Performs synchronization (writes data) operation. Here, “auxiliary storage device” typically refers to a writable storage device or storage medium such as a hard disk provided in a computer device, but for comparison with “internal memory” (main memory). It does not necessarily mean that it is physically located inside or outside the computer apparatus housing.

  Thus, according to the invention according to (1), there is no transmission / reception via the communication line as compared with the case where the data used for the application program is stored in the database server connected via the network. High speed data retrieval is easily achieved.

  Compared to the case where the data is stored in the local storage unit of the application server in a state where no mapping process is performed, format conversion is not required in the present invention, so that the speed of data retrieval can be easily achieved. .

  Further, when data is stored in the main memory of the application server, it takes time to read the memory because the data stored in the local storage unit of the application server needs to be once read into the main memory when starting the application server. In the present invention, such waiting time is eliminated.

  Furthermore, since it is difficult to maintain a large capacity of the main memory because of the limitation of the price and mounting area in general, the use of a large amount of data in the data area may cause other programs to run slower. Although this occurs, the present invention does not cause such an adverse effect while maintaining a high search speed for data.

  Furthermore, according to the present invention, it is possible to create a configuration that does not depend on the environment by creating a memory image file corresponding to an OS (Operating System) or a development language.

  Since the shared memory area (memory image file) is stored in the storage device of the application server such as an HDD (Hard Disc Drive), data is not lost even if the WEB server goes down.

Even if the WEB application program generates a new process for each request, the data is stored as a memory image file, so that retrieval (access) is possible.
(2) The memory management method according to (1), wherein an arrangement order of the data in the internal memory area is the same as an arrangement order of the data in the memory image file of the auxiliary storage device.

  According to the invention according to (2), since the data of the memory image file created in (1) is the same as the order of the data in the internal memory area, it is handled as a single file by a plurality of application programs. Is possible.

  In this way, according to the invention according to (2), data used in one application program can be combined into one memory image file, so that data can be managed efficiently. It was.

  Even if the WEB application program generates a new process for each request, data can be retrieved (accessed) for each WEB application program because the data is stored as a memory image file. It becomes.

  (3) The application program is a WEB application program, and the auxiliary storage device is a storage device in a WEB application server on which the WEB application program operates. (1) or (2) Memory management method.

  According to the invention according to (3), data desired to be used in the WEB application is filed with the same image as that stored in the memory and stored in a storage device such as an HDD.

  Thus, according to the invention according to (3), since the memory image file that is the shared memory area exists in the storage device such as the HDD, data is not lost even if the WEB server goes down.

  (4) The memory image file is read-only, and when the data content of the memory image file is changed, the entire memory image file is replaced. The memory management method according to one item.

  Thus, according to the invention according to (4), when the contents of the memory image file are changed, the data can be updated only by replacing the memory image file.

  (5) A memory management server device for enabling an auxiliary storage device to be used as a shared memory from a plurality of applications, and for storing a continuous internal memory area for the data used in the application program Area allocation means, data writing means for writing the data used in the application program in the continuous internal memory area, and memory mapping as a memory image file for the data written in the continuous area in an auxiliary storage device Memory mapping means for processing; and synchronization means for synchronizing the data of the internal memory and the data of the memory image file, wherein the data of the memory image file holds a memory structure of the internal memory area, Application Down program, memory management server apparatus characterized by sharing the memory image file of the auxiliary storage device.

  According to the invention according to (5), in order to make it possible to use the auxiliary storage device as a shared memory from a plurality of applications, the data used for the application program is written to the continuous internal memory area and continuously The memory mapping process is performed on the data written in the internal memory area, and the memory image file subjected to the memory mapping process is synchronized with the storage device that physically exists (data is written). The definition of “auxiliary storage device” is the same as that described in (1).

  In this way, according to the invention according to (5), since data used for the application program is stored in the database server, there is no transmission / reception via the communication line, so the data search can be speeded up easily. To be achieved.

  Further, compared to the case where data is stored in the local storage unit of the application server in a state where mapping processing is not performed, in the present invention, format conversion is not required, so that data search can be easily speeded up.

  Further, when data is stored in the main memory of the application server, it takes time to read the memory because the data stored in the local storage unit of the application server needs to be once read into the main memory when starting the application server. In the present invention, such a waiting time is eliminated.

  Furthermore, since it is difficult to maintain a large capacity of the main memory because of the limitation of the price and mounting area in general, the use of a large amount of data in the data area may cause other programs to run slower. Although it occurs, the present invention does not cause such an adverse effect while maintaining a high search speed for data.

  Further, according to the present invention, it is possible to make a configuration independent of the environment by creating a memory image file corresponding to the OS or the development language.

  Since the shared memory area (memory image file) is stored in the storage device of the application server such as the HDD, data is not lost even if the WEB server goes down.

  Even if the WEB application program generates a new process for each request, the data is stored as a memory image file, so that retrieval (access) is possible.

  (6) A program that causes a computer to execute the method according to any one of (1) to (4).

  According to such a configuration, the same effect as in (5) can be expected by causing the computer to execute the program.

  According to the present invention, as compared with the case where data used for an application program is stored in the database server, there is no transmission / reception via the communication line, so that the speed of data retrieval can be easily achieved.

  Further, compared to the case where data is stored in the local storage unit of the application server in a state where mapping processing is not performed, in the present invention, format conversion is not required, so that data search can be easily speeded up.

  Further, when data is stored in the main memory of the application server, it takes time to read the memory because the data stored in the local storage unit of the application server needs to be once read into the main memory when starting the application server. In the present invention, such a waiting time is eliminated.

  Furthermore, since it is difficult to maintain a large capacity of the main memory because of the limitation of the price and mounting area in general, the use of a large amount of data in the data area may cause other programs to run slower. Although this occurs, the present invention does not cause such an adverse effect while maintaining a high search speed for data.

  Furthermore, according to the present invention, it is possible to create a configuration that does not depend on the environment by creating a memory image file corresponding to an OS (Operating System) or a development language.

  Since the shared memory area (memory image file) is stored in the storage device of the application server such as an HDD (Hard Disc Drive), data is not lost even if the WEB server goes down.

  Further, even when the data content is changed, it is possible to easily cope with the replacement of the memory image file.

  Even if the WEB application program generates a new process for each request, the data is stored as a memory image file, so that retrieval (access) is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Entire system configuration]
FIG. 1 shows an information processing system 1 including a memory management server (application server) 10 and a user terminal 30 according to the present embodiment. In FIG. 1, the information processing system 1 is shown with one memory management server 10 and one user terminal 30. However, the information processing system 1 is not limited to this, and may be configured with a plurality of each.

  As shown in FIG. 2, the memory management server 10 includes a CPU (Central Processing Unit) 310 (a plurality of CPUs such as a CPU 320 may be added in a multiprocessor configuration), a bus line 200, and a communication I. / F (I / F: interface) 330, main memory 340, BIOS (Basic Input Output System) 350, I / O controller 360, hard disk 370, optical disk drive 380, and semiconductor memory 390. The hard disk 370, the optical disk drive 380, and the semiconductor memory 390 are collectively referred to as a storage device 410.

  The control unit 300 is a part that controls the memory management server 10 in an integrated manner. By appropriately reading and executing various programs stored in the hard disk 370, the control unit 300 cooperates with the hardware described above, and performs various types according to the present invention. The function is realized.

  The communication I / F 330 is a network adapter when the memory management server 10 transmits / receives information to / from other devices such as the user terminal 30 via the network.

  The BIOS 350 records a boot program executed by the CPU 310 when the memory management server 10 is started, a program depending on the hardware of the memory management server 10, and the like.

  A storage device 410 such as a hard disk 370, an optical disk drive 380, and a semiconductor memory 390 can be connected to the I / O controller 360.

  The hard disk 370 stores various programs for causing the hardware to function as the memory management server 10, a program for executing the functions of the present invention, a table to be described later, and the like. Note that the memory management server 10 can also use an external hard disk (not shown) as an auxiliary storage device.

  As the optical disk drive 380, for example, a DVD-ROM drive, a CD-ROM drive, a DVD-RAM drive, or a CD-RAM drive can be used. In this case, the optical disk 400 corresponding to each drive is used. A program or data can be read from the optical disk 400 by the optical disk drive 380 and provided to the main memory 340 or the hard disk 370 via the I / O controller 360.

  Note that the computer in the present invention refers to an information processing apparatus including a storage device, a control unit, and the like, and the memory management server 10 includes an information processing device including a storage device 410, a control unit 300, and the like.

  In addition, the memory management server 10 according to the present invention has the above-described configuration, and performs memory mapping processing using data used in the application program as a memory image file, and stores the memory image file in the memory management server 10. Writes and synchronizes as a memory image file to the device 410, and the memory image file data has the function of sharing the memory image file of the storage device 410 while maintaining the memory structure of the main memory 340. ing.

  Here, a configuration for exhibiting the function will be described with reference to a functional block diagram shown in FIG. The memory management server 10 includes a data operation unit 11 as a data operation unit, a storage area reservation unit 12 as a storage area reservation unit, a data write unit 13 as a data write unit, and a memory as a memory mapping processing unit. The mapping unit 14 includes a synchronization unit 15 as a synchronization unit, a memory image file storage unit 16 that stores a memory image file, and an internal memory 17 that reads and writes data before and after the memory mapping process.

  The data calculation unit 11 has a function of calculating the size of data used in the application program.

  In order to secure the necessary area in the memory image file, it is necessary to calculate the size of the data.

  There are cases where a plurality of different application programs are operating on the memory management server 10, and in this case, the size of data used for each application program is calculated. Since a memory image file is formed for each application program, there may be a plurality of memory image files (also referred to as memory map files) shared by a plurality of application programs.

  For example, in the case of C language, the size of data used in the application program can be calculated by using a sizeof () function. In addition, in a normal file IO, an area is automatically secured when writing is performed, so it may not be necessary to secure an area in advance. For example, an IO using mmap has a read / write size. It is necessary to set in advance, and the size needs to be passed as an argument of the mmap function.

  The storage area securing unit 12 has a function of securing the data used in the application program in a continuous storage area.

  The reason why the continuous area is secured is to match the required size (size) of the file to be mapped with the size actually used as data.

  Ensuring a continuous area can be realized by temporarily using the internal memory 17.

  The data writing unit 13 has a function of writing data used in the application program in a continuous internal memory area.

  This is because it is necessary to write data to the map file before performing the mapping process.

  As an example, in the case of C language, read (fd, & c, size of (char)) function reads the number of bytes of size of (char) from address & c, and write (fd, & c, size of (char)) function , Sizeof (char) byte data can be written from the address & c.

  The memory mapping unit 14 has a function of performing memory mapping processing on the data written in the continuous internal memory area as a memory image file.

  As an example, in the case of C language, the memory mapping process can be executed with mmap (0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0).

  In the formula, since the first argument is “0”, the kernel selects the start address of the new mapping. This method is the most portable new mapping method.

  PROT_READ allows the page to be readable, PROT_WRITE allows the page to be writable, and MAP_SHARED allows the mapping to be shared.

  However, writing permits rewriting of the entire file (replacement of the file), and writing of only a part of the file is not permitted.

  The synchronization unit 15 has a function of synchronizing the memory image file as a memory image file with the storage device (memory image file storage unit 16).

  The data in the internal memory is synchronized with the memory image file storage unit 16 on the physical storage area such as on the hard disk.

  That is, since the memory structure is written in the memory image file storage unit 16 while maintaining the (data) structure (memory structure) of the memory image file expanded in the internal memory 17, a plurality of applications can be stored in the internal memory 17. The memory image file in the memory image file storage unit 16 can be shared while maintaining the memory structure.

  In this case, the arrangement order of the data in the internal memory 17 and the data in the memory image file is the same.

  As an example, in the case of the C language, the mssync (ptr, size, 0) function can be used to actually write and synchronize with the memory image file. In this case, data corresponding to the memory area of length “size” starting from ptr is stored in the storage device 410 such as an HDD. Finally, the file is closed (close (fd)).

  According to such a configuration, the size of data used for the application program is calculated, the data used for the application program is written to the continuous internal memory area, and the data written to the continuous internal memory area is stored in the memory. Since the mapping process is performed and the memory image file subjected to the memory mapping process is synchronized (written) with a storage device that physically exists, the data of the memory image file retains the memory structure of the main memory 340. A plurality of application programs can share the memory image file in the storage device 410.

  Therefore, in the storage device of the application server, the memory area in which the data used by the application program is stored can be handled as a single file (data saved while retaining the memory structure). It is possible to share these data, and by referring to this area from the WEB application program, it is possible to perform high-speed search by assuming a function as an alternative to the database server.

[Processing procedure]
Here, a specific processing procedure that can be realized when the present invention is applied will be described with reference to a flowchart (when C language is used) shown in FIG. The processing procedure shown below is an example, and there are innumerable processing procedures that can be realized in addition to this.

  In step S1, the memory management server 10 opens a map file. For example, when the map file name is “MapFile”, the map file can be opened with open (“MapFile”, O_RDWR | O_CREATE, 0666).

  In step S2, the data calculation unit 11 of the memory management server 10 calculates the size of data used for the application program for each application program, and sets the size as the size of the map file area.

  In step S3, the storage area securing unit 12 of the memory management server 10 secures a memory area on the internal memory 17 corresponding to the data size calculated in step S2.

  In step S4, the data writing unit 13 of the memory management server 10 writes data used in the application program in the map file secured in step S3.

  For example, in the case of C language, read (fd, & c, sizeof (char)) function is used to read the number of bytes of sizeof (char) from address & c (read data used in the application), and write (fd , & C, sizeof (char)) function, it is possible to write the data of the number of bytes of sizeof (char) from the address & c.

  In step S5, the memory mapping unit 14 of the memory management server 10 performs memory mapping processing using the data written in the continuous internal memory area in step S4 as a memory image file.

  As an example, in the case of C language, the memory mapping process can be executed with mmap (0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0).

  In step S6, the synchronization unit 15 of the memory management server 10 writes and synchronizes the memory image file to the storage device (memory image file storage unit 16).

  That is, while maintaining the (data) structure (memory structure) of the memory image file developed in the internal memory 17, the memory structure is written into the memory image file storage unit 16 and synchronized.

  As an example, in the case of C language, write synchronization can be achieved by using an mssync (ptr, size, 0) function. Then, the file is closed (close (fd)).

  In step S <b> 7, when a user calls an application program existing in the memory management server 10 using the user terminal 30 and executes an application, a request request is generated for data used for the application program.

  In step S8, the control unit 300 of the memory management server 10 starts from the memory image file stored in the memory image file storage unit 16 in the memory management server 10 prepared for each application program whose data is requested in step S7. Read data.

  According to such a configuration, the size of data used for the application program is calculated, the data used for the application program is written to the continuous internal memory area, and the data written to the continuous internal memory area is stored in the memory. Since the mapping process is performed and the memory image file subjected to the memory mapping process is synchronized with the storage device that physically exists (data is written), the memory image file data retains the memory structure of the main memory 340. Thus, a plurality of application programs can share the memory image file in the storage device 410.

  Therefore, in the storage device of the application server, the memory area in which the data used by the application program is stored can be handled as a single file (data saved while retaining the memory structure). It is possible to share these data, and by referring to this area from the WEB application program, it is possible to perform high-speed search by assuming a function as an alternative to the database server.

[Overall configuration concept]
A conceptual diagram of the overall configuration is shown in FIG.
When application (program) 1, application (program) 2 and application (program) 3 are mounted on memory management server 10, they are used for application (program) 1, application (program) 2 and application (program) 3. The stored data 18 is stored in the storage portion of the main memory 340.

  In the present embodiment, the data calculation unit 11, the storage area securing unit 12, the data writing unit 13, the memory mapping unit 14, and the synchronization unit 15 of the control unit 300 execute the memory mapping process 19.

  Data 18 is divided and processed for each data used by each application (program) by the memory mapping process 19.

  That is, the data for application 1 is stored in the memory image file storage unit 16 in a form in which one file is handled as a memory area as the memory image file 16a for application 1.

  Similarly, the data for the application 2 is stored in the memory image file storage unit 16 in a form in which one file is handled as a memory area as the memory image file 16b for the application 2.

  Similarly, the data for the application 3 is stored in the memory image file storage unit 16 in a form in which one file is handled as a memory area as the memory image file 16c for the application 3.

  When the user using the user terminal 30a is executing the application 1 installed in the memory management server 10, when the application 1 uses data for the application 1, the memory image file storage unit 16 The memory image file for application 1 16a stored in is retrieved, data is acquired, and execution of the application 1 is continued.

  Further, when the user using the user terminal 30a is executing the application 2 installed in the memory management server 10, when the application 2 uses the data for the application 2, the memory image file storage is performed. The memory image file 16b for application 2 stored in the unit 16 is searched, data is acquired, and execution of the application 1 is continued.

  Similarly, when the user using the user terminal 30c is executing the application 1 installed in the memory management server 10, if the application 1 uses the data for the application 1, the memory image file is stored. The memory image file for application 1 16a stored in the unit 16 is searched, data is acquired, and the execution of the application 1 is continued.

  Similarly, when the user using the user terminal 30c is executing the application 2 installed in the memory management server 10, when the application 2 uses the data for the application 2, the memory The application 2 memory image file 16b stored in the image file storage unit 16 is searched, data is acquired, and execution of the application 1 is continued.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  In the present embodiment, the memory management server 10 has been described as having a hard disk 370 and an optical disk drive 380. However, the present invention is not limited to this, and a configuration without these drive systems, a so-called zero spindle configuration. May be. In the case of such a configuration, the contents stored in the hard disk 370 are stored in the large-capacity semiconductor memory 390.

It is a figure which shows the information processing system comprised from the server which concerns on this embodiment, and a user terminal. It is a block diagram which shows the structure of the server which concerns on this invention. It is a functional block diagram which shows the functional structure of the server which concerns on this embodiment. It is a flowchart with which it uses for description about the process sequence by the server which concerns on this embodiment. It is a figure which shows the concept of the whole structure which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information processing system 10 Memory management server 11 Data operation part 12 Storage area reservation part 13 Data writing part 14 Memory mapping part 15 Synchronization part 16 Memory image file storage part 17 Internal memory 30 User terminal

Claims (6)

A method for enabling an auxiliary storage device to be used as a shared memory from a plurality of applications,
Securing the data used in the application program in a continuous internal memory area;
Writing the data used in the application program in the continuous internal memory area;
A memory mapping process as a memory image file for the data written in the continuous internal memory area in an auxiliary storage device;
Synchronizing the data of the internal memory area and the data of the memory image file of the auxiliary storage device;
Including
The memory management method, wherein the data of the memory image file retains a memory structure of the internal memory area, and a plurality of application programs share the memory image file of the auxiliary storage device.   2. The memory management method according to claim 1, wherein the order of data in the internal memory area is the same as the order of data in the memory image file in the auxiliary storage device.   3. The memory management method according to claim 1, wherein the application program is a WEB application program, and the auxiliary storage device is a storage device in a WEB application server on which the WEB application program operates.   4. The memory according to claim 1, wherein the memory image file is read-only, and when the data content of the memory image file is changed, the entire memory image file is replaced. 5. Management method. A memory management server device that enables an auxiliary storage device to be used as a shared memory from a plurality of applications,
Storage area securing means for securing data used in the application program in a continuous internal memory area;
Data writing means for writing the data used in the application program to the continuous internal memory area;
Memory mapping means for performing memory mapping processing on the auxiliary storage device as a memory image file for the data written in the continuous internal memory area;
Synchronization means for synchronizing the data of the internal memory area and the data of the memory image file of the auxiliary storage device;
With
The memory management server device, wherein the data of the memory image file retains a memory structure of the internal memory area, and a plurality of application programs share the memory image file of the auxiliary storage device.   A program for causing a computer to execute the method according to any one of claims 1 to 4.

Images