JP2013171545A - Thin client system, server and client - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin client system for achieving the convenience of a user by shortening a time since the user actually performs an operation until the plotting of a screen is completed.SOLUTION: When one condition among one or more duplication conditions is satisfied by the state of the desktop of a client 20, virtual machine duplication processing S108 of a server 10 creates speculative execution processing S107 as a duplication of virtual machine processing S106. Assuming that an operation set for each condition is actually executed, speculative execution environment desktop processing S113 performs the speculative execution of the operation of a desktop. Screen transfer processing S105 transmits screen data after the speculative operation to the client 20. The transmitted screen data are buffered in a buffer part 203 of the client 20. When the operation is actually executed by the client 20, input/output control processing S202 instantaneously reflects the buffered screen data on a screen part 204.

Description

  The present invention relates to a method for improving the perceived speed of a user who uses a thin client system.

  A thin client is a diskless client that does not store application software and important data as much as possible. It has only the minimum necessary functions, and the application accesses the server via the network and executes it. It is normal to take

  The thin client system includes a CPU, a memory, a server on which computer resources such as a hard disk are mounted, and a client that has the minimum necessary computer resources and is connected to the server via a network. An image transfer method is common in a thin client system. The image transfer method is a method in which input information of keyboard and mouse operations performed at the client is sent to the server, the application is executed and data is stored based on the input information, and the execution screen data is sent to the client. The client is equipped with minimum computer resources and the like necessary for receiving and transmitting input information accompanying operations and processing screen data sent from the server.

  The server environment includes a real hardware method and a virtual hardware method. The actual hardware method is a method in which one server as an application execution environment physically exists for each client. In the virtual hardware method, a server that is an application execution environment is logically one for each client as in the real hardware method, but in reality there is one physical hardware. In this method, a number of virtual hardwares are virtually started and each user accesses the virtual hardware from a client.

  In the case of the virtual hardware method, because there is physically only one server for multiple clients, settings such as patch application and security policy can be processed all at once, and the latest software can be automatically Installation and automatic backup can greatly reduce the operational management burden. In addition, if a failure occurs in virtual hardware, the virtual hardware can be started anew and processing can be continued without performing physical hardware replacement. Can be minimized.

  In a thin client environment, the user's perceived speed may decrease because it generally takes a long time from a request to a response due to restrictions on the network capacity between the server and the client and communication overhead. The decrease in the experience speed significantly hinders the convenience for the user. Note that the bodily sensation speed refers to a speed that the user feels subjectively after the user provides input information at the client terminal until the server returns screen data to the client.

  There are Patent Literature 1, Patent Literature 2, and Patent Literature 3 as techniques for improving the perceived speed of a thin client environment user.

  Japanese Patent Application Laid-Open No. 2004-228561 improves the response speed of a GUI (Graphical User Interface) by significantly reducing the amount of data of a drawing data sequence transmitted and received between a server and a client without increasing the load on the client side. A remote desktop system server device and a client device that are capable of providing a technology are disclosed.

  In Patent Document 2, each computer that performs communication can acquire a communication status and a data communication rate. When communicating with each other, a desktop screen is obtained by changing information to be transferred using the information. In the case of transmitting / receiving such data, there is disclosed a technology that enables sharing so as not to impair user convenience.

  In Patent Document 3, if a prefetch instruction is specified for a screen on which a link is set, data necessary to display the screen is stored in a cache memory. Thus, when this screen is displayed, a technique is disclosed in which necessary data is read from the cache memory and a technique for shortening the time from the display request to the display is applied.

JP 2007-226635 A (paragraph 0049) JP 2004-355303 A (paragraph 0005) JP 2000-57078 A (paragraph 0016)

  However, in the thin client environment, the input information given to the client terminal reaches the server via the network, and the time until the screen data processed by the server reaches the client terminal again via the network and is displayed is It depends not only on the amount of data and communication capacity, but also on the distance of the communication path between the server and the client. That is, if the communication path between the server and the client is long, there is a problem that the time from when the user actually operates until the result is displayed on the screen becomes long, and the sensation speed decreases.

  For example, if the server is installed in Japan and the client terminal is used in a location directly behind the earth from Japan, the above calculation is based on the speed of light even if the server and the client terminal are directly connected by an optical fiber cable. The time is about 0.1 seconds. Actually, the communication path is complicated, such as via a router instead of being directly connected by an optical fiber cable, and the above time is longer than 0.1 seconds. This problem cannot be solved in any of Patent Documents 1 to 3. Therefore, there is a demand for a technique for further improving the sensation speed.

  The present invention is an invention for solving the above-mentioned problem, and when the communication path between the server and the client is long, the time from when the user actually operates until the drawing of the screen is completed. An object of the present invention is to provide a thin client system, a server, and a client that can be shortened and improve user convenience.

  In order to achieve the above object, in the present invention, the server environment is assumed to be a virtual hardware system, and includes a virtual machine environment and a speculative execution environment. In the present invention, speculative execution refers to pre-execution assuming a branch destination process when a program branches conditionally on the way.

  When the desktop state of the client satisfies one of the one or more replication conditions (for example, the mouse cursor is on a clickable part), the virtual machine replication process of the server is the virtual machine process ( For example, a speculative execution process (for example, speculative execution process S107) is created as a copy of the virtual machine process S106). The speculative execution environment desktop process of the created speculative execution process speculatively executes the operation of the desktop, assuming that an operation set for each condition (for example, executing a click) is actually performed. In the screen transfer process, transmission of the screen data after the execution of the operation to the client is started. The transmitted screen data is buffered in the client buffer. When the operation is actually executed by the client, the input / output control process immediately reflects the buffered screen data on the screen unit.

  At the same time, the server treats the created speculative execution process as a virtual machine process and continues the subsequent processes. If the operation is not executed, the virtual machine discarding process treats the replication source virtual machine process as a virtual machine process and continues the subsequent processes. As described above, the operation result is immediately reflected on the screen of the client without waiting for the time required for the transmission of the operation state to the server and the reception of the screen data after the operation from the server after the user's operation is performed. be able to. As a result, when the communication path between the server and the client is long, the time from when the user actually performs the operation until the result is displayed on the screen can be shortened.

  ADVANTAGE OF THE INVENTION According to this invention, a user's experience speed can be improved and a user's convenience can be improved.

It is a figure which shows the structure of the thin client system which concerns on embodiment of this invention. It is a figure which shows the hardware constitutions of a server. It is a figure which shows the hardware constitutions of a client. It is a figure which illustrates the data structure of the replication condition table of a user registered in the determination information storage part, and a discard condition table. 6 is a flowchart illustrating an input / output control process when image data is received. 6 is a flowchart illustrating an input / output control process when input information is received. It is a flowchart which illustrates an input transfer process. It is a flowchart which illustrates a screen transfer process. It is a flowchart which illustrates a virtual machine process. It is a flowchart which illustrates a virtual machine environment desktop process. It is a flowchart which illustrates a virtual machine environment duplication determination process. It is a flowchart which illustrates a virtual machine environment destruction determination process. It is a flowchart which illustrates speculation execution environment desktop processing. It is a flowchart which illustrates a virtual machine replication process. It is a flowchart which illustrates a virtual machine destruction process. It is a flowchart which illustrates a replication condition determination program code execution process. It is a flowchart which illustrates a virtual machine process destruction condition determination program code execution process. It is a flowchart which illustrates a speculative execution process discard condition determination program code execution process. It is a figure which shows the structure of a thin client system in case a speculative execution process performs a process as a virtual machine process. It is a figure which shows an example of the transition screen of a client.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a thin client system according to an embodiment of the present invention. The thin client system includes a server 10 and a client 20, and the server 10 and the client 20 are connected via a network.

  First, an outline of processing in the present invention will be described with reference to FIG. FIG. 20 is a diagram illustrating an example of a client transition screen. FIG. 20A is a screen example on the desktop of the client 20. A user (user) who uses the client 20 uses an input device such as a mouse among [Next], [Back], and [Detail Display] which are software buttons displayed in the window, and clicks [Next]. ] Is pressed, the next screen in FIG. 20B is displayed. When the user presses [Register] among the [Register] and [Return] buttons that are software buttons displayed in the window shown in FIG. 20B, the registration completion screen in FIG. 20C is displayed. Is displayed.

  The user may move the mouse pointer (arrow) while viewing the screen displayed on the desktop. At this time, for example, in FIG. 20A, when the pointer is placed on [Next], the server 10 side prepares a screen to be displayed when [Next] is pressed, and on the client 20 side. Send it. Thereafter, when the user presses “Next”, the client 20 can immediately display the screen stored in the buffer unit 203. Thus, according to the present invention, it is possible to improve the user's experience speed and improve the convenience of the user.

The processing contents for improving the user's sensation speed are as follows.
Process S <b> 1: The server 10 receives pointer input information from the client 20. As input information, for example, a message representing a vector value (two combinations representing x-axis increment and y-axis increment) representing a moving distance of the mouse of the client 20 for 1 millisecond, and a keystroke is made on the keyboard of the client 20 There is a message indicating the character code of the key.

  Process S2: The server 10 determines whether or not the input information of the pointer satisfies the predetermined condition in the virtual machine process based on the received input information, and the server 10 satisfies the predetermined condition (for example, In the case of FIG. 20A, the server 10 creates a speculative execution process S107 (a duplicate virtual machine of the client 20) as a duplicate of the virtual machine process S106 (a virtual machine of the client 20). Then, in the speculative execution process S107, the server 10 executes the program code for performing the click operation (pressing operation) with the current pointer ([Next] button), and creates the screen data of FIG.

  Process S3: The server 10 attaches the discard condition determination program code to the created screen data of FIG. The screen data represents, for example, the color of each pixel when the screen displayed on a device such as a liquid crystal display is imaged by dividing it into a preset resolution (for example, 1024 pixels by 768 pixels). This is image data representing a vector value (a combination of three numbers each representing a red component, a blue component, and a green component).

  Process S4: The client 20 receives the screen data of FIG. 20B, stores it in the buffer unit, and executes the received discard condition determination program code. When the client clicks the [Next] button in the state of FIG. 20A, the client 20 reflects the screen data of FIG. 20B stored in the buffer unit on the screen unit. When the pointer is removed from the [Next] button in the state of FIG. 20A, the client 20 discards the screen data of FIG. 20B stored in the buffer unit.

Process S5: In parallel with process S4, the server 10 executes the discard condition program code. When the [Next] button is clicked in the state of FIG. 20A, the speculative execution processing S107 is set as the virtual machine processing S106A (see FIG. 19) and the subsequent processing is continued. When the pointer is removed from the [Next] button, the original virtual machine process S106 is continued.
Thereafter, the processes S1 to S5 are repeated.

Returning to FIG. 1, a system configuration for realizing the processing contents will be described.
The server 10 includes a communication unit 101, a virtual machine management unit 102, and a determination information storage unit 103. The communication unit 101 transmits screen data from the server 10 to the client 20 and receives input information transmitted from the client 20 to the server 10.

  The determination information storage unit 103 includes a replication condition table 116 (see FIG. 4) and a discard condition table 117 (see FIG. 4). Reading or changing the data held in the replication condition table 116 and the destruction condition table 117 is performed by sending a message of a relational database operation from the virtual machine environment replication determination process S111 or the virtual machine environment destruction determination process S112. Done.

  The virtual machine management unit 102 includes an input transfer process S104, a screen transfer process S105, a virtual machine process S106 for each client 20, a speculative execution process S107 that is a duplicate of the virtual machine process S106 for each client 20, a virtual machine replication process S108, And a virtual machine discarding process S109. The relationship between the virtual machine process S106 and the speculative execution process S107 will be described later.

  As described above, in the case of the virtual hardware method, the execution environment of the client 20 is developed on the virtualization software, so that there is physically one-to-one. Image information is transferred from the virtual server, which is virtual hardware, to the client 20 using a remote desktop or the like.

(Input transfer processing S104)
The input transfer process S104 transmits the input information received from the client 20 by the communication unit 101 to the virtual machine environment desktop process S110 included in the virtual machine process S106. The input transfer process S104 transmits the program code transmitted from the virtual machine duplication process S108 to the speculative execution environment desktop process S113 included in the speculative execution process S107.

(Screen transfer process S105)
The screen transfer process S105 receives screen data from the virtual machine environment desktop process S110 included in the virtual machine process S106. The screen transfer process S105 receives screen data from the speculative execution environment desktop process S113 included in the speculative execution process S107. The screen transfer process S105 receives an instruction to attach the program code to the screen data from the virtual machine duplication process S108. Next, the screen transfer process S105 transmits the received screen data and program code to the communication unit 101.

(Virtual machine process S106)
The virtual machine process S106 includes a virtual machine environment desktop process S110, a virtual machine environment duplication determination process S111, and a virtual machine environment discard determination process S112.

  The virtual machine environment desktop process S110 receives input information from the input transfer process S104. The virtual machine environment desktop process S110 transfers the input information to the operating system executed by the virtual machine process S106. In addition, the virtual machine environment desktop process S110 transmits screen data generated by the operating system executed by the virtual machine process S106 to the screen transfer process S105.

  In the virtual machine environment duplication determination process S111, whether or not the internal state of the virtual machine process S106 corresponds to a condition for duplicating the virtual machine process S106 as a speculative execution process from the duplication condition table 116 included in the judgment information storage unit 103 is determined. The replication condition determination program code 11611 (refer to FIG. 4) for determining whether or not, and the replication execution program code 11612 (refer to FIG. 4) executed in the replication destination environment when the replication is executed are read.

  The virtual machine environment discard determination process S112 is a virtual process for determining whether or not the input operation executed on the client corresponds to a condition for discarding the virtual machine process executed on the server from the discard condition table 117. Machine process discard condition determination program code 11711 (see FIG. 4) and speculative execution process discard condition determination for determining whether or not the operation corresponds to a condition for discarding the speculative execution process executed on the server. The program code 11712 (see FIG. 4) is read.

  Next, the virtual machine environment replication determination process S111 executes the read replication condition determination program code 11611 to determine whether or not to execute replication. When the situation corresponds to the conditions for performing replication, the virtual machine replication process S108 includes a replication execution program code 11612, a virtual machine process discard condition determination program code 11711, and a speculative execution process discard condition determination program code 11712. In addition, a message requesting replication generation is transmitted.

  The virtual machine environment destruction determination process S112 determines whether or not to send a message requesting destruction to the virtual machine destruction process S109 from the destruction condition table 117 of the determination information storage unit 103 (see FIG. 4). Is read. The discard flag 1172 is registered as 0 when the condition for discarding the virtual machine process is satisfied, and 1 when the condition for discarding the speculative execution process is satisfied.

  Next, if the read discard flag 1172 is 0, the virtual machine environment discard determination process S112 transmits a message requesting the virtual machine process S106 to discard the virtual machine process S106. When the virtual machine process S106 is discarded, the speculative execution process S107 is treated as the virtual machine process S106A (see FIG. 19), and the subsequent processes are continued.

  FIG. 19 is a diagram illustrating a configuration of a thin client system when the speculative execution process executes a process as a virtual machine process. The speculative execution environment desktop process S113 is processed as a virtual machine environment desktop process S110, the speculative execution environment replication determination process S114 is processed as a virtual machine environment replication determination process S111, and the speculative execution environment destruction determination process S115 is processed as a virtual machine environment destruction determination process S112. .

  Returning to FIG. 1, when the read discard flag 1172 (see FIG. 4) is 1, the virtual machine environment discard determination process S112 transmits a message requesting the discard of the speculative execution process S107 to the virtual machine discard process S109. When the speculative execution process S107 is discarded, the replication source virtual machine process S106 is treated as the virtual machine process S106 and the subsequent processes are continued.

(Speculation execution process S107)
The speculative execution process S107 includes a speculative execution environment desktop process S113, a speculative execution environment duplication determination process S114, and a speculative execution environment discard determination process S115.

  The speculative execution environment desktop process S113 receives the copy execution program code 11612 (see FIG. 4) from the input transfer process S104. The speculative execution environment desktop process S113 executes the received duplication execution program code 11612 (see FIG. 4). The speculative execution environment desktop process S113 transmits the screen data generated by the copy execution program code 11612 executed by the speculative execution process S107 to the screen transfer process S105.

  In the speculative execution environment duplication determination process S114, as shown in FIG. 19, the internal state of the virtual machine process S106A should be duplicated using the virtual machine process S106A as a speculative execution process from the duplication condition table 116 of the decision information storage unit 103. A copy condition determination program code 11611 (see FIG. 4) for determining whether or not a condition is met, and a copy execution program code 11612 (FIG. 4) executed in the copy destination environment when the copy is executed. Read).

  The speculative execution environment discard determination process S115 is a virtual process for determining whether or not the input operation executed on the client corresponds to a condition for discarding the virtual machine process executed on the server from the discard condition table 117. Machine process discard condition determination program code 11711 (see FIG. 4) and speculative execution process discard condition determination for determining whether or not the operation corresponds to a condition for discarding the speculative execution process executed on the server. The program code 11712 (see FIG. 4) is read.

  Next, the speculative execution environment duplication determination process S114 executes the read duplication condition determination program code 11611 (see FIG. 4) to determine whether or not to execute duplication. If the situation corresponds to the conditions for performing replication, the virtual machine replication process S108 is executed with a replication execution program code 11612 (see FIG. 4), a virtual machine process discard condition determination program code 11711 (see FIG. 4), and speculative execution. A message for requesting the generation of a copy including the processing discard condition determination program code 11712 (see FIG. 4) is transmitted.

  The speculative execution environment discard determination process S115 is a discard flag 1172 that determines whether or not to transmit a message requesting discard to the virtual machine discard process S109 from the discard condition table 117 of the determination information storage unit 103 (see FIG. 4). Is read. The discard flag 1172 is registered as 0 when the condition for discarding the virtual machine process is satisfied, and 1 when the condition for discarding the speculative execution process is satisfied.

  Next, the speculative execution environment discard determination process S115 transmits a message requesting the virtual machine process S106A to be discarded to the virtual machine discard process S109 when the read discard flag 1172 is 0.

(Virtual machine replication process S108)
The virtual machine replication process S108 receives a message for requesting replication generation from the virtual machine environment replication determination process S111. Next, in the virtual machine duplication process S108, the speculative execution process S107 has all data stored in virtual hardware such as a virtual CPU, virtual memory, and virtual auxiliary storage device held by the virtual hardware included in the virtual machine process S106. Replicate to the same type of virtual hardware held by the virtual hardware.

  Next, the virtual machine duplication processing S108 transfers the duplication execution program code 11612 (see FIG. 4) attached to the message requesting duplication generation to the speculative execution processing 107 to the input transfer processing S104. The virtual machine duplication process S108 converts the virtual machine process discard condition determination program code 11711 (see FIG. 4) and the speculative execution process discard condition determination program code 11712 (see FIG. 4) to the screen data received from the speculative execution process S107. Is sent to the screen transfer process S105.

(Virtual machine discarding process S109)
The virtual machine destruction process S109 receives a message requesting destruction from the virtual machine environment destruction determination process S112. Next, the virtual machine discarding process S109 interrupts the execution of the virtual machine process S106 or the speculative execution process S107 running on the server 10, and the virtual machine process S106 or the speculative execution process S107 holds it. Discard all the virtual hardware that was left.

(Client 20)
The client 20 includes a communication unit 201, an input / output control process S202, a buffer unit 203, a screen unit 204, and an input device unit 205.

  Similar to the communication unit 101 included in the server 10, the communication unit 201 receives screen data transmitted from the server and transmits input information input from the input device unit 205.

  The input / output control process S <b> 202 receives screen data of the virtual machine from the communication unit 201. In the case where the received screen data includes the virtual machine process discard condition determination program code 11711 (see FIG. 4) or the speculative execution process discard condition determination program code 11712 (see FIG. 4), the input / output control process S202 includes: The screen data is regarded as the screen data sent from the speculative execution process S107, the screen data is stored in the buffer unit, and the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 is stored. Start execution. When the screen data does not include the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712, the screen data is displayed on the screen unit.

  The input / output control process S202 receives input information from the input device unit 205. When the virtual machine process discard condition determination program code 11711 (see FIG. 4) or the speculative execution process discard condition determination program code 11712 (see FIG. 4) is being executed, the input / output control process S202 displays a return value from the program code. Check. The return value from the program code is “determined” when the input operation executed on the client satisfies the condition for discarding the virtual machine process S106 executed on the server, and the input operation executed on the client If the speculative execution process S107 executed on the server satisfies the condition to be discarded, the status is “discarded”.

  The input / output control process S202 displays the screen data stored in the screen data 206 of the buffer unit 203 on the screen unit 204 when the “determined” status is returned in the return value from the program code. The screen data stored in the screen data 206 is discarded.

  When the “discard” status is returned in the return value from the program code, the input / output control process S202 discards the screen data stored in the buffer unit. The input / output control process S202 is performed when a status other than “determined” and “discard” is returned in the return value from the program code, or the virtual machine process discard condition determination program code 11711 (see FIG. 4) or speculative execution process When the discard condition determination program code 11712 (see FIG. 4) is not being executed, the operation content based on the input information is transmitted to the communication unit 201.

  The buffer unit 203 is a file system that stores the screen data 206 and the discard condition table 207 and can be referred to and discarded as necessary. In the screen data 206, virtual machine screen data received from the input / output control process S202 is registered. If the received screen data includes the virtual machine process discard condition determination program code 11711 (see FIG. 4) or the speculative execution process discard condition determination program code 11712 (see FIG. 4), the discard condition table 207 includes the program code. Is registered.

  The screen unit 204 is connected to, for example, a liquid crystal display, and the input device unit 205 is connected to, for example, a keyboard and a mouse.

  FIG. 2 is a diagram illustrating a hardware configuration of the server. The server 10 includes a CPU 301 that executes program execution, computation, and input / output processing, a memory 302 that is a main storage device, a communication device 303 that communicates with other devices via a network, and an auxiliary storage device. There is an internal communication line 305 that electrically connects a certain external storage device 304 and the above devices (CPU 301, memory 302, communication device 303, and external storage device 304).

  The external storage device 304 performs each process included in the virtual machine management unit 102 (input transfer process S104, screen transfer process S105, virtual machine process S106, speculative execution process S107, virtual machine duplication process S108, virtual machine discard process S109). A program for realizing, a program for realizing other processing (communication unit 101), a data storage area of the determination information storage unit 103, and a program necessary for the operation of the determination information storage unit 103 are held.

  The CPU 301 has a process for loading the program into the memory and executing it. Hereinafter, the description “A processing” refers to processing realized by being loaded into the memory and executed by the CPU. The descriptions “execute the program” and “execute the process A” refer to operations that the CPU executes a program that implements the process loaded in the memory.

  The communication device 303 has an interface for physically and electrically connecting a server and a network.

  FIG. 3 is a diagram illustrating a hardware configuration of the client. The client 20 includes a CPU 401 that executes program execution, computation, and input / output processing, a memory 402 that is a main storage device, a communication device 403 that communicates with other devices via a network, and an auxiliary storage device. An external storage device 404, an input device 405 that receives data input from an operator or the like via a keyboard, mouse, or the like, an output device 406 that outputs data to an operator or the like via a display, or the like (CPU 401 and memory 402) A communication device 403, an external storage device 404, an input device 405, and an internal communication line 407 that electrically connects the output device 406).

  The external storage device 404 includes a program that implements the input / output control process S202, a program that implements other processes (communication unit 201, screen unit 204, input device unit 205), a data storage area in the buffer unit 203, a buffer A program necessary for the operation of the unit 203 is held.

  The CPU 401 has a process for loading the program into the memory and executing it. The communication device 403 has an interface for physically and electrically connecting a server and a network. The input device 405 has an interface for physically and electrically connecting the client and the input device unit. The output device 406 has an interface for physically and electrically connecting a client and a screen unit or the like.

  FIG. 4 is a diagram illustrating an example of the data structure of the user copy condition table and the discard condition table registered in the determination information storage unit. The determination information storage unit 103 stores a replication condition table 116 and a discard condition table 117.

  The replication condition table 116 includes a replication execution condition 1161 and a replication flag 1162. The replication execution condition 1161 includes a combination of a replication condition determination program code 11611 and a replication execution program code 11612. The replication condition determination program code 11611 is a program code for determining whether or not the internal state of the virtual machine process S106 corresponds to a condition to be replicated with the virtual machine process S106 as a speculative execution process S107. The duplication execution program code 11612 is a program code executed in the speculative execution processing S107 when duplication is executed. The replication flag 1162 is a flag for determining whether or not to send a message requesting the virtual machine replication processing S108 to generate a replication. When the replication flag 1162 is 0, the message is not transmitted, and when the replication flag 1162 is 1, the message is transmitted.

  For example, the replication execution condition 1161 checks the position of the physical occupation area in the desktop for all the clickable rectangular objects in the desktop for the operating system in which the virtual machine process is being executed. Check if the mouse cursor is inside the occupied area, if true, return the coordinates of the mouse cursor, if false, return NULL, equivalent to performing a click operation with the coordinates of the current mouse cursor Program code for registering the effect into the operating system is registered.

  In the replication flag 1162, 0 is registered when NULL is returned in the replication execution condition 1161, and 1 is registered when the coordinates of the cursor are returned.

  The discard condition table 117 includes a discard execution condition 1171 and a discard flag 1172. The discard execution condition 1171 includes a set of a virtual machine process discard condition determination program code 11711 and a speculative execution process discard condition determination program code 11712. The virtual machine process discard condition determination program code 11711 is a program code for determining whether an input operation executed on the client corresponds to a condition for discarding the virtual machine process S106 executed on the server. The speculative execution process discarding condition determination program code 11712 is a program code for determining whether the operation corresponds to a condition for discarding the speculative execution process S107 executed on the server. The discard flag 1172 is a flag for determining whether to transmit a message requesting the discard of the virtual machine process S106 to the virtual machine discard process S109 or a message requesting the discard of the speculative execution process S107. When the discard flag 1172 is 0, a message requesting the discard of the virtual machine process S106 is transmitted. When the discard flag 1172 is 1, a message requesting the discard of the speculative execution process S107 is transmitted.

  For example, the discard execution condition 1171 includes a program code for determining whether or not a rectangular range created by the return value of the replication condition determination program code 11611 has been clicked, and a rectangular range created by the return value of the replication condition determination program code 11611. Program code for determining whether or not the mouse cursor is removed from the inside is registered.

  In the discard flag 1172, the mouse cursor is moved out of the rectangle created by the return value of the replication condition determination program code 11611 when the rectangle range created by the return value of the replication condition determination program code 11611 is clicked. In this case, 1 is registered.

  FIG. 5 is a flowchart illustrating an input / output control process when image data is received. With reference to FIG. 5, the process S10 when image data is received in the input / output control process S202 of the client 20 will be described.

  First, the input / output control process S202 receives the virtual machine screen data generated in the virtual machine process S106 or the speculative execution process S107 of the server 10 from the communication unit 201 of the client 20 (process S11).

  Next, the input / output control process S202 determines whether or not the received virtual machine screen data includes the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 (process S12). If the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 is included in the process S12 (Yes in process S12), the input / output control process S202 uses the received virtual machine screen data as the buffer unit 203. Is stored in the screen data 206 (process S13). Next, the input / output control process S202 executes the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 included in the received virtual machine screen data (process S14), and process S10. Exit.

  When the process S12 does not include the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 (No in process S12), the received virtual machine screen data is displayed on the screen unit 204 (process S15). ), And ends the process S10.

  FIG. 6 is a flowchart illustrating an input / output control process when input information is received. With reference to FIG. 6, the process S20 when the input information is received in the input / output control process S202 of the client 20 will be described.

  First, the input / output control process S202 receives input information from the input device unit 205 (process S21). Next, the input / output control process S202 determines whether or not the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 is being executed (process S22). When the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 is executed in the process S22 (Yes in the process S22), the return value of the executed program code is determined (process S23). The return value of the executed program code is “confirmed” status when the input operation executed on the client meets the condition for discarding the virtual machine process S106 executed on the server, and the input operation executed on the client When the speculative execution process S107 executed on the server satisfies the condition to be discarded, the status is “discarded”. If the return value of the executed program code is neither the “confirmed” status nor the “discarded” status in processing S23, the processing proceeds to processing S26.

  When the return value of the program code executed in the process S23 is “confirmed” status, the input / output control process S202 displays the screen data 206 of the buffer unit 203 on the screen unit 204 (process S24), and ends the process S20. When the return value of the program code executed in the process S23 is “discard” status, the input / output control process S202 discards the screen data 206 in the buffer unit 203 (process S25), and ends the process S20.

  When the virtual machine process discard condition determination program code 11711 or the speculative execution process discard condition determination program code 11712 is not executed in the process S22 (No in process S22), the received input information is transmitted to the communication unit 201 (process S26). Then, the process S20 is terminated.

  FIG. 7 is a flowchart illustrating the input transfer process. Details of the input transfer processing S104 of the server 10 will be described with reference to FIG. First, the input transfer process S104 receives input information from the communication unit 101 (process S301). Next, the input transfer process S104 transmits the input information to the virtual machine environment desktop process S110 (process S302).

  Next, the input transfer process S104 receives the duplication execution program code 11612 read from the duplication condition table 116 from the virtual machine duplication process S108 (process S303). Next, the input transfer process S104 inputs the received duplication execution program code 11612 into the speculative execution environment desktop process S113 of the speculative execution process S107 (process S304), and ends the input transfer process S104.

  FIG. 8 is a flowchart illustrating the screen transfer process. Details of the screen transfer processing S105 of the server 10 will be described with reference to FIG. First, the screen transfer process S105 receives the screen data generated in the virtual machine environment desktop process S110 or the speculative execution environment desktop process S113 (process S401).

  Next, the screen transfer process S105 receives from the virtual machine duplication process S108 an instruction to attach the virtual machine process discard condition determination program code 11711 and the speculative execution process discard condition determination program code 11712 read from the discard condition table 117 to the screen data. (Processing S402).

  Next, the received screen data, virtual machine process discard condition determination program code 11711 and speculative execution process discard condition determination program code 11712 are transmitted to the communication unit 101 (process S403), and the screen transfer process S105 is terminated.

  FIG. 9 is a flowchart illustrating virtual machine processing. Details of the virtual machine processing S106 of the server 10 will be described with reference to FIG. First, the virtual machine process S106 executes a virtual machine environment desktop process S110 (process S501). Details of the virtual machine environment desktop process S110 will be described later with reference to FIG.

  Next, the virtual machine process S106 executes a virtual machine environment duplication determination process S111 (process S502). Details of the virtual machine environment duplication determination process S111 will be described later with reference to FIG.

  Next, the virtual machine process S106 executes a virtual machine environment destruction determination process S112 (process S503), and ends the virtual machine process S106. Details of the virtual machine environment destruction determination process S112 will be described later with reference to FIG.

  FIG. 10 is a flowchart illustrating virtual machine environment desktop processing. Details of the virtual machine environment desktop process S110 of the virtual machine process S106 of the server 10 (details of the process S501) will be described with reference to FIG. First, the virtual machine environment desktop process S110 receives input information from the input transfer process S104 (process S5011).

  Next, the virtual machine environment desktop process S110 performs an input operation in the virtual machine based on the received input information (process S5012), and generates screen data in the virtual machine based on the input operation (process S5013). Then, the virtual machine environment desktop process S110 transmits the generated screen data to the screen transfer process S105 (process S5014), and ends the virtual machine environment desktop process S110.

  FIG. 11 is a flowchart illustrating the virtual machine environment duplication determination process. Details of the virtual machine environment duplication determination processing S111 of the virtual machine processing S106 of the server 10 (details of processing S502) will be described with reference to FIG.

  First, in the virtual machine environment duplication determination process S111, the duplication condition determination program code 11611 from the duplication condition table 116 stored in the determination information storage unit 103, the virtual machine process discard condition determination program code 11711 from the discard condition table 117, and The speculative execution process discarding condition determination program code 11712 is read (process S5021). Next, the virtual machine environment replication determination process S111 executes the read replication condition determination program code 11611 (process S5022). Details of the process S5022 will be described later with reference to FIG.

  Next, the virtual machine environment duplication determination processing S111 determines whether the duplication flag 1162 is 0 or 1 (processing S5023). When the copy flag 1162 is 0 in the process S5023, the read copy condition determination program code 11611 is repeatedly executed (process S5022). When the replication flag 1162 is 1 in process S5023, the replication execution program code 11612 read from the replication condition table 116 in the virtual machine replication process S108, the virtual machine process discard condition determination program code 11711 read from the discard condition table 117, and speculative execution. The process discard condition determination program code 11712 is attached to request replication (process S5024), and the virtual machine environment replication determination process S111 is terminated.

  FIG. 12 is a flowchart illustrating the virtual machine environment discard determination process. Details of the virtual machine environment discard determination process S112 of the virtual machine process S106 of the server 10 (details of the process S503) will be described with reference to FIG.

  First, the virtual machine environment discard determination process S112 executes the virtual machine process discard condition determination program code 11711 and the speculative execution process discard condition determination program code 11712 (process S5031). Details of the process S5031 will be described later with reference to FIGS.

  Next, the virtual machine environment discard determination process S112 determines whether the discard flag 1172 is 0 or 1 yet (process S5032). If the discard flag 1172 is neither 0 nor 1 (not yet known) in the process S5032, the execution of the virtual machine process discard condition determination program code 11711 and the speculative execution process discard condition determination program code 11712 is repeated (process S5031). When the discard flag 1172 is 0 in process S5032, the virtual machine discard process S109 is requested to discard the virtual machine process S106 (process S5033), and the virtual machine environment discard determination process S112 is terminated. When the discard flag 1172 is 1 in process S5032, the virtual machine discard process S109 is requested to discard the speculative execution process S107 (process S5034), and the virtual machine environment discard determination process S112 is terminated.

  FIG. 13 is a flowchart illustrating a speculative execution environment desktop process. Details of the speculative execution environment desktop process S113 of the speculative execution process S107 of the server 10 will be described with reference to FIG.

  First, the speculative execution environment desktop process S113 receives the copy execution program code 11612 from the input transfer process S104 (process S601). Next, the speculative execution environment desktop process S113 executes the received duplication execution program code 11612 (process S602).

  Next, the speculative execution environment desktop process S113 generates screen data when the speculative execution is performed (process S603). Then, the speculative execution environment desktop process S113 transmits the generated screen data to the screen transfer process S105 (process S604), and ends the speculative execution environment desktop process S113.

  FIG. 14 is a flowchart illustrating a virtual machine replication process. Details of the virtual machine duplication processing S108 of the server 10 will be described with reference to FIG. First, the virtual machine duplication process S108 receives a duplication request from the virtual machine environment duplication determination process S111 (process S701). Next, the virtual machine duplication process S108 generates a speculative execution process S107 as a duplication of the virtual machine process S106 (process S702).

  Next, the virtual machine duplication process S108 instructs the input transfer process S104 to input the duplication execution program code 11612 read from the duplication condition table 116 to the speculative execution process S107 (process S703).

  Next, the virtual machine duplication process S108 attaches the virtual machine process discard condition determination program code 11711 and the speculative execution process discard condition determination program code 11712 read from the discard condition table 117 to the screen data received from the speculative execution process S107. The screen transfer process S105 is instructed (process S704), and the series of processes is terminated.

  FIG. 15 is a flowchart illustrating the virtual machine discarding process. Details of the virtual machine discarding process S109 of the server 10 will be described with reference to FIG. First, the virtual machine discarding process S109 receives a request for discarding the virtual machine process S106 or the speculative execution process S107 from the virtual machine environment discarding determination process S112 of the virtual machine process S106 (process S801).

  Next, the virtual machine discard process S109 discards the virtual machine process S106 or the speculative execution process S107 (process S802), and ends the virtual machine discard process S109.

  FIG. 16 is a flowchart illustrating the copy condition determination program code execution process. With reference to FIG. 16, the processing S5022 of the replication condition determination program code 11611 will be described. First, the virtual machine environment duplication determination process S111 examines areas for all clickable objects in the desktop (process S50221). Next, the virtual machine environment duplication determination process S111 examines the coordinates of the upper left and lower right of the area for all clickable objects in the desktop (process S50222).

  Next, the virtual machine environment duplication determination process S111 confirms whether or not the mouse cursor is in the range for all clickable objects in the desktop (process S50223). When the condition is satisfied in the process S50223 (Yes in the process S50224), the upper left and lower right coordinates of the area are returned for all the clickable objects in the desktop (process S50225). Next, the virtual machine environment duplication determination processing S111 registers 1 in the duplication flag 1162 of the duplication condition table 116 (processing S50226), and ends the processing S5022.

  If the condition is not satisfied in process S50223 (No in process S50224), NULL is returned (process S50227). Next, the virtual machine environment duplication determination processing S111 registers 0 in the duplication flag 1162 of the duplication condition table 116 (processing S50228), and ends the processing S5022.

  FIG. 17 is a flowchart illustrating the virtual machine process discard condition determination program code execution process. With reference to FIG. 17, the process S5031A of the virtual machine process discard condition determination program code 11711 will be described. First, the virtual machine environment discard determination processing S112 determines whether or not the inside of the rectangle created by the return coordinates of the replication condition determination program code 11611 has been clicked (processing S50311).

  When the condition is satisfied in the process S50311 (Yes in the process S50311), the virtual machine environment discard determination process S112 registers 0 in the discard flag 1172 of the discard condition table 117 (process S50312) and ends the process S5031A. On the other hand, when the condition is not satisfied in the process S50311 (No in the process S50311), the virtual machine environment discard determination process S112 ends the process S5031A.

  FIG. 18 is a flowchart illustrating the speculative execution process discard condition determination program code execution process. With reference to FIG. 18, the process S5031B of the speculative execution process discard condition determination program code 11712 will be described. The virtual machine environment discard determination process S112 determines whether or not the mouse cursor has been removed from the range of the rectangle created by the return value coordinates of the replication condition determination program code 11611 (process S50313).

  When the condition is satisfied in the process S50313 (Yes in the process S50313), the virtual machine environment discard determination process S112 registers 1 in the discard flag 1172 of the discard condition table 117 (process S50314), and ends the process S5031B. When the condition is not satisfied in the process S50313 (No in the process S50313), the virtual machine environment discard determination process S112 ends the process S5031B.

  In the present embodiment, when the desktop state of the client 20 satisfies one of one or more replication conditions, the virtual machine replication process S108 of the server 10 performs a speculative execution process as a replication of the virtual machine process S106. S107 is created. Assuming that the operation set for each condition is actually performed, the speculative execution environment desktop process S113 speculatively executes the desktop operation. The screen transfer process S105 transmits the screen data after the speculative operation to the client 20. The transmitted screen data is buffered in the buffer unit 203 of the client 20. When the operation is actually executed by the client 20, the input / output control process S202 can immediately reflect the buffered screen data on the screen unit 204. That is, in the thin client system of the present embodiment, a speculative execution environment is generated as a copy of the virtual machine environment of the server 10, speculative execution is performed in the created speculative execution environment, and screen data after speculative execution is sent to the client. Can be transferred to.

10 server 20 client 101, 201 communication unit 102 virtual machine management unit 103 determination information storage unit 116 replication condition table (replication condition information)
117 Discard condition table (discard condition information)
203 Buffer Unit 204 Screen Unit 205 Input Device Unit 301 CPU (Processing Unit)
302, 402 Memory 303, 403 Communication device 304 External storage device (storage unit)
305, 407 Internal communication line 401 CPU (client processing unit)
404 External storage device 11611 Replication condition determination program code 11612 Execution program code at replication 11711 Virtual machine processing discard condition determination program code (virtual machine discard condition determination program code)
11712 Speculation execution process discard condition determination program code (Speculation execution discard condition determination program code)
S104 Input transfer process S105 Image transfer process S106 Virtual machine process (virtual machine)
S107 Speculation execution processing (replication virtual machine)
S108 Virtual machine duplication processing S109 Virtual machine destruction processing S110 Virtual machine environment desktop processing S111 Virtual machine environment duplication determination processing S112 Virtual machine environment destruction judgment processing S113 Speculation execution environment desktop processing S114 Speculation execution environment duplication determination processing S115 Speculation execution environment destruction judgment processing S202 Input / output control processing

Claims (5)

The client can communicate with the client via a network, generates a virtual machine of the client, generates image data to be displayed on the client based on input information of the client, and generates the client And a server for transmitting the image data, and the server creates screen data necessary for executing the operation of the desktop of the client from the input information received from the client and transmits the screen data to the client. A thin client system
The server
A replication condition determination program code for determining whether the virtual machine environment desktop processed by the virtual machine is in a state to be replicated, and whether the virtual machine environment desktop executed by the virtual machine is to be discarded Whether or not the speculative execution environment desktop of the replicated virtual machine copied based on the virtual machine is in a state to be discarded or not, a discard condition determination program code, and a storage unit storing
When the input information is received from the client, the replication condition determination program code is executed, and when the condition for executing replication is satisfied, the replication virtual machine is generated as a replication of the virtual machine and the generated The image data of the speculative execution environment desktop is generated by a duplicate virtual machine, and the generated image data is attached to the discard condition determination program code and transmitted to the client. Thereafter, the input information received from the client is A processing unit that treats the replicated virtual machine as the virtual machine of the client, discards the original virtual machine, and continues processing when the conditions for performing the replication are met,
The client
A buffer unit for storing the received screen data and the discard condition determination program code attached to the received screen data;
Execute the discard condition determination program code, if the virtual machine environment desktop is in a state to be discarded, reflect the received screen data on the display unit, if the speculative execution environment desktop is in a state to be discarded, A thin client system comprising: a client processing unit that discards image data in the buffer unit. The duplication condition determination program code checks the position of the physical occupation area on the desktop of the clickable object in the client desktop, and whether the mouse cursor is in the occupation area of any object. A program to check
When the destruction condition determination program code is executed in the occupied area, the virtual machine environment desktop executed by the virtual machine is output to be discarded, and when the mouse cursor is removed from the occupied area, the duplicate virtual machine is output. The thin client system according to claim 1, wherein the program outputs that the speculative execution environment desktop is discarded. A virtual machine of the client is made communicable with the client via a network, and image data to be displayed on the client is generated by the virtual machine based on input information of the client, and the image data is transmitted to the client A server that sends
The server
Replication condition information having a replication condition determination program code for determining whether the virtual machine environment desktop processed by the virtual machine is in a state to be replicated;
Discards the virtual machine destruction condition determination program code for determining whether or not the virtual machine environment desktop to be executed by the virtual machine should be destroyed and the speculative execution environment desktop of the duplicate virtual machine copied based on the virtual machine A discarding condition information having a speculative execution discarding condition determination program code for determining whether or not it is in a state to be stored;
When receiving input information from the client, execute the replication condition determination program code,
When the conditions for performing the duplication are satisfied, the duplication virtual machine is generated as the duplication of the virtual machine, and the speculative execution environment desktop image data is generated by the generated duplication virtual machine,
The generated image data is sent to the client with the virtual machine discard condition determination program code and the speculative execution discard condition determination program code attached thereto,
Thereafter, when the input information received from the client matches the conditions for performing the replication, the replicated virtual machine is treated as the virtual machine of the client, the original virtual machine is discarded, and the processing is continued. A server comprising a processing unit. The duplication condition determination program code checks the position of the physical occupation area on the desktop of the clickable object in the client desktop, and whether the mouse cursor is in the occupation area of any object. A program to check
The virtual machine destruction condition determination program code is a program that, when executed in the occupied area, outputs that the virtual machine environment desktop executed by the virtual machine is destroyed,
The said speculative execution destruction condition determination program code is a program which outputs that the speculative execution environment desktop of the said replication virtual machine is destroyed when a mouse cursor remove | deviates from the said occupied area. Server. A client for performing screen display based on screen data received from the server according to claim 3,
A buffer unit for storing the received screen data and a virtual machine process discard condition determination program code and a speculative execution process discard condition determination program code attached to the received screen data;
When the virtual machine destruction condition determination program code and the speculative execution destruction condition determination program code are executed and the virtual machine environment desktop is in a state to be discarded, the received screen data is displayed on a display unit, and the speculative execution is performed. A client processing unit comprising: a client processing unit that discards image data in the buffer unit when the environment desktop is in a state to be discarded.

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