JPH044456A - Shared file processing system - Google Patents

Abstract

PURPOSE:To improve the processing efficiency of a computer system by reserving a shared file required for the execution of a job under a usable condition only and starting the job after the file has been reserved. CONSTITUTION:In the case a shared file 3 is required for processing an inputted job, each computer 10 executes reservation by regarding the using state information 15 of sharing controlling information 12 as a value decided by the using state of the job and increasing the value of a reservation counter 13 only when the sharing controlling information 12 of the file 3 and the using state required by the job meets prescribed conditions. When the reservation has been made, each computer 10 starts to process the job and, when the job starts to use the file 3, reduce the value of the counter 13 and indicates a prescribed value indicating the use of the file by the computer 10 on a used-system indicator 14. Therefore, the processing efficiency of each computer is improved, because useless holding of resources due to the waiting time for the use of the shared file 3 in a state where other system resources are assigned to the job is eliminated.

Description

[Detailed description of the invention]

[Summary] In a computer system consisting of multiple loosely coupled computers,
With regard to file sharing, the purpose is to provide a file sharing processing method that enables efficient sharing control, and includes a shared file, multiple computers, and a control information storage device, and the shared file can be accessed from each computer. The control information storage device is connected to be accessed from each computer by a mechanism that exclusively connects to the computer at the request of each computer, and holds predetermined shared control information, The shared control information consists of a reservation counter, a usage system display, and usage status information that correspond to each shared file, and each computer uses the shared file to process a job input to the computer. If necessary, the usage status information of the shared control information is used by the job only if the shared control information of the shared file and the usage status requested by the job satisfy a predetermined condition. A value determined from the situation, the reservation is executed by increasing the value of the reservation counter, processing of the job is started after the reservation is successful, and when the job starts using the shared file, the reservation is executed. The counter value is decremented, and a predetermined value indicating that the computer is in use is displayed on the usage system display during the usage. [Industrial Application Field] The present invention relates to a processing method for sharing files in a computer system consisting of a plurality of loosely coupled computers. [Prior Art] FIG. 5 is a block diagram showing an example of the configuration of a computer system. Each of the plurality of computers 1 is a system having a function of processing jobs submitted independently, and also shares a shared file 3 stored in a shared external storage device 2 such as a magnetic disk storage device. Configure loosely coupled systems. In that case, when data is updated for the shared file 3 on any computer 1, at least the data part to be processed is , control that is exclusive so that it is not used in other processes, that is, exclusive control,
What is necessary to avoid inconsistencies in related processing is well known. For this purpose, the following exclusive control method is used, for example, to occupy a file as a unit when necessary. In other words, an external storage device 4 to which the necessary computer is connected.
Shared control information 5 is provided in . Also, this external storage device 4
A switching mechanism 6 is provided. The switching mechanism 6 is a known mechanism that connects the external storage device 4 only to the computer 1 by issuing an occupation command from the computer 1 until the occupation is canceled by a release command. The shared control information 5 consists of control information corresponding to each necessary shared file 3, and each piece of control information includes, for example, a usage system display and usage status information, and the usage system display corresponds to, for example, each calculation a1. A bit string consisting of 1 bit each. The usage status is, for example, 1 bit, and the usage is either one that allows sharing (hereinafter referred to as "shared") or one that requires exclusive occupancy (
(hereinafter referred to as exclusive) is represented by 0 and 1. All initial values are 0. The computer 1 processes a job, and when the job issues a request to use the shared file 3, the computer 1 first tries to occupy the external storage device 4 by the switching mechanism 6 as described above. As a result, if the occupation is successful, the shared control information 5 is read, and if the job request is only for file reference, the control information of the necessary shared file 3 is checked and if the usage status column is O, the shared control information 5 is read. Since the file 3 can be used, the shared control information 5 is updated so that the bit assigned to itself in the used system display column is set to 1, the switching mechanism 6 is released, and job processing is resumed. If the job request involves updating files,
Look at the used system display column, and the shared file 3 can be used only if all bits are O. In that case, set the bit assigned to itself in the used system display column to 1, and The shared control information 5 is updated so that the usage status column is set to 1, the switching mechanism 6 is released, and job processing is resumed. If none of the above conditions apply, the shared file 3 cannot be used immediately and it is necessary to wait until one of the conditions is satisfied. After a waiting period, the above process is attempted. When the necessary shared file 3 is successfully occupied and the process is completed, the shared control information 5 is again occupied as described above, and the control information of the shared file 3 is displayed in the system used display column. After the corresponding hit and the bits in the usage status column are set to 0, the shared control information 5 is released. [Problems to be Solved by the Invention] Through the above processing, exclusive control of the shared file 3 can be performed, but after the execution of the job has started,
If the necessary shared file 3 is not successfully occupied, the various computer resources allocated to the job are put on hold until the job is successfully occupied.
There is a problem of deteriorating resource utilization efficiency. The object of the present invention is to provide a file sharing processing method that enables efficient sharing control. [Means for Solving the Problems] FIG. 1 is a block diagram showing the configuration of the present invention. The figure shows the configuration of a file sharing processing system, which includes a shared file 3, a plurality of computers 10, and a control information storage device 11. The shared file 3 is connected to be accessed from each computer 10 and controlled The information storage device 11 is connected to be accessed from each computer 10 by a switching mechanism 6, which is a mechanism that exclusively connects to the computer 10 at the request of each computer 10, and holds predetermined shared control information 12.
The shared control information 12 consists of a reservation counter 13, a usage system display 14, and usage status information 15, which correspond to each shared file 3, and each computer 10 is configured to process jobs input to the computer. When a shared file 3 is required, the usage status information 15 of the shared control information is provided only when the shared file's shared control information 12 and the usage status requested by the job satisfy a predetermined condition. The value is determined based on the usage status of the job, and the reservation counter 1
Execute reservation by increasing the value of reservation counter 13, start processing the job after the reservation is successful, and increase the value of reservation counter 13 when the job starts using shared file 3. During the use, the used system display 14 displays a predetermined value indicating that the computer is in use. [Operation] With this processing method, the shared files necessary for job execution are reserved only when the conditions are available, and the job is started after the reservation is completed, so it is easier to allocate other system resources to the job. In this case, resources are no longer needlessly reserved due to waiting for shared files to be used, and the processing efficiency of the computer system can be improved. [Embodiment] FIG. 2 is a block diagram showing the configuration of an embodiment system of the present invention. Three computers 8a, 8b, and 8c constitute a loosely coupled system, and each computer 8a, 8b, and 8c is When job input consisting of job control statements is received from the input devices 9a, 9b, and 9c, it is stored in the job storage device 2.
0 to form a queue, and each computer 8a, 8
b and 8c, when the resource state is ready for job processing, extracts the job control statement from the job storage device 20 and analyzes it;
If the job is to be processed by itself, execute it as follows. For this purpose, the job storage device 20 also has a switching mechanism similar to the control information storage device 11, and stores job control statements.
During retrieval, each computer is allowed to occupy the job storage device. The external storage device 2 and control information storage device 11 in FIG. 2 are the same as those in FIG. 1. FIG. 3 shows an example of the processing flow in job processing of each computer 8a, 8b, and 8c. In processing step 3o, the job queue of the job storage device 20 is checked, and if there is a job, processing step 31 stores the job in the order of arrival, for example. Fetch the job and parse the job control statements. As a result of the analysis, if it is specified in processing step 32 that the job is not to be processed on the own computer, processing step 40
After returning the job to the queue, the process returns to step 30 to begin processing the next job. If the job is to be processed by the own computer, it is determined in processing step 33 whether the job has been reserved if a shared file is used. If the reservation has not been completed, reservation processing is performed in processing step 34. The reservation process occupies the control information storage device 11 and checks the control information of the required shared file in the shared control information 12.If the usage status information 15 column is 0 as in the past, the shared file is reserved for reference only. When using the shared file 3, the shared file 3 can be used, so the reservation counter 13 of the present invention is incremented by 1 to make a reservation. In the case of use that involves updating, check the usage system display column and note that the shared file 3 can be used only if all bits are 0, so in that case, increase the reservation counter 13 by 1. , and the usage status information 15 is set to 1 to indicate "exclusive". The reservation is considered successful only if the reservation counter can be incremented by any of the above methods. The above reservation processing is tried for all the shared files requested by the job, and if all are successful, the sharing control information for all those shared files is updated as described above. Next, in process step 35 it is determined whether the reservation was successful, and if unsuccessful, the process returns to process step 30 via process step 40. If successful, start execution of the job step as shown below. Note that while processing the job queue as described above, the switching mechanism is controlled to occupy the job storage device 20 with the computer, and when the process proceeds to processing step 36 after completing the determination in processing step 35, - Release the possession. When executing a job step, first, in processing step 36, the reservation counter 13 of the shared control information 12 is decremented by 1 for the shared file used in that job step.
Set the bit corresponding to the computer in use system display 14 to 1.
After that, the job step is executed in processing step 37. When the execution of the job step is completed, in processing step 38, the bit of the usage system display 14 of the corresponding shared control information 12 and the usage status information 15 are reset. Furthermore, if the same shared file is to be used again in a later job step, it is re-reserved in the same manner as described above. In process step 39, it is determined whether the job has a subsequent job step, and if not, the process returns to process step 30 to process the next job, but if there is a subsequent job step, process step 32 returns. FIG. 4 is a diagram explaining an example of job processing, in which three jobs X, Y, and
Assuming that Z is input in this order, job X consists of two job steps, and the first job step is computer A,
Assume that the second job step is specified to be executed on computer B, and the job control statement specifies that both job steps refer to the shared file FILE. Further, job Y and job Z may be executed on any computer; job Y updates the shared file FILE, and job Z requests reference. The following explanation corresponds to phases ① to [phase] in FIG. 4. ① First, when computer A takes out job X, it reserves it in the shared control information of FILE and sets the reservation counter to 1. ■ Next, computer B retrieves job Y and attempts to reserve FILE, but since job Y is requesting update processing, it must be reserved exclusively, and the shared control information for FILE is already I cannot make a reservation because I have a reservation. ■ When computer C retrieves job Z and makes a reservation for FILE, this is a reference request, so it is successful and the reservation counter is incremented to 2. ■ To start execution of job X on computer A, set the reservation counter by -1 to 1 and set the used system display. - In order to start executing job Z on computer C, the reservation counter is decreased by 1 to 0, and the system used display is set. ■ When the first job step of job
Keep it. - To start the second job step of job X on computer B, set the reservation counter by -1 to 0 and set the used system display. ■ When the second job step of job X is completed, computer B turns off the display of the system in use. - When job Z is finished, computer C erases the display of the system in use, and the shared control information of FILE becomes completely empty. [Phase] For example, when computer A retrieves job Y and makes a reservation for FILE, the reservation is successful, the reservation counter is set to 1, the usage information is set to 1, and job Y is
becomes possible. [Effects of the Invention] As is clear from the above description, according to the present invention, sharing control for file sharing can be efficiently performed in a computer system consisting of a plurality of loosely coupled computers, thereby improving the processing efficiency of the system. This has a significant industrial effect. 4,

[Brief explanation of Figure (13)] Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing an embodiment of the present invention, Figure 3 is a flowchart of the processing of the present invention, and Figure 4 is a block diagram showing the configuration of the present invention. The figure is a diagram for explaining job processing according to the present invention, and FIG. 5 is a block diagram showing an example of a conventional configuration. In the figure, 110.8a, 8b, 8c are computers, 2.4 is an external storage device, 3 is a shared file, 5.12 is shared control information, 6 is a switching mechanism, 11 is a control information storage device, and 13 is a reservation counter. , 14 is the usage system display, 15 is the usage status,
20 is a job storage device, and 30 to 40 are processing steps.

Claims (1)

[Claims] It has a shared file (3), a plurality of computers (10), and a control information storage device (11), and the shared file (3) is accessed from each computer (10). The control information storage device (11) is connected so as to be accessed from each computer (10) by a mechanism (6) that connects exclusively to the computer (10) at the request of the computer (10), and This shared control information (12) includes a reservation counter (13), a usage system display (14), and usage status information corresponding to each shared file (3). (15), and if each computer (10) requires the shared file (3) to process a job input to the computer, the shared control information (12) of the shared file and the usage status requested by the job satisfy a predetermined condition, the usage status information (15) of the shared control information is set to a value determined from the usage status of the job, and the reservation counter (1
3) execute the reservation by increasing the value of the reservation counter (13), start processing the job after the reservation is successful, and when the job starts using the shared file (3); A file sharing processing method characterized in that the file sharing processing method is configured to subtract a value of , and display a predetermined value indicating that the computer is in use on the system in use display (14) during the use.