JPH01239655A - Virtual space control system - Google Patents

Abstract

PURPOSE:To improve reliability by monitoring a continuous free area in a virtual space, and performing the regeneration of the virtual space. CONSTITUTION:A job start processing part 121 secures the continuous free space used by a batch job 100 in the virtual space 30 by starting up a job processor 10, and makes access via a memory controller 20, and executes a series of processings. A continuous free area monitoring part 123 finds the maximum continuous free area in the space 30 by information from a job completion processing part 122 based on the content of a free area managing area 21, and compares it with the maximum value required for the job, and decides the generation of fragmentation. When the free area in the space 30 is small, the monitoring part 123 performs the regeneration by starting up a virtual space generating part 11. In other words, the operation of a control part 12 is stopped transiently, and after that, the control part 12 is re-started up. Meanwhile, when the free area in the space 30 is large, it is assumed that no fragmentation is generated, and the monitoring part 123 delivers control to the processing part 121 immediately. Thereby, since the fragmentation between the virtual spaces can be dissolved automatically, the reliability can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a virtual space control method for a computer system, and in particular, a virtual space control method suitable for eliminating fragmentation in a virtual space caused by the termination of a job. Regarding the method.

[Conventional technology]

In a multiple virtual memory computer system, a batch control unit is attached to one virtual space and controls the execution of batch jobs. On the other hand, the user specifies the maximum value of continuous free space to be used by the job and requests execution of the job.

A desired continuous free area in the virtual space is secured for the job by the batch control unit, and the job executes processing using that area. When the execution of the job is finished, the batch control unit releases the area, but at this time, some areas may remain in use, and as a result, the free space in the virtual space may jump from one to another. It may happen. This is called fragmentation. Conventionally, no consideration has been given to the fragmentation of the virtual space that occurs when the execution of this job ends. Note that, for example, Japanese Patent Laid-Open No. 118966/1984 is related to this type of job execution control within a virtual space.

[Problem to be Solved by the Invention] In the conventional technology, fragmentation of a virtual space that occurs depending on the end state of a job is not taken into account, so that the batch control unit repeats job start processing and job end processing within the virtual space. When controlling the execution of jobs in succession, there is a problem in that subsequent jobs cannot be executed due to a lack of continuous free space in the virtual space.

An object of the present invention is to provide a virtual space control method that eliminates the shortage of continuous free space due to fragmentation when batch jobs are executed continuously in a virtual space, and ensures the execution of subsequent jobs. .

[Means to solve the problem]

The above object is achieved by providing means for monitoring continuous free space within the virtual space and means for re-creating the virtual space.

[For production]

The means for monitoring the continuous free space in the virtual space operates every time a job ends, and the means for monitoring the continuous free space in the virtual space is determined based on the maximum value of the continuous free space used by the job specified by the user to be executed in the virtual space. When the size of the continuous free area is small, it is determined that fragmentation has occurred and a means for recreating the virtual space is activated, and
Finish creating. This eliminates fragmentation of the virtual space, and prevents subsequent jobs from becoming unexecutable due to a lack of continuous free space within the virtual space.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which 10 indicates a job processing device, 20 a storage control device, and 30 a virtual space. Here, the job processing device 10 is in the virtual space 30
Virtual space re-creation unit 11 and patch job 1 that re-create
It consists of a batch control unit 12 that controls the execution of 00. The batch control unit 12 also includes a job start processing unit 121, a job end processing unit 122, and a continuous free area monitoring unit 123 or 6.
4iΦ is formed. The storage control device 20 is a virtual space 3
Free space management table 2 that manages continuous free space within 0
I have 1. In the free space management table 21, for each continuous free space existing in the virtual space 30, the start address (A) and length (Q) of the corresponding free space are stored in a chain format.

21 and 21 show a flowchart when patch jobs are successively processed by the job processing apparatus 10 shown in FIG.

When starting up the job processing device 10, the user executes patch job 1.
00 specifies the maximum value of continuous free space required and requests execution of the job. The maximum value of the continuous free area used by this job 1.00 is held in the continuous free area monitoring unit 123 of the batch control unit 12. On the other hand, it is assumed that the entire virtual space 30 is initialized to be a free space. The state of the virtual space 30 at this time is shown in FIG. 3(a), and the corresponding contents of the free space management table 21 in the storage control device 20 are shown in FIG. 3(b).

By starting the job processing device 10, the batch control section 12 is launched into the virtual space 30.

Upon receiving a request for job processing, the job start processing unit 121 of the batch control unit 12 secures a continuous free space in the virtual space 30 to be used by the patch job 100, and communicates it to the patch job 100 to start the job. Processing is started (step 201).

The patch job 100 accesses the virtual space 30 via the storage control device 20 and executes a series of processes using the area secured within the virtual space 30 (step 202).
. When the job processing ends, the batch end processing section 122 of the batch control section 12 releases the area secured by the job start processing section 121 (step 203). In job processing, the virtual space 30 is accessed independently of the batch control unit 12, so if there is an area in the virtual space 30 that is currently being used in job processing, the job termination process 1
In the process of 22, the area is not released and remains in use. FIG. 4(a) shows the state of the virtual space 30 at this time, with the shaded area showing the area left in use.

The corresponding contents of the free space management table 21 in the storage control device 20 are as shown in FIG. 4(b).

When the continuous free space monitoring unit 123 of the batch control unit 12 receives the notification of job processing completion from the job completion processing unit 122, the continuous free space monitoring unit 123 determines the maximum amount of space existing in the virtual space 30 based on the contents of the free space management table 21 of the storage control device 20. Find the continuous free area of Determine whether fragmentation has occurred within 30 (
Step 204). If the maximum continuous free area in the virtual space 30 is smaller than the maximum continuous free area required by the job, it is assumed that fragmentation has occurred, and the continuous free area monitoring unit 123 determines that fragmentation has occurred.
4) Start the creation section 11.

The virtual space +1) creation unit 11 creates a virtual space (step 205). This temporarily stops the operation of the batch control unit 12 attached to the virtual space 30, and then This is done by restarting the control unit 12. That is, by stopping the operation of the batch control unit 12, the connection between the batch control unit 12 and the virtual space 30 is released.
The virtual space 30 is initialized to the state shown in FIG. 3(a). Then, by restarting the batch control unit 12, connection with the fortune-telling virtual space 30 occurs. At this time, the contents of the free space management table 21 of the storage control device 20 are as shown in FIG.
).

When the batch control unit 12 receives the write start, it determines whether there is any subsequent job processing in the job start processing unit 121 (step 206), and if there is, it causes the job start processing unit 121 to start executing the subsequent job processing.

At this time, since the virtual space 30 has been initialized, a continuous free area used for job processing is reliably secured in the virtual space 30, so that jobs can be processed continuously.

On the other hand, if the maximum continuous free area in the virtual space 30 is larger than the maximum continuous free area required by the job in step 204, the continuous free space monitoring unit 123 determines that fragmentation has not occurred. I reckon. In this case, the continuous free space monitoring unit 123 immediately passes control to the job start processing unit 121.

In any case, since the subsequent job is reliably executed in the virtual space 30, the execution of the subsequent job will not become impossible due to a lack of continuous free space in the virtual space 30.

〔Effect of the invention〕

As explained below, according to the present invention, fragmentation of a virtual space can be automatically resolved, so that subsequent jobs cannot be executed due to lack of continuous free space in the virtual space due to the occurrence of fragmentation of the virtual space, unlike in the past. It is no longer impossible to do so, and the reliability of the system can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
Figure 3 is a diagram showing the correspondence between the virtual space initialization state and the free space management table, and Figure 41d is a diagram showing the correspondence between the virtual space fragmentation state and the free space management table. It is a figure showing a relationship. DESCRIPTION OF SYMBOLS 10...Job processing device, 11...Virtual space document creation section, 12...Batch control section, 121...Job start processing section, 122...Job end processing section. 123...Continuous free space monitoring unit, 20...Storage control device, 21...Free space management table 1. 30...Virtual space. Figure 1 Figure 3 (b) [70 Figure 4 (shi)

Claims (1)

[Claims] (1) In a computer system that processes jobs continuously by repeatedly performing job start processing and job end processing within a virtual space, each time a job ends, the continuous free space within the virtual space is checked and the amount of space required by the job is checked. A virtual space control method that recreates a virtual space when there is a shortage of continuous free space.