JPS63279327A - Control system for allocation of resources designated by job control sentence - Google Patents

Abstract

PURPOSE:To improve the availability of resources by allocating the resources designated by a job control language JCL when said resources are actually needed while a job is processed. CONSTITUTION:When a job is started with an application program where the resources are designated by a JCL, the resources are not allocated, then allocated when an actual access is needed to the resources. In other words, a JCL 2 designates the resources like a printer, a file, etc., which are necessary for execution and is not allocated when the job is started to be able to set the designating information on the access time allocation that designates the allocation when an access is given to the resources. A job control part 3 controls the start and the end of a job and also controls the environment of the resources, etc., needed for execution. Then the part 3 controls the designation, when allocation is instructed at the time of accessing on the JCL 2 in terms of the designated resources, via the resources control tables 4-6 and holds the allocation of resources up to the first access of resources is required. Thus it is possible to prevent the unnecessary occupation of resources and to realize the application of the idle resources to other jobs.

Description

[Detailed Description of the Invention] [Summary] Resource utilization is improved by allocating the resources specified in the job control statement when the resources are actually needed during job processing, instead of allocating them when the job is started. The aim is to improve efficiency.

[Industrial application field]

The present invention relates to a program control method in a computer processing system, and in particular to a job control statement (hereinafter referred to as JCL).
This method relates to a job resource υ1 allocation control method based on the following.

When operating an application program by a user, it is desirable to be able to operate the same program from multiple terminals or to perform double parallel operation without changing the JCL as much as possible, and it is desirable to be able to share and control resources. Is required.

[Conventional technology]

Generally, in an application program that specifies resources necessary for processing using JCL, all of the specified resources are allocated at the time the job is started.

A conventional resource allocation control method will be explained using the example shown in FIG. Figure (a) shows the JC of an application program.
1(b) shows a time chart for job execution.

In Figure (a), JCL includes a printer, file #1. as resources to be used. File #2 is specified respectively.

Here, when the job can be started, as shown in Figure 1(b), +1. In the specified resource printer, file #1. After allocating file #2, the job is started. The process of the started job progresses and the printer is accessed at +'I.

At t2, file #l is accessed.

Then, at t, the zip ends and the printer.

With file 1. Each resource of file #2 is released.

In this example, the printer and file #l are actually used during the input/output processing periods starting at tl and t2, respectively, and file #2 remains unused.

[Problem that the invention seeks to solve]

In conventional computer systems, all the resources specified in the JCL for one application program are allocated when that job starts, so other applications that specify the same resources in the JCL that have been allocated to the preceding job If you have a program and want to start it as a job, you cannot start it until the preceding job finishes because its resources are exclusive by the preceding job.

For example, if there is an application program that uses printers and files, and those resources are specified in JCL, for example, frames (job space)
If you are running a job that uses only files in frame 1 and want to start another job that only uses a printer in parallel, you will have to wait for the job in frame l to finish because the printer is exclusive in frame 1. was there.

As another example, regarding the application program in the above case, if you want to perform a task that uses only files in a system that is not connected to a printer, it is not possible to allocate one of the resources necessary for starting the job, so the JCL Make changes to cancel the printer specification in
After completing the work, it was necessary to restore the resource specifications on the JCL.

In this way, in conventional systems, when starting a job,
Since it was absolutely necessary to completely allocate the resources specified on the JCL, there were some inconveniences in system operation.

[Means for Solving Problems] 7 The present invention is capable of starting a job for an application program for which resources are specified in JCL without allocating resources, and when it becomes necessary to actually access the resources. By allocating resources in this way, unnecessary occupation of resources can be avoided, and resources can be used for other jobs while they are in an empty state.

FIG. 1 shows three principles of the present invention.

In FIG.

1 is an application program.

2 is a job control statement JCL. Specify resources such as printers and files required for execution.

In particular, in the present invention, it is possible to set access-time allocation designation information that specifies allocation at the time of resource access, rather than allocation at the time of job startup. D'! ='! represents this specified information.

Reference numeral 3 denotes a job management unit, which controls starting and ending of jobs, and also manages the environment such as resources necessary for execution. In particular, in the present invention, when there is an access allocation specification for a specified resource on the JCL, this is stored in the resource management table (described later).
resource allocation and suspends resource allocation until the first resource access request.

4 to 6 are resource management tables, which are provided for each resource such as a printer or file, and display information such as whether the resource is waiting for allocation or allocated when the resource is accessed, and other information for each job ID (identification name) that specifies the resource. Information is registered.

7 is a resource access control unit for accessing resources such as printers and files.

8 is a printer.

9 is file #1.

10 is file #2.

[Effect]

FIG. 2 is a specific control example for explaining in detail the present invention shown in FIG. Figure (a) shows that in the resource specification on JCL, the specified resources printer and file #1 exemplarily shown in J-Cu2 have I) y
=y specifies the allocation at the time of access.

When the job management unit 3 in FIG. 1 starts a job (hereinafter referred to as job A) that processes the application program 1, the job management unit 3 in FIG. in resource management tables 4 and 5, respectively.

Zip A is set as the job ID, and the access allocation waiting state is first set by the access allocation specification D)""3'.

Next, when job A (application program 1) is executed and there is an access request for the printer or file #1, each access request is transmitted to the resource access control unit 7.

The resource access control unit 7 inquires of the job management unit 3 whether the resource requested for access can be used. The job management unit 3 correspondingly refers to the resource management table corresponding to the resource for which access is requested, and if 2 allocations are possible, updates the allocation waiting state of job A at the time of access to the allocated state, and performs resource access control. The unit 7 is notified of availability.

Furthermore, if the resource for which access is requested has already been exclusively allocated to another job, the job management section 3 notifies the resource access control section 7 that the resource is unusable.

Once the resources specified by job A are allocated by the job management unit 3, access requests to the resources can always use the resources until the job ends.

FIG. 2 shows an example of resource allocation control when the present invention is applied.

In the illustrated example, on the JCL in (a), a printer and a file #l are specified as resources, and an access allocation specification I) y=y is made.

When the job is started here, as shown in the time chart in (b), the printer and file #l are set to an allocation wait state upon access (set in resource management table 4.5 in Figure 1). If these printers and file #1, which are waiting for allocation upon access, are designated as resources by another job (not shown), it is possible to allocate resources thereto. Furthermore, if the access allocation is specified, the access allocation wait state is set once.

Next, when a printer access request occurs during job execution, it is determined whether the printer can be allocated at that time, and if it is possible to allocate 1 printer, the access waiting state is switched to the allocated state (resource resource shown in Figure 1). (setting status of management table 4).

Furthermore, when an access request for file #1 occurs, it is similarly determined whether file #1 can be allocated at that point, and if file #2 can be allocated, the allocation wait state upon access is switched to the allocated state (see Figure 1). Resource management table 5
settings).

Thereafter, the job maintains the state in which resources have been allocated to the printer and file #l, and upon completion of the job, these resource allocations are released.

〔Example〕

FIG. 3 shows an embodiment of a JCL designated resource allocation control method based on the present invention.

In Figure 3, frame 1 and frame 2 are
'Execution frames for job A and job B, respectively.

In this embodiment, when specifying resources, it is possible to specify shared/exclusive attributes as well as allocation at access time. Based on this, job A's JCL includes 5 printers, shared,
Dy-3''' resource is specified, and job B's JC
In L, the resource specification of "printer, exclusive, Dy=y" is performed. Here are the resources that are designated to be shared by multiple zips.

You can assign duplicates to those jobs.

Additionally, resources with exclusive designation can only be allocated to the designated job.

Also illustrated are resource management tables 4-1 to 4-
14 shows more specifically the sequential update status of the printer resource management table 4 in FIG.
11 is the number of pieces of resource designation information registered in the table, 12 is the identification name of the resource designation information, and 13 is the shared/exclusive attribute. Reference numeral 14 indicates a resource allocation mode, where mode 1 indicates a wait-for-allocation mode upon access, and mode 0 indicates a resource-allocated mode.

■ First, start job A in frame 1 and use its JCL
Based on the resource designation of , the Zip A printer is shared as shown in the resource management table 4-1.

Each piece of information in mode 1 is set as information 1, and the number of resource specification information pieces is set to 1.

■ Next, job B is started in frame 2, and based on the resource specification of the JCL, the zip B printer is exclusive as shown in the resource management table 4-2.

Each piece of information in mode 1 is set as information 2, and the designated number of resources is set to 2.

■ Since a printer access request occurred in job A,
Information 1 is referred to in the state of the resource management table 4-2, and when it is identified that it is waiting for allocation at the time of access in mode 1, information 2 is first referred to, and since it is also in mode 1, allocation is made. Judging that it is possible, resource management table 4-
3, the mode of information 1 is changed to mode 0.

That is, a printer is assigned to job A with the shared attribute.

■ Since a printer access request occurred in job B,
Refer to information 2 in the resource management table 4-3. Now if we identify exclusive and mode 1.

Refer to information 1. However, since sharing and mode O are set in information 1, the exclusive condition of zip B is not satisfied, printer assignment is impossible, and job B ends without being able to be executed any further. In this case, information 2 is deleted as shown in the resource management table 4-4.

(Effects of the Invention) According to the present invention, allocation of resources specified in JCL is suspended until the point in time when they are actually accessed. improves usage efficiency.

Throughput can also be increased.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention, FIG. 2 is an explanatory diagram of a control example showing the effect of the present invention, FIG. 3 is an explanatory diagram of an embodiment of resource allocation control according to the present invention, and FIG. 4 is an explanatory diagram of a conventional control example. FIG. 3 is an explanatory diagram of a specific example of resource allocation control. In Figure 1. 1: Application program 2 Nijitsubu control statement JCL 3 Nijitsubu management section 4-6: Resource management table 7: Resource access control section 8: Printer 9: File #1 1O: File #2

Claims (1)

[Scope of Claims] In a computer processing system including a job management unit (3) that allocates resources specified in a job control statement and executes processing of an application program, the resource specification information of the job control statement includes a resource at the time of access. A means for additionally setting allocation specification information is provided, and the job management unit (3) refers to a job control statement when starting a job and determines whether allocation specification information is added to the resource specification information at the time of access. If the resource is identified and access allocation specification information is added, the job is started with the allocation of the corresponding resource suspended, and when an access request for the resource for which the allocation is suspended is generated, the control to allocate the resource is executed. A job control statement specification resource allocation control method.