JPH0340028A - Allocation control system for input/output device - Google Patents

Abstract

PURPOSE:To improve the throughput of a job by declaring the kind of necessary input/output device and the use start time point or the use end time point of its input/output device by a job control statement against a batch job, and allocating the input/output device extending over a job step from its use start time point to the use end time point. CONSTITUTION:An allocator 13 allocates and releases the allocation of an input/output device 16 of a job step unit, and also, and the input/output device 16 extending over a job step. A memory 15 contains an initiator 12, the allocator 13 and a management table 14, and a computer system 18 contains the memory 15, the input/output device 16 and a CPU 17. In such a state, with respect to a batch job thrown into the computer system 18, the input/output device 16 is allocated extending over the job step from the use start time point to the use end time point of a control statement by the allocator 13. In such a way, the throughput of a job can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an input/output allocation control method for efficiently and flexibly using input/output devices in a computer system.

[Prior Art] In a conventional input/output device allocation control method, input/output devices are allocated before the execution of a job step is started, and the allocation is canceled after the execution of the job step is finished. Therefore,
Even if you want to use an input/output device continuously and exclusively in multiple job steps within the same job, there is a control method that releases some allocations at the end of execution of a job step and reassigns them at the start of execution of the 9th job step. It was getting worse.

FIG. 4 is an explanatory diagram showing an example of a job control statement. In the figure, (1) is an input card that constitutes a batch job;
(3) is the step of executing a program named LMN 1, (2) is the step of declaring that LMN 1 uses a magnetic tape device registered in the computer system with the name TAPE, ( 5) indicates the start of the next job step, and is a step in which program LMN2 is started.

(4) is a step in which the use of the magnetic tape is declared.

Therefore, prior to executing the program in step (3), one magnetic tape device is allocated in step (2),
When the program execution in step (3) is finished, one magnetic tape device is deallocated, and then step (3) is completed.
Prior to the execution of step 5), one magnetic tape device is allocated in step (4), and when the program execution in step (5) is completed, the allocation of one magnetic tape device is canceled.

[The problem that the invention attempts to solve! ! i1 In the conventional input/output device allocation control method as described above,
Because input/output devices are allocated for each job step, even if you want to use the same input/output device continuously and exclusively in multiple job steps within the same job, the allocation is canceled at the end of the job step, so other There have been problems in that the right to use the input/output device is taken over by the job, resulting in a reduction in the above-mentioned throughput and an increase in the burden on the operator.

This invention was made in order to solve such problems, and aims to improve the efficient use of input/output devices and jobs that want to use the same input/output device continuously and exclusively in multiple job steps within the same job. The purpose of this study is to obtain an input/output device allocation control method that enables improved throughput.

[Means for Solving the Problems] The input/output device allocation control method according to the present invention provides a job control statement for a batch job that specifies the type of input/output device required and the point at which the input/output device is to be used. An attempt was made to declare the end point and then allocate input/output devices across job steps from the start of use to the end of use.

[Effect 1] This invention improves the throughput of jobs that use the same input/output device continuously and exclusively in multiple job steps within the same job by allocating input/output devices across job steps. let

[Embodiment] FIG. 1 is a block diagram showing the configuration of an input/output device allocation control method according to an embodiment of the present invention. In the figure,
(11) is an input card that constitutes a batch job, (12)
) is an initiator that controls job execution, and (13) is an allocator that allocates and cancels allocation of input/output devices in job step units, and also allocates and cancels allocation of input/output devices across job steps.

(14) is a management table for each input/output device, and (15) is a memory, which includes an initiator (12), an allocator (13), and a management table (14). (18) is a computer system, which includes a memory (15), an input/output device (16>) and a CPU (17).

FIG. 2 is a diagram showing an example of the definition of the type of input/output device for the allocator and the time point at which use of the input/output device begins or ends. In fig.

(20> is the job control statement (2
1> is a job step where a program called RESET is started, (23) is a job step where a program called INPUT is started, (25) is a job step where a program called 0UTPUT is started, and (22) is a device named TAPE. is started from job step (23), (24) is TA
This step indicates that the device named PE ends its use in job step (25). Therefore, T.A.
It is declared that the device named PE will be used continuously from job step (23) to job step (25).

Figure 3 is a flow chart showing the function of the allocator (13).
・It is a diagram.

In the input/output device allocation control method configured as above, it is determined whether or not the device to be allocated in step (sl>) has already been allocated in a preceding job step of the same job. If it is, the allocation process ends; if no allocation has already been made, the process proceeds to step S2, and the input/output device is allocated according to the job control statement. In step (S3), the specification of the job control statement is checked, and if MOUNT is specified, the process bypasses the input/output device deallocation process and proceeds to step (S5), and the input/output device management table (14) indicates this. record,
If MOUNT is not specified, proceed to step (S4),
Deallocate the I/O device. The above makes it possible to allocate input/output devices across job steps.

In the above embodiment, a magnetic tape device is shown as an example of the input/output device in FIG. 2, but other input/output devices may be used and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As explained above, this invention allows input/output devices to be used continuously across job steps.

Even when contention of input/output devices occurs between a plurality of jobs, an unnecessary magnetic tape changing device can be eliminated, which has the effect of reducing the load on an operator and improving job throughput.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram of an input/output device allocation control method according to an embodiment of the present invention, FIG. 2 is an example of a job control statement of the present invention, FIG. 3 is a flowchart of the allocator control function, and FIG. The figure is an example of a job control statement used in a conventional control method. In the figure, (12)...inishek, (13)...
...Allocator, (15)...Memory, (16)...
Input/output device (17)...CPU. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] In a computer system that has a CPU, a storage device, and an input/output device, and in which the input/output device is allocated before the start of execution of a job step and the allocation is canceled after the execution of the job step is completed, the input/output device is allocated across job steps. It has an allocator that allocates and deallocates the input/output devices, and enables the job control statement to define the type of input/output device required and the point at which the input/output device is to be used or terminated. 1. An input/output device allocation control method, wherein the allocator allocates input/output devices across the job steps from the start of use of the control statement to the end of use of the control statement for a batch job.