JPH0132540B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a rollout control method in a processing system that controls input/output devices that are not shared by each job step via an IO supervisor. be.

(b) Prior art and problems In the prior art, job step programs (hereinafter referred to as job step programs) are stored in the storage area of a storage device.
When the EXCP macro instruction (abbreviated simply as job step) is issued to the processing system to control the input/output devices necessary for processing, the processing system receives this and sends the command corresponding to that macro instruction to the IO supervisor and executes it. command. When the IO supervisor finishes executing this command, it sends a completion notification back to the processing system, and the processing system finishes executing the EXCP macro instruction.

Therefore, execution time is required from the time the processing system issues the command corresponding to the EXCP macro instruction issued by the job step to the IO supervisor until the IO supervisor sends back notification of the completion of that command. The period belongs to this command (the source of this command).
The rollout of the job step (that issued the EXCP macro instruction) will be delayed.

However, among the commands that the processing system issues to the IO supervisor, there are, for example, control commands that simply move a predetermined position of the magnetic tape in a magnetic tape device to the head position. In the case of a control command that does not involve the transfer of information to or from the storage area of the storage device, the job step to which this command belongs may be rolled out without waiting until the command completion notification is returned, but the job step is not completed. This has the disadvantage that the rollout to provide storage space to high-priority job steps has to wait, which impedes operational speed.

In addition, the rolled out job step
If the command for the EXCP macro instruction ends incorrectly, when the job step that was rolled out by issuing this EXCP macro instruction is rolled in and execution is resumed, the EXCP macro instruction that was issued before rolling out to this job step is The job is only notified of an abnormality in the end of the job step, and thereafter it depends on the processing of this job step.

(c) Object of the invention In view of the above-mentioned drawbacks of the prior art, the present invention
When the supervisor receives a control command that does not involve the transfer of information between the input/output device and the storage area of the storage device, the supervisor must identify it, start executing the control command, and wait for the execution to finish. By sending a termination signal back to the processing system as if its execution had ended, and by later learning about any errors encountered during execution, the processing system can detect the true nature of the actual control command. It is an object of the present invention to provide a rollout control method capable of rolling out a job step (on a storage area) to which a control command belongs without waiting for the end of the job step.

(d) Structure of the Invention The object of the present invention is to provide a processing system having a function of rolling out unnecessary job steps on the storage area of a storage device, by issuing a command to an IO supervisor in response to a request of each job step. In a processing system that controls an input/output device that is not shared by each job step via the IO supervisor, the IO supervisor receives a control command that does not involve the transfer of information between the input/output device and a storage area of a storage device. This is achieved by a rollout control method characterized in that when the control command is executed, an end signal is immediately returned to the processing system without waiting for the end of execution of the control command, and the control command is executed.

(e) Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

The figure is a block diagram of one embodiment of the rollout control method of the present invention.

In the figure, 1 is a processing system, 2 is an IO supervisor, 2-1 is a command control unit, 2-2 is a simulator, 2-3 is an error signal receiving unit, 2-
Reference numeral 4 indicates an error notification section, 3 indicates a channel and input/output device, 4 indicates a rollout control section, and 5 indicates a storage device.

This embodiment shows an example in which the processing system 1 has the IO supervisor 2 and the rollout control unit 4 externally, rather than internally. The operation will be explained below.

When a job step on the storage area of storage device 5 issues an EXCP macro instruction related to input/output devices,
In response to this, the processing system 1 sends the corresponding command A-1 to the IO supervisor 2.

Upon receiving this, the command control unit 2-1 of the IO supervisor 2 determines whether the command involves the transfer of information between the input/output device 3 and the storage area of the storage device 5.

When the command control unit 2-1 determines that the received command is a command that involves the transfer of information as described above, the command control unit 2-1 controls the channel and the input/output device 3 to execute the command, and then executes the command. Returns a command completion notification to the processing system 1, and receives an error signal from the channel and input/output device 3 by the error signal receiving unit 2-3.
When receiving an error signal, the error signal notification section 2-4
sends an error notification to the processing system 1.

However, when the command control unit 2-1 determines that the received command is a control command that does not involve the transfer of information as described above, it controls the channel and input/output device 3 and starts executing the control command. At the same time, this control command is immediately transferred to the simulator 2-2, and a termination notification B-1 of this control command is created and sent back to the processing system 1. When the control command is truly terminated after execution, the termination notification is sent to the simulator 2-2. Please do not send it back. On the other hand, if an error occurs during the execution of this control command and an error signal is received from the channel and input/output device 3 to the error signal receiving section 2-3, the error signal is held in the error signal receiving section 2-3. , when the command control unit 2-1 receives the next command A-2 for the same input/output device 3 as the command (control command) A-1, the command control unit 2-1 sends an error signal notification unit based on the contents of the error signal reception unit 2-3. An error notification is sent from 2-4 to the processing system 1.

The IO supervisor 2 operates as described above in response to commands issued by the processing system 1, so that the processing system 1 can use the rollout control unit 4 to roll out the job step to which the command belongs in the storage area of the storage device 5. When performing a control command, at least for control commands that do not involve the transfer of information between the input/output device 3 and the storage area of the storage device 5, a simulated quick termination notification is received without waiting for a late termination notification after the execution time. Since the rollout can be performed immediately, the time required for the rollout to be executed until the execution of the issued command is completed is reduced.

(f) Effects of the Invention As explained above, the rollout control method of the present invention provides at least the input/output device 3 and the storage device 5.
For control commands that do not involve the transfer of information to or from the storage area, this method effectively reduces the execution time from the perspective of the processing system to 0. Since the command has already been issued, the opportunity and time for rollout execution to wait for the completion of the command are reduced, which has the effect of improving the overall processing capacity of the processing device.

[Brief explanation of drawings]

The figure is a block diagram of one embodiment of the rollout control method of the present invention. In the figure, 1 is a processing system, 2 is an IO supervisor, 2-1 is a command control unit, 2-2 is a simulator, 2-3 is an error signal receiving unit, 2-
Reference numeral 4 indicates an error notification section, 3 indicates a channel and input/output device, 4 indicates a rollout control section, and 5 indicates a storage device.

Claims (1)

[Scope of Claims] 1. A processing system having a function of rolling out unnecessary job steps on a storage area of a storage device, which rolls out unnecessary job steps in a storage area of a storage device by issuing a command to an IO supervisor in response to a request for each job step.
In a processing system that controls an input/output device that is not shared by each job step via an IO supervisor, the IO supervisor receives a control command that does not involve the transfer of information between the input/output device and a storage area of a storage device. , the rollout control method is characterized by immediately sending an end signal back to the processing system and executing the control command without waiting for the completion of execution of the control command.