JPH03129436A - Virtual storage control system corresponding to job priority - Google Patents

Abstract

PURPOSE:To suppress the delay of response time of a job as far as possible by securing secondary medium areas with different input/output performance corresponding to the priority of the job. CONSTITUTION:When the job 63 chained to a schedule awaiting queue 40 is executed, a secondary area securing processing part 13 allocates disk devices 70-90 for memory information saving with different input/output performance corresponding to the priority of the job after loading a program executed at the job 63 with a job execution control processing part 50 on a memory. When no null memory required for execution is secured, a job selection processing part 14 searches the job chained to a ready queue 30, and selects the job that can be saved and with low priority, and memory information is saved to the disk devices 70-90 allocated corresponding to the priority with a secondary medium recovery processing part 15. Thereby, control can be performed without generating the delay of the response time of the job due to saving to a secondary medium.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control method when saving memory resources of a job to a secondary medium, and in particular to a secondary medium area where input/output performance according to job priority is stored. This invention relates to a virtual memory control method that secures job response time and suppresses job response time delays as much as possible.

[Prior Art] In a conventional operating system, as a virtual memory control method for securing free memory, there is a means for selecting a job with a low job priority that can be saved. However, this control method does not manage the level of secondary media areas according to input/output performance, so regardless of the priority of the job, secondary media with the same performance is secured and virtual memory control is executed. .

[Problems to be Solved by the Invention] In the conventional control method described above, secondary media for evacuation determined in advance at the time of system generation are not managed to secure secondary media for each input/output performance commensurate with job priority. Since the virtual memory is secured equally, the virtual memory control ignores the priority of the job, which has the drawback of significantly delaying the response time of the job.

[Means for Solving the Problems] A virtual memory control method according to the present invention utilizes a host computer having a virtual memory control function, and controls the installed memory and operations owned by the computer in a general job running under a general-purpose operating system. When another job with higher priority than the current job is applied and tries to operate,
If the memory space necessary for the job to run is insufficient, the memory resources for the job can be stored in advance on a secondary medium (for example, a disk device) that can be saved in page units, depending on the input/output performance. A means for area management that gives a certain level and is commensurate with the response time considering the priority of the job, and a method that has a lower priority than the jobs currently waiting for execution among the currently running jobs, has memory resources, and A means for selecting a job whose memory resources can be saved to the secondary medium, and a job that has input/output performance at a level commensurate with the priority of the job when securing memory resources for the job when saving to the secondary medium. The method is characterized in that it includes a means for securing an area, and controls response delay time of a job due to being saved to a secondary medium without impairing it as much as possible.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 shows details of the secondary medium performance information 11 created by the area management processing section 12 shown in FIG.

In FIG. 1, a host computer 1 includes a virtual storage control processing section 101 and a human output control processing section 20. The virtual memory control processing unit 10 stores performance information 11. Area management processing unit 12 when initializing and securing 5 area of secondary medium for saving memory information and releasing 5. Secondary area securing processing unit for securing and releasing a secondary medium area for saving memory information at the time of job execution and termination 13. Job selection processing unit 14 for jobs that can be saved to secondary media according to job priority. It includes a processing unit 15 that performs control of evacuation and recovery to an actual secondary medium. The input/output control processing unit 20 performs input/output control processing for disk devices, etc., 30 is a job ready queue, 40 is a job schedule waiting queue, and 50 is a job execution 1 wholesale process 261 to 63 in the host computer 1. Jobs 70 to 90 to be executed are disk devices for saving memory information, and each device has a different input/output performance.

Examples will be shown below according to each figure.

(1) Performance information and area initialization processing When the operating system is started up, initial settings of the area management processing unit 12 are executed. In the initial settings, a map information area is secured according to the physical information of the disk device defined at the time of system generation, and the physical device address and free space information are initialized as block information, leaving it in an unused state.

(2) Job 6 chained in end area reservation processing schedule waiting queue 40 during job execution
3, after the job execution control processing unit 50 loads the program to be executed in the job 63 onto the memory, the secondary area reservation processing unit 13 is executed to secure the secondary area corresponding to the secured memory. call Secondary area securing processing unit 1
In step 3, process the secondary media area that matches the requested size (1)
Extract the secondary medium performance information 11 created in . At this time, a secondary medium with a rank according to the priority of the job is assigned,
It is associated with memory information.

(3) Secondary medium saving process If the free memory necessary for executing the job 63 currently in the schedule waiting queue 40 cannot be secured, the job execution control processing unit 50 can save the job to a secondary medium. The job selection processing unit 14 is called in order to select a suitable job. The job selection processing unit 14 searches for jobs chained in the ready queue 30 (or other queues) and selects a job that can be saved and has a low priority (here, 62).

In the job 62, memory information and secondary medium block information have already been associated in process (2), and the virtual memory control processing unit 10 sends memory information that has not been accessed for a certain period of time to the secondary medium evacuation and recovery processing unit 15. By calling , the memory information is saved in the disk devices 70 to 90 allocated according to the priority, and the free memory necessary for executing the job 63 is controlled by increasing the free memory.

(4) Secondary medium recovery processing When the job 62 whose memory information has been saved to the secondary medium starts operating and approaches the saved memory information, an access exception occurs and the secondary medium saving and recovery processing unit 15 is notified. As a so-called virtual memory control mechanism, memory is re-allocated and the saved information is restored.

The input/output time required for the evacuation and recovery processing at this time is given a performance difference depending on the priority of the job, and the control processing is such that the response time is not delayed as much as possible.

[Effects of the Invention] As described above, the present invention has advantages for allocating memory information and a secondary medium area for saving during job execution.

By allocating devices with different input/output performance depending on the priority of the job, it is possible to reduce the factor that delays job response time due to the input/output time required to save/recover memory information due to system circumstances when memory is overloaded. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of the present invention, and FIG. 2 is a detailed diagram of secondary medium performance information. DESCRIPTION OF SYMBOLS 1... Host computer, 10... Virtual memory control processing unit, 11... Secondary medium performance information, 12... Area management processing unit, 13... Secondary area reservation processing unit, 14...
- Job selection processing unit, 15...Secondary medium evacuation and recovery processing unit. 20... Input/output control processing unit, 30... Ready queue 40... Schedule waiting queue, 50... Job execution control unit. Figure 2

Claims (1)

[Claims] 1) In a general job that uses a host computer with a virtual memory control function and operates under a general-purpose operating system, the installed memory owned by the computer and the virtual memory space used by the running job In memory threshold control, when another job with a higher priority than the currently running job is applied for and tries to run, the memory space required for that job to run is insufficient. As a secondary medium that can save job memory resources in units of pages in advance, a certain level is given according to input/output performance, and a means for area management commensurate with response time considering job priority. , means for selecting, from among running jobs, a job that has a lower priority than jobs waiting for execution, has memory resources, and whose memory resources can be saved to the secondary medium; and means for securing a backup area with input/output performance at a level commensurate with the priority of the job when securing memory resources for the job, and the response delay of the job due to being saved to the secondary medium. A virtual memory control method according to job priority that is characterized by controlling time with as little loss as possible.