JPH0652059A - Automatic swap area addition/deletion system - Google Patents

Abstract

PURPOSE:To enable a continuous operation to be performed by automatically adding a swap area when it is in short supply in a computer of virtual memory system provided with the swap area. CONSTITUTION:A swap area acquiring means 4 and a swap area releasing means 5 monitor the quantity of unused swap area of a system by using an unused swap area quantity monitoring means 6, and call an automatic snap area addition/deletion means 7 at need by performing threshold value control, and add by generating a swap file newly when the swap area is in short supply, and delete an added swap area when an excessive swap area exists. Thereby, an operation can be continued without generating a problem even when burden is applied temporarily to a system in which a system manager is absent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swap area management method for a virtual memory type computer system having a swap area in a secondary storage device.

[0002]

2. Description of the Related Art Conventionally, the size of a swap area is determined at system initialization, or a system administrator inputs a command to add / delete a file in secondary storage as a swap area to create a swap area. Had changed the size of. The swap area is a secondary storage device that temporarily copies the contents of the physical memory when the amount of memory that is virtually used in the virtual storage system becomes larger than the physical memory amount. The physical memory area, which is the upper area and whose contents are copied to the swap area, can be used for other purposes.

[0003]

The above-mentioned conventional swap area management method has a drawback that a new job cannot be executed when the load becomes high and the swap area becomes insufficient in a system without a system administrator. . In a system where the load is concentrated in a very short time and the swap area is not used so much at other times, in order to prevent a situation in which jobs cannot be executed, it is necessary to There is a drawback that the required swap area amount must be secured from the beginning, and the efficiency of use of the secondary storage device in normal times deteriorates.

In view of the above-mentioned problems, the present invention adds a swap area when the unused swap area becomes small, and automatically deletes an unnecessary swap area when the area becomes large so that a secondary storage device can be obtained. It is an object of the present invention to provide a swap area automatic addition / deletion method that can effectively use the free area of the.

[0005]

According to the swap area automatic addition / deletion method of the present invention, in a virtual storage system computer system having a swap area in a secondary storage device, when the remaining swap area becomes small, A feature is that a new swap area is automatically added to the system by using a swap area acquisition means, an unused swap area amount monitoring means, and a swap area automatic addition / deletion means.

When the remaining swap area becomes sufficiently large, the swap area released means, the unused swap area amount monitoring means, and the swap area automatic addition / deletion means are used to automatically add the swap area already added. It is characterized by being deleted from the system.

[0007]

According to the above construction, the swap area acquisition means and the swap area release means use the unused swap area amount monitoring means to check the unused swap area amount of the system, and use the swap area automatic addition / deletion means. When the remaining swap area becomes small, the swap area is automatically added, and when the remaining swap area is sufficiently large, the added swap area is automatically deleted. The free area of the device can be effectively used.

[0008]

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

FIG. 1 is a diagram showing the configuration of the present invention.

In FIG. 1, swap area use processing 1
(1), swap area use processing 2 (2) and swap area use processing 3 (3) represent jobs that use the swap area. Each job uses the swap area acquisition means 4 to acquire and use the swap area. Then, the swap area releasing means 5 is used to release the used swap area. The swap area acquisition means 4 and the swap area release means 5 use the unused swap area amount monitoring means 6 to check the unused swap area amount, and if necessary, use the swap area automatic addition / deletion means 7 to check the swap area. Add / delete. Note that it is assumed here that there is already a function of externally designating a swap area and adding / deleting it. Also, the swap area is an area that occupies a certain size on the secondary storage device, and the structure or form of the swap area does not matter. Therefore, the swap area may occupy a continuous area on the secondary storage device, or may be a unit called a logically organized file.

Next, the operation will be described.

FIG. 2 is a flow chart showing the flow of processing of the unused swap area amount monitoring means. Referring to FIG. 2, the unused swap area amount monitoring means 6 first updates the data area storing the unused swap area amount (S-2
1), the process is divided according to whether it is acquired or released (S-2
2). In the case of acquisition, if the amount of unused swap area is less than the preset threshold value (S-23), the swap area automatic addition / deletion means 7 is called (S-25). The threshold may be set in advance or may be automatically adjusted according to the situation, and is not specified here. In the case of release, the swap area automatic addition / deletion means 7 is called (S-25) only when the unused swap area amount changes from less than twice the threshold value to more than twice the threshold value (S-24). Here, for the sake of simplification, the criterion of the determination is twice the threshold value, but the use of another criterion does not depart from the scope of the present invention. In this way, the unused swap area amount monitoring means 6 makes it possible to call the swap area automatic addition / deletion means 7 when the unused swap area amount becomes small and when it becomes sufficiently large. .

FIG. 3 is a flowchart showing the processing flow of the swap area automatic addition / deletion means. Referring to FIG. 3, the swap area automatic adding / deleting means 7 first checks whether or not the amount of unused swap area is less than a threshold value (S).
-31). If it is less than the threshold value, first, a swap file to be added as a swap area is created on the secondary storage device (S-32). Next, the created swap file is additionally registered as a swap area (S-33). Then, the process returns to the first condition judgment (S-31) and is repeated until the unused swap area amount becomes equal to or more than the threshold value. If the amount of unused swap area is equal to or larger than the threshold value in the first condition judgment (S-31), it is checked whether the amount of unused swap area is equal to or larger than twice the threshold value (S-34). When the amount of unused swap area is more than twice the threshold value, the swap area added so far is released (S-35) and the swap file on the corresponding secondary storage device is deleted (S-3).
6). Then, the process returns to the first condition judgment (S-31). Note that the automatic swap area adding / deleting means 7 does not depart from the scope of the present invention no matter how the criteria for condition determination are determined.

[0014]

As described above, the present invention guarantees the normal operation of the system as much as possible in a system without a system administrator by adding a swap area when the unused swap area becomes small. The effect and the effect that the free area of the secondary storage device can be effectively used by automatically deleting the added swap area that has become unnecessary because the unused swap area becomes large.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a swap area automatic addition / deletion method according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing flow of an unused swap area amount monitoring means shown in FIG.

FIG. 3 is a flowchart showing a processing flow of a swap area automatic addition / deletion means shown in FIG.

[Explanation of symbols]

 1 Swap Area Use Processing 1 2 Swap Area Use Processing 2 3 Swap Area Use Processing 3 4 Swap Area Acquisition Means 5 Swap Area Release Means 6 Unused Swap Area Amount Monitoring Means 7 Swap Area Automatic Addition / Deletion Means 8 Control Unit

Claims (2)

[Claims] 1. A virtual memory type computer system having a swap area in a secondary storage device, wherein when a remaining area of the swap area becomes small, a swap area acquisition means and an unused swap area amount monitoring means, A swap area automatic addition method characterized in that a new swap area is automatically added to the system by using a swap area automatic addition / deletion means. 2. The system according to claim 1, wherein when the remaining swap area becomes sufficiently large, a swap area releasing means, an unused swap area amount monitoring means, and a swap area automatic adding / deleting means are used. Automatic swap area deletion method, which automatically deletes the added swap area from the system.