JPH0559537U - calculator - Google Patents

Abstract

(57) [Abstract] [Purpose] By compressing the data saved in the auxiliary storage device when the memory is insufficient, a free area can be secured in the memory and the number of times the data is saved to the auxiliary storage device can be reduced. Since the data is compressed, the transfer size of the data to the auxiliary storage device is reduced, and high-speed s
Obtain a computer that can implement the wap process. [Effect] Speed-up of swap processing when memory is insufficient.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a computer having a memory management mechanism.

[0002]

[Prior Art]

 FIG. 3 shows the contents of the correspondence between the logical address and the physical address of the process described in P290 to P296 of "Makoto Ikushima: Memory management technique of UNIX 4.2 BSD, Interface, Vo1.11, No.8, 1985". Is shown in the block diagram. In the figure, 1 is an electronic computer main body, 2 is an operating system for managing computer resources, and 3 is a resource reserve from a user. 1A indicates a main memory of the computer, and 1B indicates an auxiliary memory of the computer. 2A indicates a main memory management mechanism in the operating system, and 2B indicates a task (usually called swapper) which is started when the main memory is insufficient and saves the data in the main memory to the auxiliary memory. FIG. 4 is a flowchart showing a processing procedure of processing (2A, 2B) in the operating system 2 of the computer in FIG.

Next, the operation will be described. A schematic procedure of the conventional swap process shown in FIGS. 3 and 4 will be described. When a user requests execution of a process (almost synonymous with task) (1) and the free area of main memory 1A is insufficient (A1), operating system 2 starts swapper2B (B1), The process of using the device 1A is retracted to the auxiliary storage device 1B (B2), the free area of the main storage device 1A is secured, and the process is executed (D1). The saved process is managed by swapper2B, and when a sufficient free area is secured in main memory 1A, it is read from auxiliary memory 1B to main memory 1A and execution is resumed.

[0004]

[Problems to be solved by the device]

 Since the conventional virtual memory processing is configured as described above, it is necessary to save the contents of the memory to the auxiliary storage device when the memory is insufficient, and it is necessary to perform I / o with the auxiliary storage device. .. However, there are problems that the I / o speed of the auxiliary storage device is slow and the data to be saved is large.

The present invention has been made to solve the above problems, and secures an empty area in the memory by compressing the data saved in the auxiliary storage device when the memory is insufficient. , The number of times data is saved to the auxiliary storage device can be reduced, and because the data is compressed, the transfer size of the data to the auxiliary storage device is reduced, and a computer capable of realizing high-speed swap processing is obtained. The purpose is to

[0006]

[Means for Solving the Problems]

 The computer system according to the present invention is provided with a means for compressing data when the memory is insufficient and a means for swapping the compressed data to the auxiliary storage device.

[0007]

[Action]

 The swap according to the present invention compresses the data on the memory when the memory is insufficient, thereby creating an empty area on the memory and solving the memory shortage.

[0008]

【Example】

 Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing an embodiment of the present invention. In the figure, 1 is an electronic computer main body, 2 is an operating system for managing computer resources, and 3 is a resource reserve from a user. 1A indicates a main memory of the computer, and 1B indicates an auxiliary memory of the computer. 2A is the main memory management mechanism in the operating system, 2B is the task that is started when main memory is insufficient, and saves the main memory data to the auxiliary memory (usually called swapper), and 2C is Indicates the data compression function. FIG. 2 is a flowchart showing a processing procedure of processing (2A, 2B, 2C) in the operating system 2 of the computer in FIG.

Next, the operation will be described. A first embodiment of the present invention will be described below with reference to FIGS. When a user requests execution (1) of a process (which is almost synonymous with task) and the free area of the main storage device 1A is insufficient (A1), the operating system 2 starts swapper2B (B1). swapper2B checks if there is any uncompressed process data (C1). If there is an uncompressed process, the process image in the main memory is compressed using the compression function 2C (C2). As a result, an empty area is created in the main storage device 1A. After compression, execute (A1) again to check the free area in the main memory. If there is a free area here, the program is read into the main memory (A2) and the program is executed (D1). If there is no free area, swapper2B is started again (B1) and the process is repeated. If there is no uncompressed process data (C1), swapper (2B) saves the low-priority process to auxiliary storage 1B (B2) and secures a free area in main storage 1A. Execute the process (D1). The saved process is managed by swapper (2B), and if a sufficient free area is secured in main memory 1A, it is read from auxiliary memory 1B to main memory 1A, and after decompressing compressed data, execution resumes. To be done.

[0010]

[Effect of the device]

 As described above, according to the present invention, since the data compression is added to the swap process, the I / o to the auxiliary storage device is reduced when the memory is insufficient, and the process can be executed at a stable speed even when the memory is insufficient. .. Further, since the memory and the auxiliary storage device are effectively used, the storage capacity can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the present invention.

FIG. 3 is a schematic block diagram showing an example of a conventional computer.

FIG. 4 is a flowchart showing a processing procedure of a conventional computer.

[Explanation of symbols]

 1 Computer main body 2 OS 3 User request

Claims (1)

[Scope of utility model registration request] 1. A computer provided with a memory management that secures a memory, a swapper that saves the memory contents to a disk and secures the memory when the memory is insufficient, and a driver that has a function of compressing the memory contents.