JPS6111861A - Program access control system - Google Patents

Abstract

PURPOSE:To start the execution of a program module high in using frequency immediately when the starting command of the program module is issued by rearranging entries of a directory in the descending order at a prescribed timing on the basis of the information of access frequency. CONSTITUTION:An electronic computer 4 includes a system program and a magnetic disc mounted in a magnetic disc device 5 stores a program library. At the loading of a program module, the number of accesses is written in a directory entry corresponding to the program module and the entries in the directory are rearranged in the descending order at the prescribed timing on the basis of the number of accesses so that the directory entry corresponding to the program module having the highest using frequency is arranged on the leading position of the directory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a computer system in which programs are stored on a disk volume, in which entries in a directory that records the location of program libraries are set according to the usage frequency of the program. The present invention relates to a program access method that dynamically rearranges and manages frequently used program modules, thereby reducing search time for frequently used program modules.

[Prior art and problems]

Figure 5 is a diagram showing the structure of the program library, where 1 is a file label, 2 is a directory, A and B
shows the program P-grams respectively. Program libraries are stored on disk volumes. 6th
The figure shows the structure of the conventional directory 2,
ET indicates a directory entry. The directory 2 is composed of one or more entries ET. The entry ET consists of a member name and a relative address for specifying the storage location on the disk volume of the member (synonymous with a program module) identified by the member name.

In the prior art, when loading a desired program module stored in a program library onto the main memory, one entry is first read from the beginning of the directory 2.0, and the desired program name is written in it. If an entry with a program name that matches exists, the desired program is read from the program library based on the relative address of that entry, expanded in main memory, and If there is no entry with a program name that matches the desired program name, the next four entries are read and the same process is performed.

In the prior art as described above, for example, if program module n shown in FIG. 6 is the most accessed one, m searches are always required to find the storage location of program module n. There is a drawback that it takes a long time from when program module n is specified to start until execution of program module n starts.

[Purpose of the invention]

The present invention aims to eliminate the above-mentioned drawbacks by providing a program access management method in which execution of frequently used program modules is immediately started when a startup instruction is issued. The purpose is

[Means to achieve the purpose]

For this reason, the program access management method of the present invention provides a computer system in which a program library consisting of directories and program modules is stored on a disk volume. In addition to writing relative address information indicating the location on the disk volume where the is stored and access count information, the access count of the corresponding directory entry is written when loading the program module in the program library onto main memory. This method is characterized in that the information is increased by a unit amount, and the entries in the directory are rearranged in descending order based on access count information at a predetermined timing.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram for explaining the structure of a directory and the rearrangement of directory entries according to the present invention.

The directory entry ET according to the present invention is composed of a member name, relative address information for specifying the storage location on the disk volume of the program module specified by the member name, and access count information. The access count information of the directory entry is incremented by 1 each time the program module specified by the member name is loaded onto the main memory.

For example, after a certain period of time, the contents of the directory 2 are rearranged in descending order so that directory entries with larger access count information are positioned at the top. In Figure 1, it is assumed that member 1' has the largest number of accesses (, member 2' has the second largest number of accesses, and member 3' has the third largest number of accesses. Note that the directory - The entries may be rearranged when the system is powered on or when there is no running vehicle.

FIG. 2 shows an overview of the system configuration of the present invention. In Figure 2, '3 is the console, 4 is the computer, and 5 is the console.
indicate magnetic disk devices. The electronic computer 4 has a built-in system program, and a program library is stored on a magnetic disk mounted on a magnetic disk device. When an operator inputs a command to execute program module n from the console 3, the program module n specified by the command is extracted from the program library under the control of the system program, expanded into the main memory, The program' module n is executed, and when the execution of the program module n is completed, the program name module n is also ejected from the memory.

FIG. 3 is a flowchart for explaining program access processing according to the present invention. Note that this processing is performed by a system program.

■ When the operator instructs you to start a program module, the program module is started by referring to the VTOC.
Know where the library is stored.

■ Read four directory entries from the program library directory.

■ The program file for the directory entry read.
Check module name.

(2) If the desired program name exists, process (2) is performed; if it does not exist, process (2) is performed.

■ The following 4 files from the program library directory.
Reads the directory entries and returns to the process in step (■).

■ Add 1 to the access count information of the directory entry whose program name matches the desired program module name.

■ Find out the storage location of the desired program module from the relative address of the directory entry.

■ Extract the desired program module from the program library and expand it onto main memory.

■ Execute the program module expanded into main memory.

FIG. 4 is a diagram for explaining directory update processing according to the present invention. This processing is also performed by the system program.

■ Locate the program library using VTOC, check the file label of the program library, and confirm that it is the desired program library.

■ READ program library directory
do.

■ Sort the contents of the directory in descending order so that directory entries with larger access count information are at the top.

■ Reflect the rearrangement in ■ to the program library directory on the disk volume.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when loading a program module, the number of accesses is written to the corresponding directory entry, and at a predetermined timing, the entries in the directory are sorted in descending order based on the number of accesses. The directory entry corresponding to the most frequently used program module is positioned at the beginning of the directory, which allows the computer to be used more effectively and gives the operator the feeling that the program starts running slowly. You can prevent it from happening.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the directory structure and rearrangement of directory entries according to the present invention, FIG. 2 is a diagram showing an overview of the system configuration of the present invention, and FIG. 3 is a diagram for explaining the program access processing according to the present invention. FIG. 4 is a diagram for explaining the directory update process according to the present invention, FIG. 5 is a diagram showing the configuration of a program library, and FIG. 6 is a diagram showing the conventional directory configuration. It is. 1...File label, 2...Directory, 3
...Console, 4.Computer, 5.Magnetic disk device. Patent Applicant: Usatsuk Electronic Industry Co., Ltd. Representative Patent Attorney: Kyotani, Part 4, Figure 2, Figure 3

Claims (1)

[Claims] In a computer system in which a program library consisting of a directory and program modules is stored on a disk volume, a directory entry contains a program module name and a relative value indicating the location on the disk volume where the corresponding program module is stored. In addition to writing address information and access count information, the program in the program library
The feature is that when loading a module onto the main memory, the access count information of the corresponding directory entry is increased by a unit amount, and at a predetermined timing, the entries in the directory are rearranged in descending order based on the access count information. A program access management method that