JP2740572B2 - Program loading method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program loading method for loading a program stored in a program storage device such as a large-capacity magnetic storage device into a main storage device in a computer system. .

[Conventional technology]

FIG. 2 is a block diagram showing a configuration of a computer system employing a conventional program loading method. In FIG. 2, reference numeral 6 denotes a magnetic storage device as a large-capacity program storage device storing a program for processing a transaction input from a line or the like and a file name indicating the program name. The magnetic storage device 6 includes a data section 2 storing a program and a directory section 1 storing a file name and the like. The directory 1 stores information indicating the position and size of the program in the data section 2 in addition to the file name (program name). Further, various other information is stored in the magnetic storage device 6, but has no relation to the program loading process, and thus the description is omitted here. Reference numeral 3 denotes a management main storage device that stores load information paired with a file name of a program for managing the program stored in the magnetic storage device 6. That is, the main storage for management 3 is replaced with the magnetic storage 6
The contents of the directory section 1 are copied in order to quickly search for a file name in the directory section 1 when the program is loaded (process a). 4 is a management main storage device 3
Is a program execution main storage device for storing a program to be executed loaded (process c) from the magnetic storage device 6 according to the load information stored in the storage device (process b).

Next, the operation will be described. When it becomes necessary to load a program in order to process the input transaction, a scheduler program (not shown) searches the contents of the management main storage device 3 to find a target file name (program name), and Get the load information,
A target program to be executed is loaded from the data section 2 of the magnetic storage device 6 to the main memory 4 for program execution.
By such processing, the number of accesses to the magnetic storage device 6 is reduced, and the load processing time is shortened.

[Problems to be solved by the invention]

Since the computer system according to the conventional program loading method is configured as described above, the number of programs registered in the magnetic storage device as a large-capacity program storage device increases and the capacity of the management main storage device also increases. In a computer system with few resources, such as a small computer, there is a problem that the number of executable programs is limited by a relatively small percentage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, suppresses an increase in a main storage device for management, can execute a large number of programs even with a small computer,
Further, even when a file name of a target program to be executed cannot be found in the management main storage device, or when new load information cannot be stored in the management main storage device, the load processing can be speeded up. The aim is to get a loading method.

[Means for solving the problem]

A program loading method according to the present invention stores a target program to be executed from a program storage device (magnetic storage device 6) in which a program and load information paired with a file name of the program are stored. In a program loading method for transferring the load information to the management main storage device 3 and loading the program based on the load information stored in the management main storage device, Load information storage by reading the load information one by one from the storage device and hashing and storing the load information of all the programs so that the load information of the target program to be executed can be obtained by one access. File 5 is created in advance, and when the program is loaded, When the file name of the target program to be executed cannot be found in the storage device, or when new load information cannot be stored in the management main storage device, the load information of the target program to be executed is stored in the load information. A target program to be executed is obtained from a file and loaded into the main memory for program execution based on the load information.

[Action]

When a program load request occurs, the contents of the management main storage device 3 are searched, and when the file name of the target program to be executed is found, the target program to be executed is stored in the management main storage device 3. The program information is loaded from the program storage device to the program execution main storage device 4 according to the load information. On the other hand, if the file name of the target program to be executed is not found in the management main storage device 3, the corresponding load information is obtained from the load information storage file 5, and the target program to be executed is determined by the corresponding load information. The program is loaded from the storage device to the program execution main storage device 4. When new load information cannot be stored in the management main storage device (that is,
Similarly, when the load information storage area of the management main storage device is exhausted), the load information is obtained from the load information storage file, and the target program is loaded into the program execution main storage device based on the load information.

〔Example〕

FIG. 1 is a block diagram showing a configuration of a computer system employing a program loading method according to one embodiment of the present invention. In FIG. 1, components corresponding to those shown in FIG. 2 are given the same reference numerals, and descriptions thereof will be omitted.
In FIG. 1, reference numeral 5 denotes a load information storage file storing all load information paired with the file name of a program stored in a magnetic storage device 6 as a program storage device. The load information storage file 5 is hashed and stored so that load information of a target program to be executed by one access is obtained. The other configuration is the same as the conventional one. However, the capacity of the management main storage device 3 may be smaller than that of the conventional one.

 Next, the operation will be described.

(1) Before starting online processing.

The load information of the program is read one by one from the directory unit 1 of the magnetic storage device 6, hashed, and written into the load information storage file 5 (process f). This process is performed for all programs registered in the directory unit 1.

(2) Online processing.

(A) When a program load request occurs, the contents of the management main storage device 3 are searched, and if a file name of a target program to be executed is found, the load information set as a pair with the file name is obtained. Then, the target program to be executed is loaded from the data section 2 of the magnetic storage device 6 into the main memory for program execution 4 (process c).

(B) If the target program to be executed cannot be found in the management main storage device 3, the content of the load information storage file 5 is read once to obtain the corresponding load information (process d). Then, the target program to be executed is loaded from the data section 2 into the program execution storage device 4 (process c). After that, the file name and load information of the currently loaded program are stored in the management main storage device 3 (process e). As a result, the program that has requested the operation is sequentially registered in the management main storage device 3 from the file name and the load information, and the one that is frequently used is registered with priority. The above-described embodiment can be said to be a simple and reliable method in which the most frequently used programs can be registered without using a statistical selection means for determining which program should be registered in the management main storage device 3.

If the area of the management main storage device 3 becomes full, the load information cannot be registered in the management main storage device 3,
Thereafter, when the same program is requested to be loaded, processing for obtaining the load information from the load information storage file 5 is performed. However, it can be said that it is very small in view of the overall processing time. If such a thing occurs again, the size of the management main storage device 3 needs to be reconsidered. It can be said that the influence is small.

(C) In a computer system that does not perform continuous operation, the management main storage device 3 is reset each time the power is turned off. For this reason, it is possible to flexibly cope with the bias of the execution program according to the season or the month.
Is used very effectively. In the case of managing a matrix having a bias in distribution, such as an execution request of an online processing program, the overall processing can be speeded up and the management table can be reduced by effectively managing the frequent parts.

The basic concept of the program loading method in the above embodiment is to use the bias of the execution programs in online processing. Generally, about 10% of registered programs occupy about 90% of the total number of operations. Tend to For this reason, the management main storage device 3 for managing about 10% of the registered programs controls about 90% of the entire execution programs, thereby speeding up the program reading process. The size of the storage device 3 is reduced.

The program storage device is not limited to a magnetic storage device, and the present invention can be similarly applied to other storage devices.

〔The invention's effect〕

As described above, according to the present invention, the load information of all the programs is read out one by one from the program storage device so that the load information of the target program to be executed can be obtained by one access. A load information storage file that is stored by hashing is created in advance, and when loading the program, the file name of the target program to be executed cannot be found in the management main storage device, or the management main storage device When the new load information cannot be stored in the program, the load information of the target program to be executed is obtained from the load information storage file, and the target program to be executed in the program execution main storage device based on the load information. Is loaded, it is possible to suppress an increase in the size of the main memory for management, and thereby an expensive main memory is used. Reduction of the apparatus also Hakare, can be realized cost reduction, also be a small computer can run multiple programs. In particular, when the file name of the target program to be executed cannot be found in the management main storage device, or when new load information cannot be stored in the management main storage device, the execution of the target program to be executed is stopped. By using the load information storage file in which the load information is immediately obtained by one access, the target load information is obtained by one access from the load information stored in the load information storage file. Since the target program to be executed is loaded based on this load information, the effect that the loading process can be performed at high speed can be obtained even in such a case.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a computer system employing a program loading method according to one embodiment of the present invention;
FIG. 2 is a block diagram showing a configuration of a computer system employing a conventional program loading method. 3 ... Main storage for management, 4 ... Main storage for program execution, 5 ... Load information storage file, 6 ... Magnetic storage (program storage).

Claims (1)

(57) [Claims] When loading a target program to be executed from a program storage device in which a program and load information paired with a file name of the program are stored into a program execution main storage device, the load information is stored in the storage device. In a program loading method for loading the program based on the load information stored in the management main storage device after being transferred to the management main storage device, reading the load information one by one from the program storage device In order to obtain the load information of the target program to be executed in one access, a load information storage file is created in advance by hashing and storing the load information of all the programs. , The file name of the target program to be executed in the management main storage device And if not found, when it becomes impossible to store new load information to the management main memory, the load information of the program to be executed object obtained from the load information storage file,
A program loading method, wherein a target program to be executed is loaded into the program execution main storage device based on the load information.