JPH04365141A - Program re-execution system - Google Patents

Abstract

PURPOSE:To reduce the data volume to be saved by saving only updated pages in the save processing for re-execution of a program. CONSTITUTION:When the program of an electronic computer system is halfway executed again, only updated pages are saved by an updated page management means 2 and an updated page save means 3 after the state of the program is saved once by a program save means 1. The save processing of the program is performed without changing the program by an execution time monitor means 4 and an instruction step monitor means 5. Thus, the overhead for program save is reduced, and the program is not changed to perform the save processing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a re-execution means used in a computer system when a program needs to be re-executed due to abnormal termination of the program.

0002

2. Description of the Related Art In the prior art, when saving the state of a program in order to re-execute the program, the entire program is saved every time the program is saved. Furthermore, when saving a program, it was necessary to change the program.

0003

[Problems to be Solved by the Invention] In the conventional technology, when saving the state of a program, the entire program is saved each time it is saved, resulting in a large overhead.

An object of the present invention is to provide a program re-execution method that can reduce overhead by saving only updated pages once they have been saved. Furthermore, by setting the timing for saving updated pages not only according to instructions from the program, but also for each time or number of instruction steps, it is possible to provide a program re-execution method that allows saving without modifying the program. It is.

[0005]

[Means for Solving the Problems] The first aspect of the present invention is to provide a program save means for saving all pages of a program being executed in an electronic computer system, and updating each page in the program from the time the program is saved. an updated page management means for managing the state of the updated page, an updated page saving means for saving updated pages, a program loading means for loading the contents saved by the program saving means, and the contents loaded by the program loading means. and an update page load means for restoring the content saved by the update page save means to the point in time when the update page was saved, and a program restart means for executing the program from the restored state. This is a re-execution method.

[0006] A second aspect of the present invention is a computer system that includes program save means for saving all pages of a program being executed, and managing the update status of each page in the program from the time the program is saved. an updated page management means; an updated page saving means for saving updated pages; an execution time monitoring means for monitoring program execution time and instructing program saving and updated page saving; a program loading means for loading contents; an update page loading means for restoring the contents loaded by the program loading means and the contents saved by the updated page saving means to the point in time when the updated page was saved; This is a program re-execution method characterized by having a program restart means for executing the program from the state.

Furthermore, a third aspect of the present invention is a computer system that includes program saving means for saving all pages of a program being executed, and managing the update status of each page in the program from the time when the program is saved. An updated page management means, an updated page saving means for saving updated pages, an instruction step monitoring means for monitoring the number of instruction steps executed by a program and instructing to save the program and an updated page, and the program saving means. a program loading means for loading the saved content; an update page loading means for restoring the content loaded by the program loading means and the content saved by the update page saving means to the point in time when the update page was saved; This is a program re-execution method characterized by comprising a program restart means for executing the program from a restored state.

[0008]

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram illustrating an embodiment of the present invention.

[0010] In this embodiment, a program save means 1;
updated page management means 2, updated page saving means 3,
It consists of an execution time monitoring means 4, an instruction step monitoring means 5, a program loading means 6, an update page loading means 7, a program restarting means 8, an execution program 9, and a secondary storage device 10.

[0011] The program save means 1 saves the entire page of the program in a secondary storage device, making it possible to restart the program.

[0012] The updated page management means 2 manages the numbers of pages that have been updated since the time when they were saved by the program saving means and the updated page saving means 3.

[0013] The updated page saving means 3 saves the contents of the page managed by the updated page managing means in a secondary storage device.

Execution time monitoring means 4 monitors the execution time of the program and instructs to save the program and save updated pages.

The instruction step monitoring means 5 monitors the number of instruction steps executed by the program and instructs to save the program and save updated pages.

The program loading means 6 loads the contents saved by the program saving means and enables the program to be re-executed.

The update page loading means 7 restores the state of the program at the time when the update page was saved, from the contents loaded by the program load means and the contents saved by the update page save means.

The program restart means 8 restarts the program from the state restored by the update page load means.

The execution program 9 is a program to be executed.

The secondary storage device 10 is a large capacity storage device such as a magnetic disk.

FIG. 2 is a flow diagram illustrating the scheme of the present invention.

The flowchart shows program execution processing 21;
Program end determination 22 and update page management processing 23
, program save instruction 24 , and execution time monitoring 25
, execution step monitoring 26 , save count determination 27 ,
Program save processing 28 and updated page save processing 2
9, re-execution determination 2A, program load processing 2B, update page load processing 2C, and program restart processing 2
Consists of D.

Next, the operation of this embodiment will be explained in detail.

A program execution process 21 executes instructions in the program. After the instruction is executed, a program end determination 22 determines whether the program is complete. At this time, if there is no cause for termination such as program termination or abnormal termination, update page management processing 23 is performed. In the updated page management process, if there is a page updated by executing the program, the page number of the updated page is registered. In the program save instruction 24, if there is a save instruction from the program, the save number judgment 27
I do.

The instruction to save the program can also be given by the execution time monitor 25. In this case, when the program consumes a predetermined execution time, an instruction to save the program is issued, and the number of saves is determined 27.

Furthermore, the instruction to save the program can also be given by the execution step monitor 26. In this case, when the program has executed a predetermined number of instruction steps, a save instruction for the program is issued, and the number of saves is determined 27.

If there is no instruction to save the program, the process returns to program execution processing 21.

In the save count determination 27, the number of times a program save instruction has been issued is determined, and if it is the first time, program save processing 28 is performed. If it is the second or subsequent time, update page save processing 29 is performed.

In program save processing 28, all pages of the program are saved in the secondary storage device. Thereafter, the process returns to the program execution process 21.

In the updated page save processing 29, an instruction to save the previous program is given, and pages updated since the last time the program was saved are saved in the secondary storage device. Thereafter, the process returns to the program execution process 21.

On the other hand, if the program termination determination 22 determines that the program has ended, a re-execution determination 2A is performed. In the re-execution determination, if there is no need to re-execute, the process ends.

If re-execution is necessary, program load processing 2B is performed. In the program load process, the state of the program is loaded from the contents saved in the secondary storage device by the program save process. In the update page load process 2C, the state at the time the update page was saved is restored from the content loaded by the program load process and the content saved by the update page save means.

[0033] After that, by program restart processing 2D,
Resume program execution from the restored state.

[0034]

[Effects of the Invention] As explained above, in the present invention, in order to re-execute the program from the middle, only updated pages are saved in the process of saving the program state in the secondary storage device during program execution. This reduces the overhead required for saving.

Furthermore, since the save timing can be determined depending on factors such as the execution time and the number of executed instruction steps, it is possible to re-execute the program without changing the program.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the method of the present invention.

[Explanation of symbols]

1 Program save means 2 Update page management means 3 Updated page saving means 4 Execution time monitoring means 5 Command step monitoring means 6 Program loading means 7 Update page loading means 8 Program restart means 9 Execution program 10 Secondary storage device 21 Program execution processing 22 Program end determination 23 Update page management process 24 Program save instruction 25 Execution time monitoring 26 Execution step monitoring 27 Save count determination 28 Program save processing 29 Updated page save process 2A Re-execution judgment 2B Program load processing 2C Update page load processing 2D Program restart processing

Claims (3)

[Claims] 1. In a computer system, a program save means for saving all pages of a program being executed; an updated page management means for managing an updated state of each page in the program from the time of saving; an updated page saving means for saving updated pages;
A program loading means for loading the contents saved by the program saving means, and an update for restoring the contents loaded by the program loading means and the contents saved by the updated page saving means to the point in time when the updated page was saved. A program re-execution method characterized by comprising a page load means and a program restart means for executing the program from a restored state. 2. In a computer system, a program save means for saving all pages of a program being executed; an updated page management means for managing an update state of each page in the program from the time when the program was saved; an updated page saving means for saving updated pages;
Execution time monitoring means for monitoring program execution time and instructing program save and update page save; Program loading means for loading the contents saved by the program saving means; and Contents loaded by the program loading means. A program comprising an update page load means for restoring the contents saved by the update page save means to the point in time when the update page was saved, and a program restart means for executing the program from the restored state. Rerun method. 3. In a computer system, a program save means for saving all pages of a program being executed; an updated page management means for managing an update state of each page in the program from the time when the program was saved; an updated page saving means for saving updated pages;
instruction step monitoring means for monitoring the number of instruction steps executed by the program and instructing program save and update page save; program loading means for loading the contents saved by the program saving means; The present invention is characterized by comprising an update page loading means for restoring the updated page to the point in time when the updated page was saved from the content saved by the updated page saving means, and a program restarting means for executing the program from the restored state. , program re-execution method.