JPH0325534A - Program abnormality processing method for composite computer system - Google Patents

Abstract

PURPOSE:To prevent a computer from stopping by setting and storing the degree of importance of each processing program and executing the abnormality processing in accordance with the preliminarily set degree of importance at the time of abnormal termination of the processing program. CONSTITUTION:A computer 6 consists of task importance degree setting processing 7 which defines the degree of importance of each task, a task importance degree storage part 8 where this degree of importance is stored, abnormal termination processing 9 which is informed of abnormal termination by an abnormal termination detecting processing 11 to perform the processing of task abnormal termination, and a task (processing program) 10. The degree of importance of the task 10 is preliminarily stored in the task importance degree storage part 8 by the task importance degree setting processing 7; and if the task 10 is abnormally terminated, abnormal termination of the task 10 is detected by the abnormal termination detecting processing 11, and abnormal termination of the task 10 is reported to the abnormal termination processing 9. This processing 9 receives the report of abnormal termination to take out the degree of importance of the task 10 from the task importance degree storage part 8 and performs the processing in accordance with the degree of importance. Thus, the computer is prevented from stopping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a program abnormal termination processing method for a complex computer system.

(Prior Art) FIG. 4 is a flowchart showing a program abnormality processing method in a conventional complex system: in-system. In FIG. 4, 341 is a process for detecting that a processing program (hereinafter referred to as a task) has terminated abnormally. S41
After detecting abnormal termination of the task at step 842, it is determined whether there is a computer in a backup-enabled state.

In a complex computer system, there are computers in normal operation mode and computers in standby mode, and if the computer in operation mode stops, the computer in standby mode is immediately put into operation mode and takes over processing. S4
If it is determined in step 2 that there is a computer in a backup-enabled state, the computer in standby mode is established as an operating mode in step S43, and the processing is continued, and in step 844, the computer in which the abnormal task termination has been detected is stopped. If it is determined in step 842 that there is no computer in a backup-enabled state, the task that ended abnormally is stopped in step S45.

(Problems to be Solved by the Invention) In the conventional program abnormality processing method, the processing shown in FIG. 4 is performed in one abnormal termination, regardless of the cause of the abnormal termination. However, many task abnormalities are temporary, and most of them are resolved by re-execution. Additionally, tasks within the system vary in their importance from the system's perspective, such as those that are important for system operation and those that do not require stopping the computer. A computer outage causes a functional outage and has a major impact on the system.

The present invention has been made in view of the above circumstances, and provides a program abnormality processing method for a complex computer system that can classify and perform program abnormality processing according to the importance of the task and prevent computer stoppages as much as possible. is intended to provide.

[Structure of the invention] (A thousand steps to solve the problem) The process for achieving the above purpose will be explained using the correlation diagram shown in Figure 2. In the present invention, the calculation I16 includes a task importance setting process 7 that defines the importance for each task, a task importance storage unit 8 that stores the importance set by the task importance setting process 7, and a task abnormality. It is composed of an abnormal termination detection process 11 that detects termination, and an abnormal termination process 9 and a task 10 that perform abnormal termination processing upon receiving notification of abnormal termination from the abnormal termination detection process 11.

(Function) The importance of task 1◇ is stored in the task importance storage unit 8 in advance by the task importance setting process 7.

When the task 10 ends abnormally, the abnormal end detection process 11 detects the abnormal end of the task 10, and notifies the abnormal end process 9 of the abnormal end of the task 10. When abnormal termination processing 9 receives notification of abnormal termination, it retrieves the importance of task 10 from task importance storage section 8 and performs processing according to the importance.

(Actual example) Examples will be described below with reference to the drawings.

FIG. 1 is a flowchart illustrating abnormal processing when a task ends abnormally according to the present invention. In FIG. 1, S11 is the same as the task abnormal end detection in the conventional method. In S12, the importance of the abnormally terminated task is checked based on the stored contents of the task importance storage unit 8, and abnormality processing classified into three ranks, for example, is performed. 313 is abnormal processing when a highly important task terminates abnormally. In this case, in order to determine whether the cause is temporary, the task is allowed to be re-executed n times, and if the task terminates abnormally for the nth time, the computer is stopped. Next, 314 is abnormal processing when a task of slightly lower importance ends abnormally. In this case, as in the case of 813, the task can be re-executed n times, and if it terminates abnormally for the nth time, it is checked whether there is a computer in standby mode that can be backed up, and if there is a computer in standby mode, it is Put the computer into operational mode and stop the computer where the task ended abnormally. If there is no computer in standby mode, the task will be stopped. Finally, 315 is abnormal processing when a task of low importance ends abnormally.

In this case as well, the task is allowed to be re-executed n times as in 313 and S14, and the task is stopped if it is abnormally terminated for the nth time. Note that n in the above description is a value of 1 or more, and may be determined depending on the system or task.

FIG. 3 is an explanatory diagram showing the configuration of a composite computer system that performs the flowchart processing shown in FIG. 1. It is composed of an input device 2, a complex computer system 1, and an output device 3. Here, the composite computer system 1 is NO. t
Calculation t114 and No. It is assumed that there are two ntli5 units connected in parallel. In this figure, it is assumed that the first computer 4 is in the operation mode and the second computer 5 is in the standby mode.
Assume that a highly important task terminates abnormally in 1 calculation 1fi4. In this case No. After the 2nd computer 5 makes a mode transition from the standby mode to the operational mode, and the dark 2nd computer 5 is established as the operational mode, the shame 1st computer 4 is stopped. In the conventional method, the above-described abnormality processing was performed regardless of the level of importance. In the present invention, No. Even if a task terminates abnormally on one computer, if the task is not highly important,
It is possible to re-execute the program 11 times, and when the number of abnormal terminations reaches n times, the same process as in the case described above is performed.

By making it possible to re-execute the process until the abnormal termination occurs n times, the composite computer system 1 can now reliably process the data input from the input device 2 and output it to the output device 3.

The more important the role of the complex computer system 1 is, the more important it becomes to improve the operating rate by stopping the computer.

[Effects of the Invention] As explained above, according to the present invention, by performing abnormal termination processing separately depending on the importance of the task, even if a task terminates abnormally, the task can be re-executed until the abnormal termination occurs n times. This made it possible to prevent functional outages and even computer outages as much as possible.

This makes it possible to significantly improve the reliability of the composite computer system.

[Brief explanation of drawings]

Figure 1 is a flowchart explaining the program abnormality handling method for a complex computer according to the present invention, Figure 2 is a correlation diagram of each process to achieve this method, and Figure 3 is a software abnormality handling method using this method. FIG. 4, which is a diagram showing the configuration of a complex computer system, is a flowchart illustrating a conventional software abnormality processing method for a complex computer. 811, 841...Task successful completion detection processing unit 8
12... Task importance level determination unit 813... Abnormal termination processing unit for tasks with high importance S14... Abnormal termination processing unit for tasks with somewhat low importance 315... Abnormal termination processing unit for tasks with low importance Termination processing unit 34
2... Backup CPU presence/absence determining unit 843... Mode change processing unit to backup 7'CPυ operation mode

Claims (1)

[Claims] In the software of a complex computer system, means for setting the importance level for each processing program, means for storing the set importance level for each program, and means for storing the importance level according to the preset importance level when the processing program terminates abnormally. 1. A program abnormality processing method for a complex computer system, comprising: means for performing abnormality processing.