JPH02201656A - Checking system for duplex information processor - Google Patents

Abstract

PURPOSE:To check contents correspondence by means of program running by providing a memory update mechanism, and comparing the memory contents of a processing system with the memory contents of an auxiliary system by means of the processor of the processing system. CONSTITUTION:Memory update mechanism 3 and 7 are provided with a function, which replaces the memory write order of a processing system 10 with the memory write order of an auxiliary system 11, a function, which does not transmit the memory access order of the processing system 10 to the auxiliary system 11 (a present-system memory access), and function, which attains the memory access of the auxiliary system from the processing system 10 (an another-system memory access). For the write order to a memory 2, the same contents are written through the memory update mechanism 3 and 7 to an auxiliary memory 6, and a processing system processor 1 compares the contents of the processing system memory 2 with the contents of the auxiliary system memory 6. A program to execute comparison is allocated to a low-order task, and the running of the task necessary for service is not prevented. Thus the processing ability of the device can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a duplex information processing apparatus, and particularly to a check method for a duplex information processing apparatus that requires high reliability.

[Prior Art] In this type of redundant information processing equipment, when switching systems when a failure occurs in the processing system or periodically switching systems for preventive maintenance, system switching is performed instantaneously at the equipment level, and at the same time, In order to maintain continuity of processing, it is necessary to always match the memory contents of the processing system and the backup system.

Conventionally, in this type of redundant information processing equipment, the same program is run synchronized at the clock level in the processing system and the standby system, and the processing results of both systems are compared to guarantee the processing contents and to The contents of system memory were guaranteed to match.

[Problems to be Solved by the Invention] The conventional redundant information processing device described above has two methods:
The synchronization mechanism obstructs improvements in device performance, resulting in a drop in the performance of the processor and memory, making it difficult to measure improvements in the device's processing power.

[Means for Solving the Problems] The present invention has been made to solve the problems listed below.
As a means of solving this problem, the present invention provides a duplex information processing device consisting of a processing system and a standby system, each of which has a processor and a memory. It has a memory update mechanism that writes the same contents to the memory of the processing system, and in order to guarantee the sameness of the memory contents of both the processing system and the backup system, the processor of the processing system compares the memory contents of the processing system and the memory contents of the backup system. It is configured to do this.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
a) (b) (C) is an explanatory diagram of the operation in Fig. 1; (a)
(b) shows the memory access of the own system, and (c) shows the memory access of the other system.

2 and 5 are processors, 2 and 6 are memories, 3.7 are memory update mechanisms, and 4 and 8 are input/output mechanisms. 1,2
, 3.4 as a processing system 10.5 degrees, and 6.7.8 as a backup system 11.

The operation will be explained below.

Processor 1 of processing system 10. Memory 2 and input/output mechanism 4
Information processing is performed using

The memory update mechanisms 3 and 7 have the following functions.

(1) Processing system memory write order) - Function to convert the processing system memory write order into a spare system memory write order (FIG. 2(a) both system memory write order l-).

(2) A function that does not transmit the processing system's memory access order to the backup system (FIG. 2(b) Self-system memory access).

(3) A function that enables the processing system to access the memory of the standby system (FIG. 2 (C) memory access of other systems).

Here, in order to realize the mechanism shown in Fig. 2, the second
A signal line for recognizing the signals shown in FIGS. (a), (b), and (c) is prepared. Typically, the signal is one that divides the address space.

The processing system processor 1 and memory 2 execute programs to perform processing on the input/output mechanisms 4 and 8. At the same time, the same contents of the write order to the memory 2 are written to the spare memory 6 via the memory update mechanisms 3 and 7. In this way, the memory contents of both systems become the same.

In order to guarantee the identity of the memory contents of both systems 10 and 11, the processing system processor 1 uses the function shown in FIG. Compare.

Naturally, the program that performs the comparison is opened to the lowest task so as not to interfere with the execution of the tasks necessary for the service.

[Effects of the Invention] As explained above, the check system of the duplex information processing apparatus of the present invention consists of a processing system and a standby system, and each of the processing system and standby system has a processor and a memory. The device has a memory update mechanism that simultaneously writes the same content to the memory of the standby system when writing to the memory of the processing system, and in order to guarantee the identity of the memory contents of both the processing and standby systems, the processing system Since the processor is configured to compare the memory contents of the processing system and the memory contents of the standby system, the following effects are produced.

(1) When a queue for memory copying is provided in the memory update mechanism, each prefecture of the duplex information processing device can perform operations independently, allowing high-speed operation. That is, compared to the prior art, there is no need to synchronize the clock levels of both systems.

(2) Checking the content identity of both memory systems can be executed by running a program without installing special hardware.

(3) Potential memory failures can be detected by sequentially reading the memories of both systems. If the memory has an error correction function, it is possible to prevent the memory from becoming incapable of error correction due to accumulation of soft errors.

[Brief Description of the Drawings] Figure 1 is a block diagram showing one embodiment of the present invention, and Figure 2 (
a), (b), and (c) are explanatory diagrams of the operation in Figure 1, where (a) is when writing to memory in both systems, (b) is when accessing memory in own system, and (
C) shows the time of accessing the memory of another system. l, 5: Brosseza 2.6: Memory 3.7: Memory update mechanism 4.8: Input/output mechanism

Claims (1)

[Claims] In a duplex information processing device consisting of a processing system and a backup system, each of which has a processor and a memory, a memory update in which the same content is written to the memory of the backup system at the same time as the processing system writes to the memory. A redundant information processing device characterized in that the processor of the processing system compares the memory contents of the processing system and the memory contents of the backup system in order to guarantee the sameness of the memory contents of both the processing system and the backup system. check method.