JPH09179835A - Parallel processor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to install a dedicated trace circuit so as to specify a fault position on a common bus. SOLUTION: A search program for fault position specification is downloaded from a main processor 2 to subprocessors 3-5. On the sides of the subprocessors 3-5, the two subprocessors 3 and 4 are selected out of all the subprocessors 3-5 in order with a simultaneous interruption start signal sent from the main processor 2 according to the search program, and block data with a SUM code is transferred mutually between both the subprocessors 3 and 4; and a SUM check is made as to the received data and the fault position on the common bus 1 is specified according to the check result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel processor system used in a field in which high-speed real-time calculation such as power control and measurement is required, and a check before starting and a failure portion identification in case of failure are required. Regarding

[0002]

2. Description of the Related Art In a conventional parallel processor system, a plurality of processors have an access right (a position to drive as a master) and use a shared bus, so that the control of the bus is bidirectional, which is more complicated than a single processor system. It has become a structure. Therefore, failures that occur around the shared bus include those that permanently stop the system and temporary data corruption due to intermittent failures. But,
In the former case, there are many cases in which the device recovers by resetting and shifts to an intermittent failure, and in the end it is generally an intermittent failure. Therefore, in order to detect these failures, parity check of shared bus data and access time monitoring are performed. Furthermore, a dedicated trace function circuit for recording the failure status of the shared bus is provided to identify the failure (point) part.

[0003]

However, when a dedicated trace circuit is provided for identifying a faulty part, there is a problem in that the cost increases correspondingly.

[0004]

In order to solve the above problems, the invention according to claim 1 is a parallel processor system in which a plurality of processors each having an access right are connected by a shared bus. A search program for identifying a faulty part of the bus is downloaded from the main processor to the sub processor. Based on the downloaded search program, the sub-processors sequentially select 2 from all the sub-processors according to the timing of the simultaneous interrupt activation signal sent from the main processor to the sub-processors.
One sub-processor is selected, the SUM coded block data is transferred between the two sub-processors, and the SUM coded block data received by the sub-processor is SUM-checked. Next, the SUM check result of each sub-processor is collected in the main processor to identify the faulty part. Thereby, the failure part is specified without using the bus monitoring trace circuit.

According to a second aspect of the invention, in the first aspect of the invention, two sub-processors are sequentially selected from all the sub-processors based on the number of simultaneous interrupt activation signals sent from the main processor to the sub-processors.

According to a third aspect of the present invention, in the first or second aspect of the invention, the two sub-processors access from each other at the timing at which the contention phase is changed each time. Thereby, the contention control operation of the sub processor is also tested.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a parallel processor system to which the present invention is applied. In the figure, reference numeral 1 denotes a shared bus, to which a main processor 2 and sub processors 3 to 5 are connected. The main block sensor 2 has a bus access timeout (release) detection function. In addition, the main processor 2 and each sub processor 3 to
5 are connected by a simultaneous interrupt activation line 6. In addition,
7 to 10 in the figure are bus buffers.

FIG. 2 is an explanatory diagram of processing executed in the system of FIG. The process for identifying the faulty part will be described below with reference to FIG. (1) First, from the main processor 2 to the sub processors 3 and 4
Download the failure reproduction check program (fault search program) to etc. (2) Next, the main processor 2 to each sub processor 3,
Simultaneous interrupt activation signal is sent to 4 etc. (Fig. A). (3) On the side of the sub-processor that has received the simultaneous interrupt activation, two sub-processors are designated according to the number of interrupts. The block data (write) with the SUM code is transferred to the designated one of the sub-processors 3 as the master and the other of the designated sub-processors 4 as the slaves (FIG. B).

(4) Next, the block data written in the sub processor 4 is read back to the sub processor 3 again (FIG. 7C). (5) Here, the sub processors 3 and 4 perform the SUM check of the block data transferred to each other (FIG. D). (6) The obtained SUM check result is the main processor 2
Is sent from the sub-processors 3 and 4 to the main processor 2 by the check access from and the abnormality of the SUM data or the abnormal stop of the shared bus is detected (Fig. E). When an abnormality is detected, the occurrence site is specified.

It should be noted that the main processor 2 can identify the sub processor in which the abnormality has been detected, from the number of times the simultaneous interrupt activation signal is transmitted. Next, if no abnormality is detected, the write and readback of the block data with SUM code is similarly continued between the sub processors newly designated by the simultaneous interrupt start signal sent from the main processor 2. To be done. As a result, bidirectional access is checked for all cases of combinations in which two are extracted from all sub-processors.

FIG. 3 is an explanatory diagram of another processing executed in the system of FIG. Below, based on FIG.
The process for identifying the faulty part will be described. (1) First, from the main processor 2 to the sub processors 3 and 4
Download the failure reproduction check program (fault search program) to etc. (2) Next, the main processor 2 to each sub processor 3,
Simultaneous interrupt activation signal is sent to 4 etc. (Fig. A).

(3) On the side of the sub-processor which has received the simultaneous interrupt activation, two sub-processors are designated according to the number of interrupts. The designated sub-processors 3 and 4 alternately transfer the block data with SUM code (write) as a master access (FIG. B). Further, here, by operating the number of steps of the program in advance, the contention phases are changed each time to access each other and check the contention control function of the contention control circuits of the sub-processors 3 and 4.

(4) Next, the sub processors 3 and 4 perform the SUM check of the block data transferred to each other (FIG. C). (5) The obtained SUM check result is the main processor 2
Is sent from the sub-processors 3 and 4 to the main processor 2 by the check access from and the abnormality of the SUM data or the abnormal stop of the shared bus is detected (Fig. D). When an abnormality is detected, the occurrence site is specified.

It should be noted that the main processor 2 can identify the sub processor in which the abnormality has been detected, from the number of times the simultaneous interrupt activation signal is sent. If no abnormality is detected, the SUs are similarly set between the sub processors newly designated by the simultaneous interrupt activation signal sent from the main processor 2.
Writes from both M-coded block data continue. Thereby, the functions of the bidirectional access and the contention control operation are checked in all cases of the combination in which two are extracted from all the sub-processors.

As described above, in the parallel processor system according to the present invention, it becomes possible to identify the faulty part by software without installing a trace circuit for dedicated bus monitoring. Can also reduce costs. Further, in the present invention, by checking bidirectional access between the sub-processors, it becomes possible to make a retrospective determination up to the condition of occurrence of a failure that could not be known by conventional bus monitoring alone, and the mechanism of failure occurrence is detailed. It becomes possible to clarify.

[0016]

As described above, according to the present invention, based on the search program downloaded from the main processor to the sub processor, the block data with the SUM code is transferred between the sub processors and the SUM check result is transferred to the main processor. By collecting, the failure part of the common bus connecting the sub processors is specified. This eliminates the need for a dedicated trace circuit for identifying the faulty part, thus reducing the system cost. In addition, by accessing from the two sub-processors at the timing at which the contention phase is changed each time, the contention control operation of each sub-processor can be tested.

[Brief description of the drawings]

FIG. 1 is a block diagram of a parallel processor system to which the present invention is applied.

FIG. 2 is an explanatory diagram of processing executed in the system of FIG.

3 is an explanatory diagram of another processing executed in the system of FIG.

[Explanation of symbols]

 1 shared bus 2 main processor 3 to 5 sub processor 6 simultaneous interrupt activation line 7 to 10 bus buffer

Claims (3)

[Claims] 1. In a parallel processor system configured by connecting a plurality of processors each having an access right by a shared bus, a search program for specifying a failure part of the shared bus is downloaded from a main processor to a sub processor. Based on the means and the search program, the timing of the simultaneous interrupt activation signal sent from the main processor to the sub processor
Based on the means for selecting two sub-processors from all sub-processors in sequence and mutually transferring the block data with SUM code between the sub-processors, and the S received by the sub-processors based on the search program.
A parallel processor system comprising: means for performing a SUM check of block data with a UM code; and means for collecting a SUM check result of each sub-processor in a main processor to identify a failure part. 2. The parallel processor system according to claim 1, wherein two sub-processors are sequentially selected from all the sub-processors based on the number of simultaneous interrupt activation signals sent from the main processor to the sub-processors. Parallel processor system. 3. The parallel processor system according to claim 1 or 2, wherein the two sub-processors access each other at a timing at which the contention phase is changed each time.