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Cross-Diagnostic Method in Multi-Processing System

IP.com Disclosure Number: IPCOM000100900D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Kumaki, A: AUTHOR [+4]

Abstract

Described is a new diagnostic method, called a cross-diagnostic (X- diagnostic), for enhancing a diagnostic capability in a loosely coupled multi-processing (LCMP) system. In a LCMP, one processor element (PE) is provided as a diagnostic processor (DP) to maintain it. However, the DP is not able to diagnose the system completely, because the diagnosis between any PEs can not be performed by one DP and the system has to be diagnosed by all of the PEs. In the LCMP with the X-diagnostic method, one PE has a function as a diagnostic manager (DM) and all of the PEs are designed to be able to perform as a DP if required by the DM. In order to diagnose one PE, the DM has a capability to request all PEs to diagnose it. It is possible to make a synthetic diagnosis from the result of their diagnoses.

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Cross-Diagnostic Method in Multi-Processing System

       Described is a new diagnostic method, called a
cross-diagnostic (X- diagnostic), for enhancing a diagnostic
capability in a loosely coupled multi-processing (LCMP) system.  In a
LCMP, one processor element (PE) is provided as a diagnostic
processor (DP) to maintain it.  However, the DP is not able to
diagnose the system completely, because the diagnosis between any PEs
can not be performed by one DP and the system has to be diagnosed by
all of the PEs.  In the LCMP with the X-diagnostic method, one PE has
a function as a diagnostic manager (DM) and all of the PEs are
designed to be able to perform as a DP if required by the DM.  In
order to diagnose one PE, the DM has a capability to request all PEs
to diagnose it.  It is possible to make a synthetic diagnosis from
the result of their diagnoses.

      Shown above is a functional block diagram showing the LCMP, in
which PEs communicate with one another through a switch.

      In the LCMP in the figure, PE-1 has the function of the DP and
normally diagnoses other PEs by sending diagnostic commands to them.
Furthermore, PE-1 can transfer the function of the DP to another PE
and supervise it as the DM.

      When an error occurs on a communication between PE-2 and PE-4,
PE-1 may not be able to detect the error even if PE-1 diagnoses both
of them, because PE-1 can't diagnose all the area of the
communication path between PE-2 and PE-4. In this cas...