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The Computer Journal 1988 31(3):201-208; doi:10.1093/comjnl/31.3.201
© 1988 by British Computer Society
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Analysis of Comparison-based Diagnosable Systems using Temporal Criteria

F. Lombardi *

Department of Electrical and Computer Engineering, The University of Colorado, Campus Box 425, Boulder, CO 80309, USA

This paper deals with a new approach to system-level diagnosis by comparison. This approach is based on temporal criteria for the identification of faulty units in a multiprocessor computer system for fault-tolerant processing. A hybrid fault model is presented. It relates the effects of different types of fault (permanent and transient) to the execution of jobs. Jobs are assigned on a unit-pair basis for fault-tolerant processing. An algorithm is presented to release the result outputs correctly using comparisons. This algorithm employs a scheduling technique referred to as sense of direction in the comparison assignment.

A novel source for misdiagnosis, referred to as temporal invalidation, is introduced in the comparison assignment. The algorithm for the job-release process is optimal with respect to the number of comparisons.

The analysis is extended to prove that a comparison-based system can yield a higher throughput than a voting arrangement with the same number of units.

Received April 1986. Revised January 1987.

* Supported by a grant from AT&T and by an Engineering Foundation Research Initiation Grant.

§ Department of Electrical and Computer Engineering, The University of Colorado, Campus Box 425, Boulder, CO 80309, U.S.A.


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