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On Evaluating the Performability of Degradable Computing Systems

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1 Author(s)
Meyer, J.F. ; Department of Electrical and Computer Engineering and the Department of Computer and Communication Sciences, University of Michigan

If the performance of a computing system is "degradable," performance and reliability issues must be dealt with simultaneously in the process of evaluating system effectiveness. For this purpose, a unified measure, called "performability," is introduced and the foundations of performability modeling and evaluation are established. A critical step in the modeling process is the introduction of a "capability function" which relates low-level system behavior to user-oriented performance levels. A hierarchical modeling scheme is used to formulate the capability function and capability is used, in turn, to evaluate performability. These techniques are then illustrated for a specific application: the performability evaluation of an aircraft computer in the environment of an air transport mission.

Published in:

Computers, IEEE Transactions on  (Volume:C-29 ,  Issue: 8 )

Date of Publication:

Aug. 1980

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