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The Computer Journal 1986 29(5):396-403; doi:10.1093/comjnl/29.5.396
© 1986 by British Computer Society
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Data Recording and Monitoring for Analysis of System Response Times

J. P. Penny1 *, P. J. Ashton1 * and A. L. Wilkinson2 §

1 Department of Computer Science, University of Canterbury, Christchurch, New Zealand, 2 Computer Centre, University of Canterbury, Christchurch, New Zealand

A formal basis is proposed for determining what data should be recorded for monitoring to evaluate response-time performance of a time-sharing system. The proposal is made because of perceived limitations of traditional performance monitors. The essential idea is that one views requests from each user as being handled by a single, abstract, interactive process, which can be in any of a possibly large number of disjoint states. These states are defined by whether or not each interactive process is running on, or is queued for, any of a specified set of system resources. The value of the proposal is illustrated by describing the advantages and limitations of a software monitor developed to measure components of response time for interactive work on Prime Series 50 machines. After a discussion of the possibility of other implementations of the formal model, the essential requirements for such implementations are summarised.

Received January 1984.

* Department of Computer Science, University of Canterbury, Christchurch, New Zealand

§ Computer Centre, University of Canterbury, Christchurch, New Zealand


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