An experimental study of computer system performance

  • Authors:
  • H. D. Schwetman;J. C. Brown

  • Affiliations:
  • -;-

  • Venue:
  • ACM '72 Proceedings of the ACM annual conference - Volume 2
  • Year:
  • 1972

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Abstract

This paper describes an experimental study of the performance of a large multi-programmed computer system (the UT-l/CDC 6600 system at the University of Texas at Austin) under systematic variation of available resources and resource allocation algorithms. The experiments were carried out in a controlled and reproducible environment provided by a synthetic job stream generator. The experimental data was recorded by an event-driven software monitor which recorded a complete trace of system activities at the level of system defined events. The study relates resource utilization and queueing patterns to the metric of job completion rate. The experiments undertaken in these studies are single factor experiments. Compensatory reactions by this complex system to variation of individual resources are nonetheless revealed. The experiments also demonstrate the criticality of optimal scheduling of bottleneck resources and offer comparisons of the performance of multi-drive disk units under different conditions of availability and space assignment. The data gathering facility was also run on the production environment to determine base lines for comparison to the experiments as well as for an understanding of the production mode of operation of the system.