An analytic model of the VM/370 system

  • Authors:
  • Y. Bard

  • Affiliations:
  • IBM Cambridge Scientific Center, Cambridge, MA

  • Venue:
  • IBM Journal of Research and Development
  • Year:
  • 1978

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Abstract

This paper describes an analytic model of an interactive multiprogrammed computer system. The model accepts a multiple-user-class, transaction-oriented workload description and a system configuration description, and it produces predictions of resource utilizations, transaction rates, and average transaction response times. The solution method involves nearly complete decomposition, with a closed queuing network representing the multiprogrammed set. Asymptotic formulas are used to generate good initial guesses for an overall iterative scheme. Extensive validation results are presented.