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IBM Journal of Research and Development  
Volume 22, Number 5, Page 498 (1978)
IBM Scientific Centers
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An Analytic Model of the VM/370 System

by Y. Bard
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.
Related Subjects: Measurement; Models and modeling; Virtual machines