Open, Closed, and Mixed Networks of Queues with Different Classes of Customers
Journal of the ACM (JACM)
Computational algorithms for closed queueing networks with exponential servers
Communications of the ACM
Validation of a queueing model with classes of customers
SIGMETRICS '76 Proceedings of the 1976 ACM SIGMETRICS conference on Computer performance modeling measurement and evaluation
Network models for large-scale time-sharing systems
Network models for large-scale time-sharing systems
Measurement and analysis for computer performance evaluation.
Measurement and analysis for computer performance evaluation.
A structural approach to computer performance analysis
AFIPS '73 Proceedings of the June 4-8, 1973, national computer conference and exposition
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One possible use of an analytical model of a computer system is to predict the increase in performance that results from a proposed modification of the existing system. With this aspect in mind, experiments were conducted that hypothesized situations in which a manager was considering upgrading his system and was interested in estimating the performance improvements to weigh against the anticipated costs. The basic concept was to run a benchmark program on the baseline system and to validate the model parameters. After validation, the model was used to predict CPU and I/O channel utilizations for the upgraded or reconfigured system. Lastly, the benchmark was rerun on the reconfigured system and measured utilizations were compared with predicted values from the model. There was good agreement between predicted and measured utilizations when adding a channel to an IBM 370/155, when reallocating files and adding two channels to an IBM 370/155--2, and when adding a channel to an IBM 370/168--1.