Simulation of the load of an interactive system
1976
We describe a simulator of interactive users designed for the resource sharing system ESOPE. We stress the guide-lines of the design as well as the problems of interface with the operating system, of measurements, and of perturbations caused by the simulator in the statistics gathered.We show two examples of an application of the simulator to the design of a resource-sharing system, viz., to an anlysis of load regulation policies, and to an evaluation of the improvement in system performance one may expect from implementing shared translators.Finally, we use the load simulator to validate a mathematical model. The latter is developped by step-wise refinement, using measured values of model parameters, till a good agreement between the performance indices computed from our model and those measured in a real system under simulated load, is obtained. It is observed that, for most of the performance measures considered, a simple model matches fairly well the "real world".
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