3070	 Hybrid Simulation Models of Computer Systems	 This paper describes the structure and operation of a hybrid simulation model in which both discrete-event simulation and analytic techniques are combined to produce efficient yet accurate system models. In an example based on a simple hypothetical computer system discrete-event simulation is used to model the arrival and activation of jobs and a central-server queueing network models the use of system processors. The accuracy and efficiency of the hybrid technique are demonstrated by comparing the result and computational costs of the hybrid model of the example with those of an equivalent simulation-only model. Performance evaluation simulation queueing network models central server model
