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Analysis of the PASM control system memory hierarchy

Many proposed large-scale parallel processing systems (e.g., PASM) can operate in multiple-SIMD mode. The multiple control units in such a system share a common secondary storage for programs. The control units use paging to transfer programs to their primary memories. One design problem is determining the optimal service rate for the secondary storage, where the "optimal" is characterized by maximum processor utilization. The problem is approached by developing a queueing network model for the PASM control system memory hierarchy. Based on assumed values for parameters which characterize the expected task environment, an optimal service rate is derived from the model. The values of the parameters in the model can be varied to determine the impact these changes would have on system performance. Simulation results verifying various aspects of the model are presented. The results are shown to apply to the general model for a multipleSIMD machine.