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The deterministic nature of conservative simulation makes it possible to conduct an accurate trace-driven analysis of an existing sequential simulator in order to predict concurrency profiles and speedup bounds for several parallel implementations. This paper describes such an analysis carried out on a commercial VLSI digital circuit simulator with results based on real instance evaluation times at microsecond resolutions. We consider a central event queue based model with and without lookahead, as well as the distributed message passing model. The results help to answer the important questions, ‘Just how much concurrency is there in real commercial VLSI simulations?” and “What type of machine would be best suited for a parallel implementation?”

Potential performance of parallel conservative simulation of VLSI circuits and systems