We outline a la carte, an approach for simulating computing architectures applicable to extreme-scale systems (thousands of processors) and to advanced, novel architectural configurations, and describe in detail our simulation model of the Quadrics interconnection network. Our component-based design allows for the seamless assembly of architectures from representations of workload, processor, network interface, switches, etc., with disparate resolutions and fidelities, into an integrated simulation model. This accommodates different case studies that may require different levels of fidelity in various parts of a system. Simple ping timings can be modeled to approximately 100 ns. We present results comparing the simulated versus actual execution time of a 3D neutron transport application run on a machine with a Quadrics network.
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