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Motivating uses include both small-scale research and development on simulated individual nodes of proposed high-performance computing systems, and large scaling studies that emulate a sizeable fraction of a future supercomputing system. The proposed architecture combines system virtualization, architectural simulation, time dilation, and slack simulation to provide scalable emulation of hypothetical systems. Virtualization-based full-system measurement and monitoring tools are also included to aid in using the proposed system for co-design of high-performance computing system software and architectural features for future systems. 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