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Power is an often-cited reason for moving to advanced architectures on thepath to Exascale computing. This is due to the practical concern of deliveringenough power to successfully site and operate these machines, as well asconcerns over energy usage while running large simulations. Since accuratepower measurements can be difficult to obtain, processor thermal design power(TDP) is a possible surrogate due to its simplicity and availability. However,TDP is not indicative of typical power usage while running simulations. Usingcommodity and advance technology systems at Lawrence Livermore NationalLaboratory (LLNL) and Sandia National Laboratory, we performed a series ofexperiments to measure power and energy usage in running simulation codes.These experiments indicate that large scale LLNL simulation codes aresignificantly more efficient than a simple processor TDP model might suggest.

Understanding Power and Energy Utilization in Large Scale Production Physics Simulation Codes