Journal of Parallel and Distributed Computing
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A recent report focused on the technical challengesin advancing from today's "petascale" systems to "exascale."Power, or more accurately energy, was a dominant challenge. Thispaper briefly reviews the energy challenge for exascaled sizedsystems, with an emphasis on the relatively enormous energy costsof referencing operands from the memory hierarchy. Then, usinga key step from the LINPACK benchmark, we investigate twodifferent approaches to reducing such costs: one which migratescomputations up from the host to higher levels of the hierarchy,and another in moving the whole computation closer to memory.Both show significant improvements over architecture as usual.