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Michael Clark
Harvard University

Blasting through lattice QCD computations using GPUs

Over the past five years, graphics processing units (GPUs) have become a popular platform for scientific computation.  Lattice Quantum Chromodynamics (QCD) is a non-perturbative formulation of QCD that is a grand challenge problem requiring peta- or exa-scale computation for a full solution.  I describe the challenges of using GPUs for lattice QCD calculations, and the algorithms and methods employed by the QUDA library to overcome these.  Of particular importance is the reduction of memory traffic, even at the expense of increased computation.  With the appropriate reformulation, inexpensiveclusters of GPUs can replace traditional massively parallel supercomputers.

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