Improving many flavor QCD simulations using multiple GPUs

Details Improving many flavor QCD simulations using multiple GPUs Improving many flavor QCD simulations using multiple GPUs

2010-09-27

arxiv.org/abs/1009.5169v1

PoS Lattice2010:325,2010

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages LaTeX, 5 postscript figures. Poster presented at Lattice 2010, Villasimius, Sardinia, Italy

Scientific paper

We accelerate many-flavor lattice QCD simulations using multiple GPUs. Multiple pseudo-fermion fields are introduced additively and independently for each flavor in the many-flavor HMC algorithm. Using the independence of each pseudo-fermion field and the blocking technique for the quark solver, we can assign the solver task to each GPU card. In this report we present the blocking technique for the many-flavor dynamical QCD simulations. We investigate the effect of the blocking and the acceleration with the multiple GPUs for the Schr\"{o}dinger functional simulations with Wilson SU(3) plaquette gauge action and $N_f=10$ Wilson fermions. Five pseudo-fermion fields are introduced and the quark solver task is distributed in the ratio of 2:3 to two GPUs. We expect a 40% timing reduction from the single GPU case and have observed a 34% timing reduction in the test simulations.

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