GPU-Based Conjugate Gradient Solver for Lattice QCD with Domain-Wall Fermions

Details GPU-Based Conjugate Gradient Solver for Lattice QCD with Domain-Wall Fermions GPU-Based Conjugate Gradient Solver for Lattice QCD with Domain-Wall Fermions

2011-01-02

arxiv.org/abs/1101.0423v1

PoS LAT2010:030,2010

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, talk presented at The XXVIII International Symposium on Lattice Field Theory, Lattice 2010, June 14-19, 2010, Villasi

Scientific paper

We present the first GPU-based conjugate gradient (CG) solver for lattice QCD with domain-wall fermions (DWF). It is well-known that CG is the most time-consuming part in the Hybrid Monte Carlo simulation of unquenched lattice QCD, which becomes even more computational demanding for lattice QCD with exact chiral symmetry. We have designed a CG solver for the general 5-dimensional DWF operator on NVIDIA CUDA architecture with mixed-precision, using the defect correction as well as the reliable updates algorithms. We optimize our computation by even-odd preconditioning in the 4D space-time lattice, plus several innovative techniques for CUDA kernels. For NVIDIA GeForce GTX 285/480, our CG solver attains 180/233 Gflops (sustained).

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