Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 231, Issue 4, Pages 1866-1878Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2011.11.003
Keywords
GPU; BiCGstab-M; BiCGstab
Funding
- DOE [DE-FG02-95ER-40907]
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Graphical Processing Units (GPUs) are more and more frequently used for lattice QCD calculations. Lattice studies often require computing the quark propagators for several masses. These systems can be solved using multi-shift solvers but these algorithms are memory intensive which limits the size of the problem that can be solved using GPUs. In this paper, we show how to efficiently use a memory-lean single-mass solver to solve multi-mass problems. We focus on the BiCGstab algorithm for Wilson fermions and show that the single-mass solver not only requires less memory but also outperforms the multishift variant by a factor of two. (C) 2011 Elsevier Inc. All rights reserved.
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