Autor:	Nakamura, Y., Ishikawa, K. -I., Kuramashi, Y., Sakurai, T., Tadano, H.
Rok vydání:	2011
Předmět:	High Energy Physics - Lattice
Druh dokumentu:	Working Paper
DOI:	10.1016/j.cpc.2011.08.010
Popis:	We present results for application of block BiCGSTAB algorithm modified by the QR decomposition and the SAP preconditioner to the Wilson-Dirac equation with multiple right-hand sides in lattice QCD on a $32^3 \times 64$ lattice at almost physical quark masses. The QR decomposition improves convergence behaviors in the block BiCGSTAB algorithm suppressing deviation between true residual and recursive one. The SAP preconditioner applied to the domain-decomposed lattice helps us minimize communication overhead. We find remarkable cost reduction thanks to cache tuning and reduction of number of iterations. Comment: 5 pages, 2 figures, 1 table
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1104.0737 Zobrazit plný text záznamu View this record from Arxiv