We report an implementation of a multigrid solver for the Clover fermion on supercomputer Fugaku, which uses A64FX CPU with Arm architecture. On Fugaku, a highly optimized implementation of BiCGStab solver with domain decomposed preconditioner for the Clover fermion, called QCD Wide SIMD library (QWS), is available. We use the preconditioner in QWS as a smoother of the multigrid solver. Our implementation shows reasonably good scaling and performance. The code is developed by using Bridge++ code framework and its extension.
Cite
@article{arxiv.2112.00501,
title = {Multigrid Solver on Fugaku},
author = {Ken-Ichi Ishikawa and Issaku Kanamori and Hideo Matsufuru},
journal= {arXiv preprint arXiv:2112.00501},
year = {2021}
}
Comments
8 pages, 3 figures, talk presented at the 38th International Symposium on Lattice Field Theory (Lattice 2021), 26-30 July, 2021, Zoom/Gather@Massachusetts Institute of Technology