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Parallel Performance of Algebraic Multigrid Domain Decomposition (AMG-DD)
arXiv - CS - Mathematical Software Pub Date : 2019-06-25 , DOI: arxiv-1906.10575
Wayne B. Mitchell; Robert Strzodka; Robert D. Falgout

Algebraic multigrid (AMG) is a widely used scalable solver and preconditioner for large-scale linear systems resulting from the discretization of a wide class of elliptic PDEs. While AMG has optimal computational complexity, the cost of communication has become a significant bottleneck that limits its scalability as processor counts continue to grow on modern machines. This paper examines the design, implementation, and parallel performance of a novel algorithm, Algebraic Multigrid Domain Decomposition (AMG-DD), designed specifically to limit communication. The goal of AMG-DD is to provide a low-communication alternative to standard AMG V-cycles by trading some additional computational overhead for a significant reduction in communication cost. Numerical results show that AMG-DD achieves superior accuracy per communication cost compared to AMG, and speedup over AMG is demonstrated on a large GPU cluster.
更新日期:2020-01-22

 

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