OpenMP/MPI Hybrid Parallel Multigrid Method on Fujitsu FX10 Supercomputer System

The Multigrid method used with OpenMP/MPI hybrid parallel programming models is expected to play an important role in large-scale scientific computing on post-peta/exa scale supercomputer systems. In the present work, gcoarse grid aggregationh is proposed for robust convergence of multigrid solvers with large numbers of MPI processes. The robustness and performance of the proposed method has been evaluated using up to 4,096 nodes (65,536 cores) of the Fujistu FX10 supercomputer system. The results of the proposed method have proved to be excellent, especially for strong scaling computation.