Improve MPI code Sample Clauses

Improve MPI code. MPI messages should be grouped to avoid multiple smaller messages o e.g. use derived data types to avoid double buffering • Avoid any storage or computation of O(nranks) • Avoid all-to-all communication o e.g. if(rank==0)then do work over all other ranks • Remove unnecessary MPI_BARRIERs • Do not over schedule cores when using threaded maths libraries o typically control using OMP_NUM_THREADS even when libs do not use OpenMP • Use nonblocking collective communications. o overlap computation and communications where possible • Remove unnecessary communication synchronisation o use MPI_TEST rather than MPI_WAIT o avoid MPI_Probe § it most likely forces internal buffering to report the size of the pending message o Avoid ordered halo swapping,
Sample 1
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