[mpich-discuss] MPI_Rsend advantage

Dorier, Matthieu mdorier at anl.gov
Wed Sep 6 05:21:32 CDT 2017


Out of curiosity, what gain is there to using MPI_Rsend instead of MPI_Send when I know that the receiver has posted a receive? Do I avoid a rendez-vous protocol? Do I avoid a buffer copy somewhere?


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