Hello. In if (rank == 0) - - MPI_Send(x); - - - else - - - MPI_Recv(y) - - - Does the code that comes after MPI_Recv() start as soon as MPI_Recv() finishes its execution? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mpich.org/pipermail/discuss/attachments/20131128/350cbb0e/attachment.html>