Question: Noting that the MPI_Send() could be blocking or non-blocking but MPI_Recv() primitive is always blocking. Give one scenario where the uncertainty of the arrival/receipt of

Noting that the MPI_Send() could be blocking or non-blocking but MPI_Recv() primitive is always blocking.

Give one scenario where the uncertainty of the arrival/receipt of messages, order of delivery of messages, message buffering, etc.all make MPI programming also difficult.

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