On Sep 13, 2011, at 8:41 AM, devendra rai wrote:
> Also, I read the definition of MPI_Ssend(...) that you sent, but then it does not explain why both MPI_Ssend(...) and MPI_Recv(...) are blocked seemingly forever.
Oh, they're blocked *forever*! Sorry; I didn't get that from your prior description -- I thought you just wanted non-blocking instead of blocking.
> I notice that such a block happens when MPI_Recv(...) is posted before MPI_Ssend(...).
It doesn't matter if the receive is posted before the send or the other way around.
When blocking sends/receives block forever, it usually means that there's a mismatch in the communicator, tag, or src/dest arguments between the two.
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