I recommend that you read "Semantics of Point-to-Point Communication" in the MPI standard (section 3.5 in MPI 3.1). It has all of the information that you seek. Best, Jeff On Tue, Oct 20, 2015 at 7:58 AM, Dorier, Matthieu <[email protected]> wrote:

Hi,

In my program I have a loop of this form:

loop { MPI_Send(small message) MPI_Isend(big message) } do_some_computation() MPI_Waitall

The sends and isends all have the same target rank.

Is there a risk that an MPI_Send forces a previously posted MPI_Isend to

complete before it can complete itself (in which case I would loose the benefit of using non-blocking sends)?

Thanks,

Matthieu

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