Re: [OMPI users] Does MPI_Bsend always use the buffer?

[George Bosilca]

On Dec 11, 2007, at 10:33 AM, Gleb Natapov wrote:

On Tue, Dec 11, 2007 at 10:27:32AM -0500, Bradley, Peter C. (MIS/ CFD) wrote:

In OpenMPI, does MPI_Bsend always copy the message to the user- specified buffer, or will it avoid the copy in situations where it knows the send can

complete?

If the message size if smaller than eager limit Open MPI will not use
user-specified buffer for it.

  george.

This is an implementation details. You should avoid relying on such things in a portable MPI applications. The safe assumption here is that MPI_Bsend always copy the buffer, as described in the MPI standard.

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