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Subject: Re: [OMPI users] openmpi credits for eager messages
From: Gleb Natapov (glebn_at_[hidden])
Date: 2008-02-05 02:28:27

On Mon, Feb 04, 2008 at 04:23:13PM -0500, Sacerdoti, Federico wrote:
> Bug3 is a test-case derived from a real, scalable application (desmond
> for molecular dynamics) that several experienced MPI developers have
> worked on. Note the MPI_Send calls of processes N>0 are *blocking*; the
> openmpi silently sends them in the background and overwhelms process 0
> due to lack of flow control.
MPI_Send is *blocking* in MPI sense of the word i.e when MPI_Send returns
send buffer can be reused. MPI spec section 3.4.