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Subject: Re: [OMPI users] mca_pml_ob1_send blocks
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2009-08-26 10:38:43

On Aug 25, 2009, at 6:51 PM, Shaun Jackman wrote:

> The receiver posts a single MPI_Irecv in advance, and as soon as it's
> received a message it posts a new MPI_Irecv. However, there are
> multiple processes sending to the receiver, and only one MPI_Irecv
> posted.

Yes, this could cause blocking. Specifically, the receiver may not
advance any other senders until the matching Irecv is posted and is
able to make progress.

Jeff Squyres