Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

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