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Subject: Re: [OMPI devel] trunk hangs since r19010
From: Terry Dontje (Terry.Dontje_at_[hidden])
Date: 2008-07-28 13:08:51


Jeff Squyres wrote:
> On Jul 28, 2008, at 12:03 PM, George Bosilca wrote:
>
>> Interesting. The self is only used for local communications. I don't
>> expect that any benchmark execute such communications, but apparently
>> I was wrong. Please let me know the failing test, I will take a look
>> this evening.
>
> FWIW, my manual tests of a simplistic "ring" program work for all
> combinations (openib, openib+self, openib+self+sm). Shrug.
>
> But for OSU latency, I found that openib, openib+sm work, but
> openib+sm+self hangs (same results whether the 2 procs are on the same
> node or different nodes). There is no self communication in
> osu_latency, so something else must be going on.
>
Is it something to do with the MPI_Barrier call? osu_latency uses
MPI_Barrier and from rhc's email it sounds like his code does too.

--td