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Subject: Re: [OMPI users] alltoall messages > 2^26
From: Terry Dontje (terry.dontje_at_[hidden])
Date: 2011-04-05 11:24:20


It was asked during the community concall whether the below may be
related to ticket #2722 https://svn.open-mpi.org/trac/ompi/ticket/2722?

--td

On 04/04/2011 10:17 PM, David Zhang wrote:
> Any error messages? Maybe the nodes ran out of memory? I know MPI
> implement some kind of buffering under the hood, so even though you're
> sending array's over 2^26 in size, it may require more than that for
> MPI to actually send it.
>
> On Mon, Apr 4, 2011 at 2:16 PM, Michael Di Domenico
> <mdidomenico4_at_[hidden] <mailto:mdidomenico4_at_[hidden]>> wrote:
>
> Has anyone seen an issue where OpenMPI/Infiniband hangs when sending
> messages over 2^26 in size?
>
> For a reason i have not determined just yet machines on my cluster
> (OpenMPI v1.5 and Qlogic Stack/QDR IB Adapters) is failing to send
> array's over 2^26 in size via the AllToAll collective. (user code)
>
> Further testing seems to indicate that an MPI message over 2^26 fails
> (tested with IMB-MPI)
>
> Running the same test on a different older IB connected cluster seems
> to work, which would seem to indicate a problem with the infiniband
> drivers of some sort rather then openmpi (but i'm not sure).
>
> Any thoughts, directions, or tests?
> _______________________________________________
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> users_at_[hidden] <mailto:users_at_[hidden]>
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>
>
>
>
> --
> David Zhang
> University of California, San Diego
>
>
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-- 
Oracle
Terry D. Dontje | Principal Software Engineer
Developer Tools Engineering | +1.781.442.2631
Oracle *- Performance Technologies*
95 Network Drive, Burlington, MA 01803
Email terry.dontje_at_[hidden] <mailto:terry.dontje_at_[hidden]>



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