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Subject: Re: [OMPI users] orte_grpcomm_modex failed
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-10-21 07:14:35

This usually means that you have a Open MPI version mismatch between some of your nodes. Meaning: on some nodes, you're finding version X.Y.Z of Open MPI by default, but on other nodes, you're finding version A.B.C.

On Oct 21, 2011, at 7:00 AM, devendra rai wrote:

> Hello Community,
> I have been struggling with this error for quite some time:
> It looks like MPI_INIT failed for some reason; your parallel process is
> likely to abort. There are many reasons that a parallel process can
> fail during MPI_INIT; some of which are due to configuration or environment
> problems. This failure appears to be an internal failure; here's some
> additional information (which may only be relevant to an Open MPI
> developer):
> orte_grpcomm_modex failed
> --> Returned "Data unpack would read past end of buffer" (-26) instead of "Success" (0)
> --------------------------------------------------------------------------
> --------------------------------------------------------------------------
> mpirun has exited due to process rank 1 with PID 18945 on
> node exiting without calling "finalize". This may
> have caused other processes in the application to be
> terminated by signals sent by mpirun (as reported here).
> I am running this on a cluster and this has started happening only after a recent rebuild of openmpi-1.4.3. Interestingly, I have the same version of openmpi on my PC, and the same application works fine.
> I have looked into this error on the web, but there is very little discussion, on the causes, or how to correct it. I asked the admin to attempt a re-install of openmpi, but I am not sure whether this will solve the problem.
> Can some one please help?
> Thanks a lot.
> Best,
> Devendra Rai
> _______________________________________________
> users mailing list
> users_at_[hidden]

Jeff Squyres
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