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Subject: Re: [OMPI users] Mpirun only works when n< 3
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-07-11 10:21:38


Have you disabled firewalls between your compute nodes?

On Jul 11, 2011, at 9:34 AM, Randolph Pullen wrote:

> This appears to be similar to the problem described in:
>
> https://svn.open-mpi.org/trac/ompi/ticket/2043
>
> However, those fixes do not work for me.
>
> I am running on an
>
> - i5 sandy bridge under Ubuntu 10.10 8 G RAM
>
> - Kernel 2.6.32.14 with OpenVZ tweaks
>
> - OpenMPI V 1.4.1
>
> I am trying to migrate existing software to a new cluster (A,B)
>
> Symptoms:
>
> I can run the ring demo on a single machine, either A or B with any number of processes.
>
> But when I combine the 2 machines I am limited to 2 processes, any more and MPI hangs. It gets as far as:
>
> Process 0 sending 10 to 1, tag 201 (3 processes in ring)
>
> Process 0 sent to 1
>
> and there it stays...
>
> Any help greatly appreciated.
>
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-- 
Jeff Squyres
jsquyres_at_[hidden]
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