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Subject: Re: [OMPI users] Mapping ranks to hosts (from MPI error messages)
From: Gus Correa (gus_at_[hidden])
Date: 2014-03-27 14:06:19

Hi John

Take a look at the mpiexec/mpirun options:

-report-bindings (this one should report what you want)

and maybe also also:

-bycore, -bysocket, -bind-to-core, -bind-to-socket, ...

and similar, if you want more control on where your MPI processes run.

"man mpiexec" is your friend!

I hope this helps,
Gus Correa

On 03/27/2014 01:53 PM, Sasso, John (GE Power & Water, Non-GE) wrote:
> When a piece of software built against OpenMPI fails, I will see an
> error referring to the rank of the MPI task which incurred the failure.
> For example:
> MPI_ABORT was invoked on rank 1236 in communicator MPI_COMM_WORLD
> with errorcode 1.
> Unfortunately, I do not have access to the software code, just the
> installation directory tree for OpenMPI. My question is: Is there a
> flag that can be passed to mpirun, or an environment variable set, which
> would reveal the mapping of ranks to the hosts they are on?
> I do understand that one could have multiple MPI ranks running on the
> same host, but finding a way to determine which rank ran on what host
> would go a long way in help troubleshooting problems which may be
> central to the host. Thanks!
> --john
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