[mpich-discuss] Singleton init configuration for MPICH

[Jeff Hammond]

It's an open issue: https://trac.mpich.org/projects/mpich/ticket/1074.

There was some discussion on the devel list as of last week that might be
of interest to you.

Jeff

On Mon, Aug 1, 2016 at 8:47 AM, Edric Ellis <Edric.Ellis at mathworks.co.uk>
wrote:

> Hi,
>
>
>
> I need to come up with an MPICH build that allows singleton-init processes
> to use MPI_Comm_connect/accept to get connected. Our MPICH2 build uses the
> “smpd” process manager to achieve this. However, now that we’re upgrading
> to MPICH (3.1.4), I notice that the “smpd” process manager no longer
> exists. Is there a combination of process manager and PMI that allows
> connect/accept for singleton-init processes? I’ve tried a few things and
> cannot seem to find a combination that works. Here are the things I’ve
> tried:
>
>
>
> 1.       Hydra with pmi=simple – fails when attempting to launch hydra’s
> mpiexec (I don’t have the message to hand, but my recollection is that
> hydra’s mpiexec didn’t accept “-pmi_args”)
>
> 2.       Hydra with pmi=pmi2/simple – cannot be built
>
> 3.       Gforker with pmi=pmi2/simple – required a couple of tweaks
> before it could be built, and then fails in PMPI_Init_thread complaining
> “Message truncated”
>
>
>
> Is there some other combination that might work? Ideally, the
> singleton-init processes wouldn’t need to use mpiexec at all (as was the
> case with our MPICH2 build using smpd).
>
>
>
> Cheers,
>
> Edric.
>
>
>
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-- 
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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