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 <[email protected]> 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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