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. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss