[mpich-discuss] Issue with MPI_Comm_spawn_multiple

[Antonio J. Peña]

Hi folks!

I've been facing an issue with MPI_Comm_spawn_multiple when all the
following conditions are met:

   1. 'count' is > 1
   2. Any value of 'array_of_maxprocs' is > 1
   3. Setting the "hosts" info key

What I'm finding is that the spawned processes hang at MPI_Init. Find
attached a test case. You can reproduce my issue with -np 1.

Is there anything I'm doing wrong? I'm using MPICH master at 1e6c4d8. I
haven't found a pending ticket, xfail test, or test case covering this
situation.

All the best,
    Toni

[P.S.: It still feels weird to be on the other side of discuss at mpich.org]

-- 
Antonio J. Peña
Senior Researcher
Barcelona Supercomputing Center



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