[mpich-discuss] Issue with MPI_Comm_spawn_multiple

[Thakur, Rajeev]

Looks like it is related to the hosts key. Works without that.

Rajeev

> On Oct 2, 2015, at 10:34 AM, Antonio J. Peña <antonio.pena at bsc.es> wrote:
> 
> 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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