[mpich-discuss] Using MPIX_Comm_shrink on intercommunicator

[Bland, Wesley B.]

Hi Maciej,

Unfortunately, the ULFM features have not yet been implemented for intercommunicators so what you’re seeing is not unexpected.

Thanks,
Wesley



On 3/18/15, 8:40 AM, "Maciej Szpindler" <m.szpindler at icm.edu.pl> wrote:

>Dear All,
>
>I am trying to use ULFM functions implemented in MPICH. I am aware that
>these extensions are still just (?) experimental and not a part of the 
>standard. Nevertheless I have tried to use MPIX_Comm_shrink, in a way
>described here:
>
> 
>https://svn.mpi-forum.org/trac/mpi-forum-web/raw-attachment/ticket/323/ft.pdf
>
>on the intercommunicator that contains failed processes in the remote
>group. The function fails with:
>
>Assertion failed in file src/mpi/comm/comm_create_group.c at line 47: 
>comm_ptr->comm_kind == MPID_INTRACOMM
>
>I am working with MPICH v3.2a2. May I ask for a comment on this?
>Is this the behaviour that should be expected?
>
>Best Regards,
>Maciej
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