[Mpi-forum] MPI_Comm_split_type question

[Jeff Hammond]

The number of output communicators from MPI_Comm_split(_type) is always
one.  Different ranks may get different outputs, but one cannot transfer a
communicator object from one rank to another.

If you want to do how many total output communicators there are, you can
perform an MPI_Allgather on the color arguments and see how many unique
values there are.

Best,

Jeff

On Thu, Dec 15, 2016 at 9:32 AM, Guillaume Mercier <
guillaume.mercier at u-bordeaux.fr> wrote:

>
>
> Hello,
>
> When using the MPI_Comm_split_type function, the number of new
> communicators created is unknown.  However this information
> could be useful to distribute data across various "domains"
> (where each domain would be represented by such a communicator).
> Is there a simple (or even a not-so-simple) way to get this
> information?
>
> Thanks.
> Guillaume Mercier
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-- 
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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