Rick,
if you are using an inter communicator, please refer to the man page (a
group has to use MPI_ROOT as the root argument)
Cheers,
Gilles
On 10/21/2016 3:36 PM, George Bosilca wrote:
Rick,
There are few requirements to use any communicator in a collective
operation (including MPI_R
Rick,
There are few requirements to use any communicator in a collective
operation (including MPI_Reduce), and most of them are common sense. All
ranks in the communicator must call the collective, and the different ranks
should all reach the collective together (no unmatched blocking
communicatio
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Folks;
My MPI_COMM_WORLD size is 2000. I have created a communicator
based on a small subset. I have used this communicator in MPI_Barrier calls and
it seems to work fine. Now I want to use this in MPI_Reduce. When I do this I
get errors
