[Mpi-forum] behavior of NBC for intracommunicators when root == MPI_PROC_NULL

Fab Tillier ftillier at microsoft.com
Thu Dec 11 13:30:27 CST 2014

Hi Folks,

I can't find anything in the standard document that explains the behavior for NBC requests on intercommunicators when root == MPI_PROC_NULL.  Taking MPI_Ibcast as an example, what is the output value of request?  Is it MPI_REQUEST_NULL?  Is it not set at all?  Is it a valid request that must be completed?

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