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From: Michael Kluskens (mkluskens_at_[hidden])
Date: 2006-03-27 10:06:34

The constant MPI_ROOT is not universally defined in all current
shipping MPI implementations.

Is there any MPI function/call that requires MPI_ROOT?

 From the complete reference it appears that MPI_ALLGATHER might be
the one routine.

This all relates to portability, code I write using OpenMPI has to
work on other systems not using OpenMPI.