Edgar,
Thank you. I was using MPI_ROOT in a MPI_Bcast call from the parent
process where I spawn subprocesses and it worked fine in OpenMPI but
when it didn't work on another platform and the support engineers
solution was to define it as zero I started looking and couldn't find
anything close to what you said below in the four books I have. Page
236 of Using MPI-2 shows the correct use of MPI_ROOT but no
explanation of why.
Michael
On Mar 27, 2006, at 10:21 AM, Edgar Gabriel wrote:
MPI_ROOT is required for the rooted operations of the inter-
communicator
collectives in MPI-2, I am not aware of that you need MPI_ROOT in
intra-communicator collectives as defined in MPI-1.
Thanks
Edgar
Michael Kluskens wrote:
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.
Michael
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