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From: Lydia Heck (lydia.heck_at_[hidden])
Date: 2007-02-23 07:29:11

I was asked by a user if the MPI allreduce recognizes when
process ids are situated on the same node so that the communication
can then proceed over shared memory rather over the slower networking
communication channels.

Would anyone of the openmpi developers be able to comment on
that question and situation on that in openmpi?


Dr E L Heck

University of Durham
Institute for Computational Cosmology
Ogden Centre
Department of Physics
South Road

United Kingdom

e-mail: lydia.heck_at_[hidden]

Tel.: + 44 191 - 334 3628
Fax.: + 44 191 - 334 3645