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Subject: [OMPI users] Loopback Communication
From: Elvedin Trnjanin (trnja001_at_[hidden])
Date: 2008-02-29 18:25:50


I'm using a "ping pong" program to approximate bandwidth and latency of
various messages sizes and I notice when doing various transfers (eg.
async) that the maximum bandwidth isn't the system's maximum bandwidth.
I've looked through the FAQ and I haven't noticed this being covered but
how does OpenMPI handle loopback communication? Is it still over a
network interconnect or some sort of shared memory copy?

- Elvedin