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Subject: Re: [OMPI users] Factor of 10 loss in performance with 1.3.x
From: Iain Bason (Iain.Bason_at_[hidden])
Date: 2009-04-07 10:24:30

There are a bunch changes in the shared memory module between 1.2.9
and 1.3.1. One significant change is the introduction of the "sendi"
internal interface. I believe George Bosilca did the initial
implementation. This is just a wild guess, but maybe there is
something about sendi that increases latency when using the shared
memory module.