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Subject: Re: [OMPI users] Bad Infiniband latency with subounce
From: Terry Frankcombe (terry_at_[hidden])
Date: 2010-02-15 22:44:18


On Mon, 2010-02-15 at 20:18 -0700, Ralph Castain wrote:
> Did you run it with -mca mpi_paffinity_alone 1? Given this is 1.4.1, you can set the bindings to -bind-to-socket or -bind-to-core. Either will give you improved performance.
>
> IIRC, MVAPICH defaults to -bind-to-socket. OMPI defaults to no binding.

Is this sensible? Won't most users want processes bound? OMPI's
supposed to "to the right thing" out of the box, right?