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Subject: Re: [OMPI users] Performance difference on OpenMPI, IntelMPI and ScaliMPI
From: Pavel Shamis (Pasha) (pashash_at_[hidden])
Date: 2009-08-05 10:07:25

> If the above doesn't improve anything the next question is do you know
> what the sizes of the messages are? For very small messages I believe
> Scali shows a 2x better performance than Intel and OMPI (I think this
> is due to a fastpath optimization).

I remember that mvapich was faster that scali for small messages (I'm
talking only about IB, no sm).
Ompi 1.3 latency is very close to mvapich latency. So I do not see how
Scali latency may be better than OMPI.