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Subject: Re: [OMPI users] openmpi over tcp
From: Peter Kjellstrom (cap_at_[hidden])
Date: 2009-01-30 04:45:56


On Thursday 29 January 2009, Ralph Castain wrote:
> It is quite likely that you have IPoIB on your system. In that case,
> the TCP BTL will pickup that interface and use it.
...

Sub 3us latency rules out IPoIB for sure. The test below ran on native IB or
some other very low latency path.

> > # OSU MPI Latency Test v3.1.1
> > # Size Latency (us)
> > 0 2.41
> > 1 2.66
> > 2 2.85

/Peter