[Beowulf] Re: typical latencies for gigabit ethernet

Tom Elken tom.elken at qlogic.com
Mon Jun 29 19:44:36 EDT 2009


> > Ah! So my "real" latencies are 140/2 = 70 microsecs.
> 
> I see ping times of ~70μs between the nVidias I posted data on, and
> they
> have an MPI latency of ~12μs.  If you want a measurement/benchmark for
> MPI performance use IMB, like for the results I posted.

In addition to Intel MPI Benchmarks (formerly known as Pallas),
osu_latency is another common benchmark for MPI latency, part of the OSU MPI Benchmark (OMB) suite, available here:
http://mvapich.cse.ohio-state.edu/benchmarks/


-Tom

>  Otherwise
> people sometimes use netpipe.  If you want basic Ethernet (Layer 2)
> figures, look for Hughes-Jones' ethmon, somewhere under
> http://www.hep.man.ac.uk/.
> 
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