[Beowulf] Home beowulf - NIC latencies

Joachim Worringen joachim at ccrl-nece.de
Thu Feb 10 04:15:54 EST 2005


Patrick Geoffray wrote:
> Seriously, here are MPI latencies with MX on F cards on Opteron (PCI-X), 
> that includes fibers and a switch in the middle:
> 
>    Length   Latency(us)    Bandwidth(MB/s)
>         0       2.684          0.000
[...]

Nice work, Patrick - but such numbers are of little value if the 
benchmark used to get them is not stated. I'd recommend mpptest (from 
MPICH). Plus, the compiler etc. is also of interest when it comes to 
latencies.

   Joachim

-- 
Joachim Worringen - NEC C&C research lab St.Augustin
fon +49-2241-9252.20 - fax .99 - http://www.ccrl-nece.de
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