> On Tue, Mar 20, 2007 at 01:03:58PM +0000, Mattijs Janssens wrote: > >> A non-intrusive test you could try is to replace your MPI (mpich) with a >> lower-latency one. Scali or MPI/Gamma are just to name two. These can >> lower >> your latency down to 15muS or so. > > Anyone been able to make MPI/Gamma work with the Broadcoms in SunFire > X2100 and X2100 M2 series?
You really need two networks for GAMMA as GAMMA turns off TCP while in use. Not to difficult with today's GigE-full nodes. Just need extra an extra switch. > > I just got a X2100 M2 machine in today. 4 GBit ports, though 2 of them > nVidia. I was able to get 17 usecond latency (netpipe TCP ) with the nvidia links on these systems. Out of the box broadcom was about 40 useconds (netpipe TCP). -- Doug > > -- > Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org > ______________________________________________________________ > ICBM: 48.07100, 11.36820 http://www.ativel.com > 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE > _______________________________________________ > Beowulf mailing list, [email protected] > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf > > !DSPAM:4604380a220209691080364! > -- Doug _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
