[Beowulf] Performance characterising a HPC application

[Eugen Leitl]

On Sat, Mar 24, 2007 at 11:08:32AM -0400, Douglas Eadline wrote:

> 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'm familiar with that requirement, yes.
 
> > 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).

Vanilla netpipe, stock Linux kernel? That's a very good result,
given that GAMMA with Broadcoms is only slightly better.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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