Agreed - although I must say that the Q6600 2.4GHz desktop single-
socket quad-cores are looking very nice too for small clusters. You
get a complete machine with memory and everything for ~$800, and
apparently they overclock very well too :-)
Cheers,
Erik
On Aug 27, 2007, at 10:05 AM, Ansgar Esztermann wrote:
On Fri, Aug 24, 2007 at 09:56:32AM +0200, Erik Lindahl wrote:
Hi,
Quad-core is the way to go. I recently benchmarked the scaling of the
CVS version, and with 8 independent jobs we get 85-97% throughput
scaling, depending on the type of simulation. And you get essentially
the same performance if you run two jobs using 4 cores each.
Even for a single simulation parallelizing over all 8 cores (lots of
communication), the scaling is 70-90% with CVS.
I'll second that. With our systems, we got around 80% scaling on 8
cores as well. Considering the relatively low price of the quads, I'd
definitely go with the quads.
Besides, density might be an issue as well: a single unit in a 19"
rack can easily cost 1k$ or more, so doubling the density may save a
lot of money.
A.
--
Ansgar Esztermann
Researcher & Sysadmin
http://www.mpibpc.mpg.de/groups/grubmueller/start/people/aeszter/
index.shtml
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