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.
However, unless you're in a rush you might want to wait until
November when Intel is rumored to ship Harpertown (Penryn quad-core)
with more cache, higher frequencies, and lower price. AMD will also
release Barcelona (true quad-cores) in September, with higher
frequencies expected in october/november.
Cheers,
Erik
On Aug 24, 2007, at 12:53 AM, Alan Chen wrote:
If anyone has some gromacs benchmarks numbers they'd be willing to
share from clovertown
quad cores. .. we're having to decide between buying 3.0 ghz DPDC
woodcrest nodes (which
we already have several of and are quite happy with) vs 2.66 ghz DP/
QC clovertowns for the same price.
I haven't seen any clovertown results in the benchmark page or in
past listserv messages. .
Obviously, we don't expect the clovertowns to scale perfectly for
single jobs due to the architecture, but I'm very
curious how they do with multiple jobs on the same node - we tend
to run lots of independent trajectories of medium
(~100,000 atom) sized systems in our lab.
If anyone can share their experiences with gromacs on clovertown
XEON systems it would be greatly appreciated!
Thanks!
Alan Chen
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