[gmx-users] Hyperthreading on or off?
hseara at netscape.net
Sat Feb 11 01:02:40 CET 2006
I have a short question. I've bought 5 nodes of dual Xeon 3.2 for
running gromacs connected by a gigabit switch. I have been performing
some benchmarks using PME & Gromacs-3.3 & Lam-7.1.1 and the performance
is very poor when using more than 2 nodes ( in fact 3 or more nodes
perform nearly equal than 2 nodes that performs quite well). Looking at
CPU consuming mean value during calculation its around 20%. I have
hiperthreading on. Can it be the cause of this poor performance? do you
recommend to switch it off?. Any other suggestion to improve the
performance, because with this results I can't send any job using more
than 4 CPU's what is terrible for the system I want to simulate.
Any help will be fantastic,
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