From: John P. <jwp...@gm...> - 2008-09-09 15:00:07
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On Tue, Sep 9, 2008 at 9:44 AM, Tim Kroeger <tim...@ce...> wrote: > Dear all, > > On Tue, 9 Sep 2008, Benjamin Kirk wrote: > >>> There are about 120 nodes with 2 CPUs each. Please find attached the >>> content of /proc/cpuinfo of one of these nodes (should be typical for >>> all of them). When I run with n CPUs, I usually mean that I run on >>> n/2 nodes using both CPUs each (although there is also the possibility >>> to use one CPU per node only). >> >> If you have not done so already it would be instructive to see how using >> one >> CPU per node performs. > > Attached is the output with 20 nodes and 1 CPU per node. Unfortunately, it's > even slower than 10 nodes with 2 CPUs each. Interesting. And you have exclusive access to these nodes via some sort of scheduling software? There's no chance that some other user's code could be running at the same time and affecting the results? -- John |