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Old 2011-09-02, 20:38   #3
fivemack
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Feb 2006
Cambridge, England

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The problem with process placement is how to get the currently-running processes, and more importantly their memory pages, off the CPUs ... there is probably some simple way, beyond 'for u in $(pidof gnfs-lasieve4I14e); do task set -p ffffff000000 $u; done', of evicting all the processes from half the CPUs (so freeing up two full sockets and eight memory channels for my MPI run), but I have the belief that that will leave the processes using physical memory attached to the empty sockets, so lots and lots of inter-processor traffic.
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