[Beowulf] Again about NUMA (numactl and taskset)
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Chris Samuel csamuel at vpac.orgMon Jun 23 22:56:34 PDT 2008
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----- "Greg Lindahl" <lindahl at pbm.com> wrote: > > 3) Is there some reason to use things like > > mpirun -np N /usr/bin/numactl <numactl_parameters> my_application > ? > > Your MPI (and OpenMP) should do this for you. Although not always correctly, it may assume that it can allocate from core 0 onwards leading to odd performance issues if you happen to get two 4 CPU jobs running on the same node.. -- Christopher Samuel - (03) 9925 4751 - Systems Manager The Victorian Partnership for Advanced Computing P.O. Box 201, Carlton South, VIC 3053, Australia VPAC is a not-for-profit Registered Research Agency
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