[Beowulf] Again about NUMA (numactl and taskset)

Chris Samuel csamuel at vpac.org
Tue Jun 24 01:56:34 EDT 2008


----- "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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