Hi,
Am 21.01.2008 um 04:20 schrieb Rayson Ho:
On Jan 18, 2008 5:53 PM, Bernard Li <[EMAIL PROTECTED]> wrote:
-- but I'd also like to hear whether there are any general
performance
benefits to setting CPU affinity. Do major schedulers support this?
Would this help with embarrassingly parallel jobs VS large MPI
jobs on
manycore machines?
I am working on adding processor affinity support for serial and
parallel jobs for Grid Engine, and I am working with the OpenMPI
developers to define an interface.
http://gridengine.sunsource.net/servlets/BrowseList?
list=dev&by=thread&from=27044
http://www.open-mpi.org/community/lists/devel/2008/01/2949.php
http://www.open-mpi.org/community/lists/devel/2008/01/2964.php
BTW, LSF 7.0.2 supports processor affinity for serial jobs. However,
supporting processor affinity for serial jobs is only useful when the
OS scheduler is dumb...
independent from any timing benefits: it will help to prevent users
to use more than the one granted slot. Some parallel libs are just
forking or using threads and don't need any qrsh to spawn a parallel
job. Nasty users can just use OpenMP with a thread count greater than
1 for now.
-- Reuti
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