[Beowulf] VMC - Virtual Machine Console
reuti at staff.uni-marburg.de
Sun Jan 27 03:17:12 PST 2008
Am 21.01.2008 um 04:20 schrieb Rayson Ho:
> On Jan 18, 2008 5:53 PM, Bernard Li <bernard at vanhpc.org> wrote:
>> -- but I'd also like to hear whether there are any general
>> 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.
> 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.
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