SCHED_ULE should not be the default
fidaj at ukr.net
Mon Dec 12 16:43:52 UTC 2011
В Mon, 12 Dec 2011 16:18:35 +0000
Bruce Cran <bruce at cran.org.uk> пишет:
> On 12/12/2011 15:51, Steve Kargl wrote:
> > This comes up every 9 months or so, and must be approaching FAQ
> > status. In a HPC environment, I recommend 4BSD. Depending on the
> > workload, ULE can cause a severe increase in turn around time when
> > doing already long computations. If you have an MPI application,
> > simply launching greater than ncpu+1 jobs can show the problem. PS:
> > search the list archives for "kargl and ULE".
> This isn't something that can be fixed by tuning ULE? For example for
> desktop applications kern.sched.preempt_thresh should be set to 224
> from its default. I'm wondering if the installer should ask people
> what the typical use will be, and tune the scheduler appropriately.
This is by and large does not help in certain situations ...
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