stheg_olloydson at yahoo.com
Thu Jan 20 21:49:00 PST 2005
it was said:
>My question is, will I notice any performance improvement by using the
>new scheduler opposed to the 4.4BSD scheduler on an SMP system and can
>the new scheduler be utilized on a single processor system? The
>intended use of the SMP system is for MySQL databases only.
I asked about the new scheduler on the performance list. Below is
(posted on list) reply:
>FWIW, one of the reasons that there hasn't been as much
>interest in SCHED_ULE lately is likely that several of the
>features previously only present in SCHED_ULE are now also
>present in SCHED_4BSD -- for example, making more effective
>uses of IPIs in reducing latency during inter-process
>communication across processors. While SCHED_ULE does contain
>a number of interesting things not present in SCHED_4BSD, the
>4BSD scheduler has hardly gone un-improved in that time.
>However, Jeff Robserson does seem to have picked up recently
>on both VFS SMP locking and ULE. The scheduler tracing and
>visualization tools he committed a couple of weeks ago are
>really quite neat tools.
>Robert N M Watson
So we'll just have to wait until ULE is fully baked to see which
scheduler is best for a given application. For a more definitive
answer, you may want to ask directly on the performance list.
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