Date: Fri, 21 Jan 2005 08:44:46 -0500 From: Gardner Bell <gbell72@rogers.com> To: stheg olloydson <stheg_olloydson@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: Thread Scheduling Message-ID: <20050121134446.GB77496@gardnerbell.ca> In-Reply-To: <20050121054859.40902.qmail@web53908.mail.yahoo.com> References: <20050121054859.40902.qmail@web53908.mail.yahoo.com>
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On Thu, Jan 20, 2005 at 09:48:59PM -0800 stheg olloydson wrote: > it was said: > > <snip> > > >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. > > <snip> > > Hello, > > 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. > Thanks for your reply, I do have more questions regarding this so I'll ask away on the performance list. Gardner
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