Date: Thu, 20 Jan 2005 21:48:59 -0800 (PST) From: stheg olloydson <stheg_olloydson@yahoo.com> To: gbell72@rogers.com Cc: freebsd-questions@freebsd.org Subject: Re: Thread Scheduling Message-ID: <20050121054859.40902.qmail@web53908.mail.yahoo.com>
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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. HTH, stheg __________________________________ Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard. http://promotions.yahoo.com/new_mail
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