Date: Tue, 10 Sep 2002 13:30:23 -0400 (EDT) From: hackers@d.sparks.net To: Dominic Marks <dominic_marks@btinternet.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Dell 2650 SMP perf question Message-ID: <Pine.BSF.4.21.0209101326250.52716-100000@search.sparks.net> In-Reply-To: <20020910172724.GB889@gallium>
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On Tue, 10 Sep 2002, Dominic Marks wrote: > On Tue, Sep 10, 2002 at 01:16:40PM -0400, hackers@d.sparks.net wrote: > > Hi All; > > > > Hyperthreading is turned off, I believe. There aren't any > > "hyperthreading" swithes in the bios I could find, but the "logical > > processor" option is turned off. > > > > > > Clues why SMP is so much slower very welcome indeed. > > I believe at some point in the not too distant past their have been many > performance problems for people using MySQL on FreeBSD. These problems > where mostly related to MySQL's use of threads, I don't know if these > problems have been fully resolved but it could be that SMP is > aggrevating this. Watching what MySQL is doing with a trace might show > some interesting results. Threads, mysql, and FreeBSD have been an unsocial group for a while, and running two processes that access the same tables does seem to slow things down a lot. Tracing it might show something of interest to someone, and I'm happy to do it if it will help. I wouldn't have a clue what I was looking at, and couldn't fix it if I did. > I suppose you're running the lastest version of MySQL ? I've tried 4.03b, 4.02a, and 3.23.x, all show similar results:( Thanks, --- David To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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