Date: Tue, 15 Jun 2004 16:22:39 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: JG <amd64list@jpgsworld.com> Cc: freebsd-threads@freebsd.org Subject: Re: Possible Threading problem with -CURRENT / MySQL? Message-ID: <Pine.BSF.4.21.0406151620570.50415-100000@InterJet.elischer.org> In-Reply-To: <5.2.0.9.2.20040614183523.015cdaa0@mail.ojoink.com>
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On Mon, 14 Jun 2004, JG wrote: > > I just posted this to -AMD64 and someone brought this discussion to my > attention... > anyway I'll repost it here since it seems to be a more relevant discussion: > > > I got a couple emails from people telling me I should retest > because some changes have been committed recently that > might effect my MySQL benchmarks. > > Well I just did a buildworld and kernel to -CURRENT & it did > effect the results alright... just not the way we wanted them to: erk! :-) As I suggested elsewhere: ----- quoted---- To check this you should try running systat -vmstat while noticing the slowdown and try see what is at 100%. if it turns out that you are NOT seeing disk or CPU limitted then the next step would be to take a snapshot of operations using ktrace -d -p (pid) for 20 second followe by krtace -C to turn it off again. then looking at the output may give an idea of what operations are taking too long, and what is waiting on what.. Julianhome | help
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