Date: Sat, 22 May 2004 05:45:20 -0700 From: JG <amd64list@jpgsworld.com> To: freebsd-threads@freebsd.org Subject: Re: Why is MySQL nearly twice as fast on Linux? Message-ID: <5.2.0.9.2.20040522052606.0156fd70@mail.ojoink.com> In-Reply-To: <40AEFA5E.7060603@he.iki.fi> References: <5.2.0.9.2.20040521154458.01627688@127.0.0.1> <5.2.0.9.2.20040521154458.01627688@127.0.0.1>
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At 09:59 AM 5/22/2004 +0300, you wrote: >JG wrote: > >> >> >>Do you have any suggestions or ideas as to what the problem is? > >I failed to find benchmark numbers using libpthread or libthr. Did you >have some and I just missed them? > >Pete Pete, 90% of the benchmarks I did were done with libptherads. I haven't personally tested with libthr, but others have and their results were poor as well. I wanted to avoid reposting pages of benchmarks, but I guess it's not going to happen. I'll start posting mine here here soon, I'm going to retest everything local with super-smack and run-all-tests today. You can also see Mikes run-all-tests benchmarks here: http://mikehost.com/~mike/tmp/bench.htm Here is a quote from an email Chris Elsworth sent me: "Just had a read through the web archive, all seems very familiar :) A colleague and I spent hours fiddling with the various threading libraries; kse, libc_r, libthr, linuxthreads I think were the main ones - I mostly tweaked MySQL, he tweaked the threading libraries, and nothing made any significant difference, so I'm not really convinced this is even a threading problem - I don't see why all the threading libraries we tried all struggle to outperform Linux's default configuration on the same hardware." Here is Chris Elsworths post to the MySQL general mailing list: http://lists.mysql.com/mysql/165908 Here is an article at 2cpu.com showing how Linux improved 20%: http://www.2cpu.com/articles/98_4.html ... But I wish I knew how he ran super-smack, those numbers are insane. And my original posts to the FreeBSD AMD64 list are here: http://lists.freebsd.org/pipermail/freebsd-amd64/2004-May/ Scroll down to: "Why is MySQL nearly twice as fast on Linux/AMD64 Vs. FreeBSD/AMD64? A lot of top posts so it got broken up a few times. -----------------------------------------------------------------------------------------------
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