Date: Fri, 16 Dec 2005 17:21:50 -0700 From: Scott Long <scottl@samsco.org> To: Gea-Suan Lin <gslin@gslin.org> Cc: freebsd-performance@freebsd.org, leo.huang.gd@gmail.com, Rink Springer <rink@il.fontys.nl> Subject: Re: Benchmark MySQL Performance On FreeBSD And Linux Message-ID: <43A35A1E.3020408@samsco.org> In-Reply-To: <20051216204322.GA66409@gslin.org> References: <20051216064615.GA41775@gslin.org> <20051216070609.GA3216@il.fontys.nl> <20051216204322.GA66409@gslin.org>
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Gea-Suan Lin wrote: > On Fri, Dec 16, 2005 at 08:06:09AM +0100, Rink Springer wrote: > >>>And you should disable these options, it may increase ~10% again: >>> >>>-cpu I486_CPU >>>-cpu I586_CPU >>> cpu I686_CPU >> >>A recent discussion on -STABLE warned against removing I586_CPU, refer >>to >>http://lists.freebsd.org/pipermail/freebsd-stable/2005-December/020696.html >>for more information. > > > Thanks, I'll try it later. > > BTW, did anyone try using jemalloc to test mysql ? > It was tried recently using supersmack and unix domain sockets. The results were slightly slower (around 6%, IIRC). The theory is that jemalloc doesn't pad out allocations as much, so there is high potential for cache line sharing (and thus cache thrash) between CPUs. Scotthome | help
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