Date: Sun, 7 May 2006 14:23:12 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Robert Watson <rwatson@FreeBSD.org> Cc: Sven Petai <hadara@bsd.ee>, freebsd-performance@freebsd.org, performance@freebsd.org, current@freebsd.org Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <20060507182312.GA185@xor.obsecurity.org> In-Reply-To: <20060507190844.K46997@fledge.watson.org> References: <20060506150622.C17611@fledge.watson.org> <200605071949.54978.hadara@bsd.ee> <20060507190844.K46997@fledge.watson.org>
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[-- Attachment #1 --] On Sun, May 07, 2006 at 07:16:34PM +0100, Robert Watson wrote: > > On Sun, 7 May 2006, Sven Petai wrote: > > >I performed tests on a 4 * dualcore 2Ghz opteron system (so 8 cores in > >total). > > > >In general with 10 parallel smacker threads the performance seems to go up > >with your patch by ~44% and with 100 parallel threads it goes down ~25% > > This is an interesting effect I need to explore. Kris reported much > increased contention on locks within the process (between threads) when > running with my patch. It would be interesting to know what the effect on > average query time is -- perhaps it has gone down and we're looking at > increased scheduler related contention. > > I noticed the results in the tests seem somewhat variable. I've noticed > that MySQL bennchmarking is heavily affected by test run time and order. > It's not atypical when running a series of identical tests to see a first > result half the end rate, a second result *better* than the end rate, and > then it balance out between the two. For example, I see the following on a Also, I see a slow but statistically significant deterioration in performance over time. Maybe mysql's memory is getting fragmented or something. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEXjsQWry0BWjoQKURAtNGAJ0fM1JzVK9Rbj5c+7bunFj6oVGL/ACdFY+B gnscH3roaT5uePFlo4ek4vo= =af63 -----END PGP SIGNATURE-----
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