Date: Wed, 25 Jan 2006 17:56:59 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Christopher Arnold <chris@arnold.se> Cc: current@freebsd.org Subject: Re: MySql and timekeeping? Message-ID: <20060125175504.Q70912@fledge.watson.org> In-Reply-To: <20060125182006.I94600@home.arnold.se> References: <20060125182006.I94600@home.arnold.se>
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On Wed, 25 Jan 2006, Christopher Arnold wrote: > some time ago there was some discussions regarding MySql and timekeeping. > > There was some ideas of using lower resolution when doing timekeeping to > keep the timekeeping cost down. Has anything been done in this area? > > Or should we stick to using Linux as our MySql platform? > > While we are at it, have anyone done a recent comparison of the MySql > performance under Linux and FreeBSD? I added new clock_gettime() variants that allow retrieval of a low accuracy low granularity on -CURRENT, time stamp at low cost. I also wrote a small wrapper library to allow people to compare before/after with various benchmarks. I never really heard back from anyone authoritatively. phk has also been circulating patches that reduce general CPU accounting measurement in the CPU by switching to a different definition of CPU time, which should also affect MySQL significantly, especially when running the MySQL benchmark client and server on the same hardware. Robert N M Watson
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