Date: Wed, 26 Oct 2005 12:02:02 +0200 From: Xander Damen <xdamen@sci.kun.nl> Cc: current@freebsd.org Subject: Re: MySQL Performance 6.0rc1 Message-ID: <435F541A.7050107@sci.kun.nl> In-Reply-To: <1130320668.810.87.camel@spirit> References: <435F48DA.6060009@kernel32.de> <1130320668.810.87.camel@spirit>
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There was a similar discussion on stable a while back: http://lists.freebsd.org/pipermail/freebsd-stable/2005-June/015874.html which continued on performance: http://lists.freebsd.org/pipermail/freebsd-performance/2005-June/001403.html -- Xander Xin LI wrote: > Hi, Marian, > > 在 2005-10-26三的 11:14 +0200，Marian Hettwer写道： > >> Hi Folks, >> >> I'm using RC1 on some of my test servers and workstations. So far, it >> runs very good (as in stable and fast) :) >> However, I thought of doing a small benchmark of MySQL in comparison to >> Linux 2.6.8 (Debian Sarge) and the results are kinda... shocking. >> > [...] > >> Any Ideas where this huge difference comes from? Did I oversee some >> debugging features still active in RC1 ? >> > > There are many factors that can affect the performance of MySQL. Would > you please post the output of "dumpfs /var | head -n 21" on your server? > (Replace /var with whatever mountpoint that your database is stored in). > > Some observations that I think can affect MySQL performance: > - Our malloc(3) implementation might be sub-optimal for the workload. > - Lack of some POSIX system call which was implemented in other ways > (e.g. we do not have fsyncdata yet) > - Some detailed implementation difference between our and Linux's > threading library, or MySQL itself. > > I think David (davidxu@) had worked on performance of MySQL and he may > have some suggestions. > > BTW. What file system are you using on your Debian test? What's the > mount options? > > Cheers, >
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