Re: Benchmark MySQL Performance On FreeBSD And Linux

Scott Long <scottl@xxxxxxxxxx> · Fri, 16 Dec 2005 17:21:50 -0700

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.
Scott
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