Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets)

On Sun, May 07, 2006 at 08:57:21PM +0100, Robert Watson wrote:

On Sun, May 07, 2006 at 10:00:41PM +0300, Sven Petai wrote:

The results in my mail were mean values over 2 runs,
only once did I see really huge (more than 10%) differences between
several
subsequent runs with same settings, this case was clearly mentioned in
the results.

FYI, 2 is not really enough, you should do at least 10 repetitions of each
test to reduce variance (which can be a lot, despite what you saw!) and so
that differences between them can be accurately estimated. Ministat is
really helpful for this.

Typically, I do 12 runs of supersmack in each configuration, and discard
the first 2 runs in which the cache and scheduler (etc) are still settling,
as I'm interested in the steady state.

Yeah, forgot to mention that too. Also keeping in mind that mysql
performance is not time-constant, e.g. you should restart it in
between test configurations instead of comparing early and late times.

Kris

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