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Re: single thread performance (was: Re: Need to check if the slowdown is still there)


Hi Axel,

On Tue, Jan 28, 2014 at 04:27:10PM +0100, Axel Schwenke wrote:
> Hi,
> I have now re-run a benchmark to test single thread performance. This is the
> continuation of MDEV-4309.
Thanks for the data.

> ...

> The numbers demonstrate quite clearly the general observation that with each
> new major version of MariaDB/MySQL the code path becomes longer and the
> performance suffers. But there is also good news: sometimes during the
> maturing of a release the performance may increase again. I.e. I have seen
> significant changes from MySQL-5.6.13 to 5.6.14. 
I agree with the observations. I would even say that MySQL was getting worse
in 5.6.11 - 5.6.13 versions, and then fixe something in 5.6.14.

> Also from MariaDB-5.5.30 to
> 5.5.31 (which was when MDEV-4309 was implemented). Unfortunately between
> MariaDB-5.5.33 and 5.5.34 most of that was lost again :(

The first step in not letting that happen is to have the benchmark data so that
we know if there are any problems.

The patch for MDEV-4309 part#2 is not yet ready. We will get back to you when
it can be used for testing.

Sergei Petrunia, Software Developer
MariaDB | Skype: sergefp | Blog: http://s.petrunia.net/blog