On Mon, Oct 19, 2009 at 5:52 AM, Sergei Golubchik <sergii@pisem.net> wrote:
Hi, Monty!
On Oct 19, Michael Widenius wrote:
I just finished applying / modifying / rewriting the userstats patch to MariaDB 5.2 and will commit this in a moment.
I wonder if anybody cares to monitor mutex usage in MySQL.
This patch adds few new global mutexes that are locked at least once per statement (or more).
Without benchmark results one can only speculate whether it will affect users or not.
I am willing to bet that Monty's patch makes sysbench readonly much slower with high concurrency on an 8-core server. But those problems have been fixed in recent versions of the patch. Is MySQL or MariaDB going to run and publish performance regression results for each release/feature? I would love for that to happen, but then I will have less to write about. -- Mark Callaghan mdcallag@gmail.com