id summary reporter owner description type status priority milestone component resolution keywords cc estimatedhours hours billable totalhours 554 Site slow down and MySQL load increase chris chris "Since the upgrade to [http://blog.mariadb.org/mariadb-5-5-31-now-available/ MariaDB 5.5.31], done on ticket:218#comment:93 (and fixed on ticket:548#comment:32) there appears to have been been a noticeable slowdown in the time for pages to be generated, measuring with http://tools.pingdom.com/fpt/ the front page alone takes around 5 seconds to generate. There is a clear increase in the amount of MySQL/MariaDB activity measured by Munin, see the attached graphs, the upgrade was done around midday on 24th May 2013. There has also been a increase in traffic according to the firewall graphs. The memory usage of redis has also dropped right down and the database memory usage has significantly increased. It's not totally clear if the cause of this change in behaviour of the site is related to the MySQL/MariaDB upgrade or if there was a coincidental change in the traffic to the site at the same time. There is no noticeable change in the visitors recorded in the Piwik stats. According to pingdom the front page of the site is now ""slower than 77% of all tested websites"" with a total load time of around 6 seconds, almost all of this is down to the wait of around 5 seconds for the index.php file. This can also be tested from parrot with Apache bench, sometimes cached pages are served up and these appear in an instance, if the front page is generated it takes around 5 seconds, see wiki:LoadTimes#a2013-05-28 " maintenance closed major Maintenance Live server fixed ed jim 0.0 0 1 0.75