Yeah, there were 25 pollers (good lord) that triggered the mysqld jobs which in turn caused a logjam in the pages waiting to be written to disk. Lowering the ratios on the dirty pages and the poller number back down to 5 cleared it up. Lesson learned, increasing the RAM can sometimes negatively affect other ares.
On Oct 26, 2015, at 1:18 PM, Adam Armstrong <adama@memetic.orgmailto:adama@memetic.org> wrote:
That sounds... complicated.
adam.
On 26/10/2015 17:14:56, Johnson, Edward A. <eajohnson@prf.orgmailto:eajohnson@prf.org> wrote:
Turned out to be a balance issue between the number of pollers, the vm.dirty_background_ratio, and the vm.dirty_ratio.
On Oct 26, 2015, at 11:17 AM, Johnson, Edward A. <eajohnson@prf.orgmailto:eajohnson@prf.org> wrote:
I’ve also noticed that in iotop after the following command runs like 5 or more iterations simultaneously, the dirty pages to be written gets to over 25000:
mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql ~var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
On Oct 26, 2015, at 8:36 AM, Johnson, Edward A. <eajohnson@prf.orgmailto:eajohnson@prf.org> wrote:
Since upgrading PHP to 5.4, Observium has loaded very slowly at times. Most of the time just a refresh of the homepage will take .150 seconds but occasionally it can take up to a minute to load. Running iotop shows the Flush process running taking up 99.99% IO which directly correlates to the slow page loads. Can anyone shed some light on a way to resolve this? _______________________________________________ observium mailing list observium@observium.orgmailto:observium@observium.org http://postman.memetic.org/cgi-bin/mailman/listinfo/observium
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