I run a busy high traffic and high community participation site, so MySQL has always run very high on my server. But after upgrading to v4.3 (no other change), my CPU load tripled, and it's crippling the server, causing frequent crashes and generally degraded responsiveness.
The site is hosted on a high end dedicated server with 4 SSD drive in hardware RAID. I spoke with my host and they assured me no changes have been done to the server, and all server side applications are up to date.
Problems started after the update to v4.3, No other change whatsoever has been done to neither the WP installation, nor the server itself.
My log shows high http connection count, which use abnormally high CPU never seen before:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
17368 mysql 20 0 9348m 441m 6852 S 42.0 1.8 8:35.43 mysqld
17941 xxxxx 20 0 1474m 54m 4748 S 27.5 0.2 0:10.38 httpd
18526 xxxxx 20 0 1463m 43m 4680 S 27.1 0.2 0:01.42 httpd
16675 xxxxx 20 0 1467m 46m 4284 S 24.8 0.2 0:17.30 httpd
16830 xxxxx 20 0 1463m 42m 4300 S 23.5 0.2 0:16.92 httpd
17777 xxxxx 20 0 1454m 34m 4780 S 23.5 0.1 0:11.56 httpd
18358 xxxxx 20 0 1460m 40m 4760 S 23.5 0.2 0:04.49 httpd
17881 xxxxx 20 0 1460m 40m 4716 S 23.2 0.2 0:09.88 httpd
18220 xxxxx 20 0 1441m 21m 4768 S 23.2 0.1 0:05.12 httpd
18472 xxxxx 20 0 1460m 40m 4748 S 23.2 0.2 0:04.12 httpd
18331 xxxxx 20 0 1505m 84m 4700 S 22.5 0.4 0:04.02 httpd
16892 xxxxx 20 0 1463m 43m 4316 S 22.2 0.2 0:09.67 httpd
16872 xxxxx 20 0 1441m 20m 4240 S 17.9 0.1 0:21.70 httpd
18248 xxxxx 20 0 1446m 26m 4756 S 16.9 0.1 0:03.51 httpd
16479 xxxxx 20 0 1461m 41m 4688 S 16.2 0.2 0:19.24 httpd
16870 xxxxx 20 0 1458m 37m 4216 S 16.2 0.2 0:16.59 httpd
18452 xxxxx 20 0 1474m 54m 4652 R 14.2 0.2 0:01.97 httpd
16729 xxxxx 20 0 1461m 40m 4208 S 12.2 0.2 0:18.65 httpd
16978 xxxxx 20 0 1455m 35m 4248 S 9.3 0.1 0:11.55 httpdCan anyone help me out with this? What happened? This is the first time I see my server getting crippled after a WP update and I've run this particular site on WP since 2008.