Hardware and performance

Hi

I just did an upgrade from moodle 2.6 to 2.9.

I notice that Moodle runs quite a bit slower. It takes 8-9 seconds to load the index page. I think it took 3 seconds on moodle 2.6.

I`m running php 5.5 and MYSQL 5.6. Opcache is enabled as per: https://docs.moodle.org/26/en/OPcache
Also I disabled session storage in database. 

The server has 4GB ram, Xeon e5-2630. I also followed the performance write up, but couldnt find much to improve.

If i let top running during a page load, I see this:

[code]

Tasks: 135 total,   7 running, 128 sleeping,   0 stopped,   0 zombie

Cpu(s): 17.1%us, 39.1%sy,  0.0%ni, 43.3%id,  0.0%wa,  0.0%hi,  0.1%si,  0.4%st

Mem:   4099296k total,  3947360k used,   151936k free,   327268k buffers

Swap:  4194296k total,    12696k used,  4181600k free,  2088576k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

 1901 aflhmood  20   0  394m  77m  50m R 34.5  1.9   0:03.31 httpd

 1847 aflhmood  20   0  396m  75m  46m R 21.6  1.9   0:04.02 httpd

 1940 aflhmood  20   0  401m  88m  57m R 21.6  2.2   0:03.51 httpd

 1899 aflhmood  20   0  395m  69m  41m R 20.9  1.7   0:01.98 httpd

 1904 aflhmood  20   0  398m  84m  54m R 20.9  2.1   0:03.37 httpd

 1943 aflhmood  20   0  393m  68m  42m R 20.9  1.7   0:02.69 httpd

24193 mysql     20   0 1780m 588m 9156 S  2.7 14.7   3:23.51 mysqld

[/code]

For some reason, the CPU load is quite high. I think caching in not working optimally.

Cache performance output (I dont know how to read the output since I have nothing to compare with)

Store requests when used as an application cache.

Store requests when used as a session cache.

Store requests when used as a request cache.