Since we moved to PHP 5.5 and it’s built in zend opcache, we decided to stop using APC.
Since zend opcache filled opcaching need only, we needed something for data-cache. There is one APC fork trying to extract data-caching code on Github. But we wanted something stable and mature so we choose to go with memcache.
I always hated presence of php5-memcache and php5-memcached – two solutions for similar needs. I read this and this and many more threads but could reach a conclusion.
Actually for our trivial needs both extensions should work fine. But we (forced) to choose php5-memcache as w3-total-cache doesn’t support only this!
Installation
apt-get install memcached php5-memcache service php5-fpm restart
Config
Increase Max Memory memcache can use
By default, its 64MB. You may need more.
- Open
/etc/memcached.conf - Look for value
-m 64 - Change it to
-m 1024 - Restart memcached
service memcached restart
Move PHP’s session storage to memcache
Open /etc/php5/mods-available/memcache.ini
Add following lines:
session.save_handler = memcache session.save_path = "tcp://localhost:11211"
Extra: Since memcached can works in multiserver mode, you can share session across server. Google for more info on this. I will post our config when we will write one! 😉
Changes in w3-total-cache plugin
In w3-total-cache plugin you need to choose memcache as backend for object-cache and database-cache.
Web-based Stats Viewer for Memcache
There are many but we choose phpmemcacheadmin
cd /var/www/example.com/htdocs/ mkdir mem && cd mem wget http://phpmemcacheadmin.googlecode.com/files/phpMemcachedAdmin-1.2.2-r262.tar.gz tar -xvzf phpMemcachedAdmin-1.2.2-r262.tar.gz chmod +r * chmod 0777 Config/Memcache.php
