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A [[wp:PHP_accelerator|PHP Acelerator]] is a tool that will enhance the [[Performance_tuning|performance ]] of web applications written for the PHP scripting language. The free [http://php.net/apc Alternative PHP Cache] (APC) is distributed as a PEAR package.
If you run your own LAMP server with PHP applications, then please install it. The [[Moodle]] documentation includes information on [http://docs.moodle.org/en/Installing_APC_in_Windows setting up APC]; including testing before and after performance with "[http://httpd.apache.org/docs/2.0/programs/ab.html Apache Bench]"
== Installation ==
sudo ln -s /usr/share/php/apc.php
</source>
== MediaWiki ==
MediaWiki can take advantage of the APC cache if you tell it to.
see [[mw:Manual:Configuration_settings#Cache|The Manual for cache settings]], and set [[mw:Manual:$wgMainCacheType]] in LocalSettings.php:
<source lang="php">
$wgMainCacheType = CACHE_ACCEL;
</source>
== Troubleshooting ==
If you notice sluggishness in your site after installing APC, then check out the front-end (apc.php). The sure sign that you need to increase your cache size is that the "cache full" count is greater than one.
[[Image:Apc-problems.png|200px|thumb|right|Cache is too small]]
# [[Performance_tuning|Check your memory]]
# Increase the Shared Memory Size for APC in your php.ini file e.g. <code>apc.shm_size = 128</code>
# Restart Apache
# Use the Apache Bench tool to test performance with and without APC enabled.
== Notes ==
APC, aside from speeding up your website, also provides a storage mechanism outside the traditional cookie/session mechanism. So, you could set an application variable or constant and (assuming that the cache is not cleared, etc.) retrieve that value from another context.
[[Category:Apache]]
[[Category:PHP]]
