PHP Accelerator: Difference between revisions
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[[Image:Preferences-system-performance.svg|200px|frameless|right]] | |||
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. | 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. | ||
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== MediaWiki == | == MediaWiki == | ||
MediaWiki can take advantage of the APC cache if you tell it to. | 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:$wgMainCacheType]] in LocalSettings.php: | see [[mw:Manual:Configuration_settings#Cache|The Manual for cache settings]], and set [[mw:Manual:$wgMainCacheType]] in LocalSettings.php: | ||
<source lang="php"> | <source lang="php"> | ||
$wgMainCacheType = CACHE_ACCEL; | $wgMainCacheType = CACHE_ACCEL; | ||
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== Troubleshooting == | == 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. | 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]] | [[Image:Apc-problems.png|200px|thumb|right|Cache is too small]] | ||
# [[Performance_tuning|Check your memory]] | # [[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> | # Increase the Shared Memory Size for APC in your php.ini file e.g. <code>apc.shm_size = 128</code> | ||
# Restart Apache | # Restart Apache | ||
# Use the Apache Bench tool to test performance with and without APC enabled. | # Use the Apache Bench tool to test performance with and without APC enabled. | ||
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Connection Times (ms) | Connection Times (ms) | ||
min mean[+/-sd] median max | |||
Connect: 1 1 0.1 1 2 | Connect: 1 1 0.1 1 2 | ||
Processing: 515 604 113.4 567 1030 | Processing: 515 604 113.4 567 1030 | ||
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Percentage of the requests served within a certain time (ms) | Percentage of the requests served within a certain time (ms) | ||
50% 568 | |||
66% 600 | |||
75% 608 | |||
80% 644 | |||
90% 734 | |||
95% 925 | |||
98% 1031 | |||
99% 1031 | |||
100% 1031 (longest request) | |||
</pre> | </pre> | ||