Manual:$wgMemoryLimit

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Miscellaneous settings: $wgMemoryLimit
The minimum amount of memory that MediaWiki "needs";
MediaWiki will try to raise PHP's memory limit if it's below this amount.
Introduced in version: 1.16.0 (r54339)
Removed in version: still in use
Allowed values: Shorthand byte notation
Default value: "50M"
Other settings: Alphabetical | By function

Details[edit]

The minimum amount of memory that MediaWiki "needs"; MediaWiki will try to raise PHP's memory limit if it's below this amount.

Notes[edit]

A check in Setup.php gets run on every page view to make sure that PHP's memory limit is at least this amount. If it's lower, MediaWiki will use ini_set() to raise it if it can.

The installation script used to insert ini_set( 'memory_limit', '20M' ); in LocalSettings.php if the memory limit was below 20M. This led to problems when people raised the memory limit for their server later and found that it was mysteriously overridden.