Manual:$wgMemoryLimit/de-formal

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

Details

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

Notes

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.