Manual:$wgFileCacheDirectory/ja

詳細
サーバー側のファイルキャッシュ をオンにすると、この変数を使用して、キャッシュされたページをサーバーファイルシステム上のどこに保存するかを指定できます.

It's an absolute path, so you could specify somewhere under /tmp for example:

...but you can specify this absolute path in relation to other directory path variables, e.g.:

This specifies a "cache" directory under the image uploads directory (normally called "images"). This is the default setting in fact.

In some versions, you must create the directory and ensure it is writeable (by the php user). This is even true if you leave it as the default (you must create e.g. the "images/cache" directory). It appears that in at least 1.15+ the directory will be created for you if it can be.

If you are hosting multiple wikis from a shared source, you must ensure each has its own separate cache directory to avoid mis-serving pages with the same name (the Main Page, for example).

関連項目

 * - Enabling file caching
 * - Depth of the subdirectory hierarchy to be created under $wgFileCacheDirectory.
 * - Depth of the subdirectory hierarchy to be created under $wgFileCacheDirectory.