Compression/ru

На этой странице находится информация о сжатии данных, которое используется в MediaWiki.

Вывод
It is possible, with HTTP, to compress individual pages served. Both the browser and the server must support it, and it is normally negotiated, (with uncompressed version available). This is on by default if PHP has zlib support enabled (no Apache mods are required). The negligible CPU time spent compressing on the server is dwarfed by things like loading the PHP scripts, and the bandwidth savings are considerable.

Для более подробной информации смотрите Руководство:$wgUseGzip и Руководство:$wgDisableOutputCompression.

Статьи
On or about 2004-02-20 the table and  table were changed to allow some articles in the history table to be compressed. Old entries marked with  have their old_text compressed with zlib's deflate algorithm, with no header bytes. PHP's  will accept this text plainly; in Perl etc set the window size to   to disable the header bytes.

История страниц
It is also possible to compress the history table in a way which exploits the similar data in the different versions, such as Reverse diff version control. See History compression for some actual numbers.

Сжатие кэша
File cache talks about compression in the cached copies of pages. Now that the Wikimedia projects use squids, it's unclear how much of this is obsolete.