-MediaWiki has optional support for memcached, a "high-performance,
-distributed memory object caching system". For general information
+MediaWiki has optional support for memcached, a "high-performance,
+distributed memory object caching system". For general information
on it, see: http://www.danga.com/memcached/
Memcached is likely more trouble than a small site will need, but
== Installation ==
Packages are available for Fedora, Debian, Ubuntu and probably other
-Linux distributions. If you there's no package available for your
+Linux distributions. If there's no package available for your
distribution, you can compile it from source.
== Compilation ==
* memcached: http://www.danga.com/memcached/download.bml
(as of this writing, 1.1.9 is current)
-
+
Memcached and libevent are under BSD-style licenses.
The server should run on Linux and other Unix-like systems... you
the internet can put data into and read data from your cache.
An attacker familiar with MediaWiki internals could use this to steal
-passwords and email addresses, or to make themselves a sysop and
-install malicious javascript on the site. There may be other types
-of vulnerability, no audit has been done -- so be safe and keep it
+passwords and email addresses, or to make themselves a sysop and
+install malicious javascript on the site. There may be other types
+of vulnerability, no audit has been done -- so be safe and keep it
behind a firewall.
********************* W A R N I N G ! ! ! ! ! ***********************
memcached -d -l 127.0.0.1 -p 11211 -m 64
(to run in daemon mode, accessible only via loopback interface,
-on port 11000, using up to 64MB of memory)
+on port 11211, using up to 64MB of memory)
In your LocalSettings.php file, set:
usage evenly), make its entry a subarray:
$wgMemCachedServers = array(
- "127.0.0.1:11000", # one gig on this box
- array("192.168.0.1:11000", 2 ) # two gigs on the other box
+ "127.0.0.1:11211", # one gig on this box
+ array("192.168.0.1:11211", 2 ) # two gigs on the other box
);
== PHP client for memcached ==
MediaWiki uses a fork of Ryan T. Dean's pure-PHP memcached client.
-The newer PECL module is not yet supported.
+It also supports the PECL PHP extension for memcached.
MediaWiki uses three object for object caching:
* $wgMemc, controlled by $wgMainCacheType
disable itself fairly smoothly.
By default, $wgMemc is used but when it is $parserMemc or $messageMemc
-this is mentionned below.
+this is mentioned below.
== Keys used ==
key: $wgDBname:messages, $wgDBname:messages-hash, $wgDBname:messages-status
ex: wikidb:messages, wikidb:messages-hash, wikidb:messages-status
stores: an array where the keys are DB keys and the values are messages
- set in: wfMsg(), Article::editUpdates() both call wfLoadAllMessages()
+ set in: wfMessage(), Article::editUpdates() and Title::moveTo()
expriy: $wgMsgCacheExpiry
cleared by: nothing
Parser Cache:
stored in: $parserMemc
controlled by: $wgEnableParserCache
- key: $wgDBname:pcache:idhash:$pageid-$renderkey!$hash$edit
+ key: $wgDBname:pcache:idhash:$pageid-$renderkey!$hash
$pageid: id of the page
$renderkey: 1 if action=render, 0 otherwise
- $hash: hash of user options, see User::getPageRenderingHash()
- $edit: '!edit=0' if the user can't edit the page, '' otherwise
+ $hash: hash of user options applied to the page, see ParserOptions::optionsHash()
ex: wikidb:pcache:idhash:1-0!1!0!!en!2
stores: ParserOutput object
- modified by: Article::editUpdates()
- expriy: $wgParserCacheExpireTime or one hour if it contains specific magic
- words
+ modified by: WikiPage::doEditUpdates() or PoolWorkArticleView::doWork()
+ expiry: $wgParserCacheExpireTime or less if it contains short lived functions
+
+ key: $wgDBname:pcache:idoptions:$pageid
+ stores: CacheTime object with an additional list of used options for the hash,
+ serves as ParserCache pointer.
+ modified by: ParserCache::save()
+ expiry: The same as the ParserCache entry it points to.
Ping limiter:
controlled by: $wgRateLimits
expriry: $wgRevisionCacheExpiry
Sessions:
- controlled by: $wgSessionsInMemcached
+ controlled by: $wgSessionsInObjectCache
key: $wgBDname:session:$id
ex: wikidb:session:38d7c5b8d3bfc51egf40c69bc40f8be3
stores: $SESSION, useful when using a multi-sever wiki
Special:Recentchanges (feed):
stored in: $messageMemc
- key: $wgDBname:rcfeed:$format:limit:$imit:minor:$hideminor and
+ key: $wgDBname:rcfeed:$format:$limit:$hideminor:$target and
rcfeed:$format:timestamp
- ex: wikidb:rcfeed:rss:limit:50:minor:0 and rcfeed:rss:timestamp
+ ex: wikidb:rcfeed:rss:50:: and rcfeed:rss:timestamp
stores: xml output of feed
expiry: one day
- clear by: calling Special:Recentchanges?action=purge
+ clear by: maintenance/rebuildrecentchanges.php script, or
+ calling Special:Recentchanges?action=purge&feed=rss,
+ Special:Recentchanges?action=purge&feed=atom,
+ but note need $wgGroupPermissions[...]['purge'] permission.
Statistics:
controlled by: $wgStatsMethod
key: $wgDBname:stats:$key
ex: wikibd:stats:request_with_session
- stores: counter for statistics (see maintenance/stats.php script)
+ stores: counter for statistics (see maintenance/showCacheStats.php script)
expiry: none (?)
- cleared by: maintenance/clear_stats.php script
+ cleared by: maintenance/clearCacheStats.php script
User:
key: $wgDBname:user:id:$sId
stores: instance of class User
set in: User::saveToCache()
cleared by: User::saveSettings(), User::clearSharedCache()
-
+
... more to come ...
dépôts / lhc / web / wiklou.git / blobdiff