Wiki source code of Performance

Version 101.2 by Vincent Massol on 2018/07/03

version	line-number	content
22.1	1	{{box cssClass="floatinginfobox" title="Contents"}}
	2	{{toc/}}
	3	{{/box}}
20.1	4
17.1	5	Here are some tips to increase XWiki's performance.
10.1	6
49.1	7	= Clustering =
	8
89.1	9	If you need high availability or if the load on your XWiki instance is too high you can [[configure XWiki in a cluster>>Documentation.AdminGuide.Clustering.WebHome]] to spread the load.
49.1	10
48.1	11	= Standalone Solr =
	12
66.1	13	By default XWiki use an embedded instance of Solr for easy of use but if you find yourself struggling with very slow search you should probably give external Solr instance a try. You can use ##debug=true## in the URL of the search to check how long is taken in Solr itself to know if improving Solr speeed would really change anything (the issue might come from the UI on XWiki side too).
50.1	14
65.1	15	See [[Performance Guide in Solr module documentation>>extensions:Extension.Solr Search API#HPerformances]].
64.1	16
42.1	17	= Slow random number generation on UNIX =
	18
67.1	19	The library used for random number generation in Oracle's JVM relies on ##/dev/random## by default for UNIX platforms.
42.1	20
48.3	21	Although ##/dev/random## is more secure, it's possible to use ##/dev/urandom## if the default JVM configuration instead.
42.1	22
	23	To determine if your operating system exhibits this behavior, try displaying a portion of the file from a shell prompt:
	24
45.1	25	{{code language="bash"}}
42.1	26	head -n 1 /dev/random
45.1	27	{{/code}}
42.1	28
79.1	29	If the command returns immediately, you can use ##/dev/random## as the default generator for Oracle's JVM. If the command does not return immediately, use on of the following solutions to use ##/dev/urandom##:
42.1	30
79.1	31	== JVM setup ==
	32
44.1	33	1. Open the ##$JAVA_HOME/jre/lib/security/java.security## file in a text editor.
	34	1. Change the line:
50.1	35	{{code language="properties"}} securerandom.source=file:/dev/random{{/code}}
42.1	36	to read:
50.1	37	{{code language="properties"}} securerandom.source=file:/dev/urandom{{/code}}
44.1	38	1. Save your change and exit the text editor.
42.1	39
79.1	40	== Command line parameter ==
	41
	42	The same effect can be obtained using ##-Djava.security.egd=file:/dev/urandom## in the Java command line (usually in the application server configuration).
	43
20.2	44	= Gzip compression and caching of static pages =
14.1	45
92.1	46	HTTP compression is a capability that can be built into web servers and web clients to improve transfer speed and bandwidth utilization. HTTP data is compressed before it is sent from the server: compliant browsers will announce what methods are supported to the server before downloading the correct format; browsers that do not support compliant compression method will download uncompressed data.
14.1	47
94.1	48	Many application servers (Tomcat, etc.) and HTTP proxies (Apache HTTPd, Nginx, etc.) support it.
92.1	49
93.1	50	== In Apache HTTP Server ==
92.1	51
	52	The recommended solution is to set up an Apache Web Server in front of your servlet container and install/configure the following modules:
	53
20.1	54	* [[mod-deflate>>http://httpd.apache.org/docs/2.0/mod/mod_deflate.html]]
81.1	55	* [[mod-expires>>http://httpd.apache.org/docs/2.0/mod/mod_expires.html]]
20.1	56	* [[mod-proxy-ajp>>http://httpd.apache.org/docs/2.2/mod/mod_proxy_ajp.html]] (note that this depends on [[mod-proxy>>http://httpd.apache.org/docs/2.2/mod/mod_proxy.html]] that you also need to install)
	57
14.1	58	Modify your Apache configuration file to load the different modules:
	59
20.1	60	{{code language="none"}}
14.1	61	LoadModule expires_module /usr/lib/apache2/modules/mod_expires.so
	62	LoadModule deflate_module /usr/lib/apache2/modules/mod_deflate.so
	63	LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
	64	# Depends: proxy
	65	LoadModule proxy_ajp_module /usr/lib/apache2/modules/mod_proxy_ajp.so
20.1	66	{{/code}}
14.1	67
37.1	68	//Alternatively you can run the following commands as root (sudo)//
	69
	70	{{code language="bash"}}
	71	a2enmod deflate
	72	a2enmod proxy_ajp
	73	a2enmod expires
	74	{{/code}}
	75
32.2	76	and configure your different modules as described below:
14.1	77
92.1	78	=== Mod Deflate Configuration ===
14.1	79
20.1	80	{{code language="none"}}
14.1	81	vwwwpro-1:~# cat /etc/apache2/conf.d/deflate
	82	<Location />
	83	# Insert filter
	84	SetOutputFilter DEFLATE
	85
	86	# Netscape 4.x has some problems...
	87	BrowserMatch ^Mozilla/4 gzip-only-text/html
	88
	89	# Netscape 4.06-4.08 have some more problems
20.1	90	BrowserMatch ^Mozilla/4.0[678] no-gzip
14.1	91
	92	# MSIE masquerades as Netscape, but it is fine
20.1	93	# BrowserMatch bMSIE !no-gzip !gzip-only-text/html
14.1	94
	95	# NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
	96	# the above regex won't work. You can use the following
	97	# workaround to get the desired effect:
20.1	98	BrowserMatch bMSI[E] !no-gzip !gzip-only-text/html
14.1	99
	100	# Don't compress images
20.1	101	SetEnvIfNoCase Request_URI .(?:gif\|jpe?g\|png)$ no-gzip dont-vary
14.1	102
	103	# Make sure proxies don't deliver the wrong content
	104	#Header append Vary User-Agent env=!dont-vary
	105	</Location>
20.1	106	{{/code}}
14.1	107
37.1	108	//On debian apache2 the config file for deflate is located under /etc/apache2/mods-enabled/deflate.conf//
	109
92.1	110	=== Mod Expire Configuration ===
14.1	111
20.1	112	{{code language="none"}}
14.1	113	vwwwpro-1:~# cat /etc/apache2/conf.d/expires
	114	<Location /xwiki/skins/>
	115	ExpiresActive on
	116	ExpiresDefault "access plus 1 day"
	117	</Location>
	118
	119	<Location /xwiki/bin/skin/>
	120	ExpiresActive on
	121	ExpiresDefault "access plus 1 day"
	122	</Location>
20.1	123	{{/code}}
14.1	124
92.1	125	=== Mod Proxy AJP Configuration ===
14.1	126
20.1	127	{{code language="none"}}
	128	ProxyRequests Off
14.1	129	<Proxy *>
	130	Order deny,allow
	131	Allow from all
	132	</Proxy>
	133	ProxyPreserveHost On
	134	ProxyPass /xwiki ajp://192.168.1.181:8009/xwiki
20.1	135	{{/code}}
14.1	136
20.1	137	where ##ajp:~/~/192.168.1.181:8009/xwiki## is the internal address of your Servlet container where XWiki is running.
14.1	138
37.1	139	If you use Tomcat(7) you need to enable the ajp connector in the /etc/tomcat7/server.xml. Comment out the following line with adding {{code}}<!-- -->{{/code}}. //Maybe give a comment why you did it.//
	140
	141	{{code}}
	142	<!-- disable to use ajp connector instead
	143	<Connector port="8080" protocol="HTTP/1.1"
	144	connectionTimeout="20000"
	145	URIEncoding="UTF-8"
	146	redirectPort="8443" />
	147	-->
	148	{{/code}}
	149
39.1	150	Uncomment the following line by removing the {{code}}<!-- -->{{/code}} and add {{code}}URIEncoding="UTF-8"{{/code}} to it.Maybe give a comment too.
37.1	151
	152	{{code}}
	153	<!-- Activate ajp connector for apache proxy_ajp -->
	154	<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" URIEncoding="UTF-8"/>
	155	{{/code}}
	156
20.2	157	= Memory =
9.1	158
34.1	159	You need to configure your Servlet container so that XWiki has enough memory. You'll need to tune the value to your need. You should check the logs and see if there are any "out of memory" errors. Here are some good default values:
36.1	160
78.1	161	* For Java 8 (i.e. XWiki >= 8.1). Notice that there's no permgen anymore in Java 8:
96.1	162	** Small and medium installs: A minimum of 1024MB (##-Xmx1024m)##
	163	** Large installs: 2048MB or beyond (##-Xmx2048m).##
78.1	164	* For Java 7 (i.e. XWiki < 8.1)
	165	** Small installs: A minimum of 512MB of heap memory and 196MB of permGen (##-Xmx512m -XX:MaxPermSize=196m##)
	166	** Medium installs: 1024MB for the heap and 196MB of permGen (##-Xmx1024m -XX:MaxPermSize=196m##)
	167	** Large installs: 2048MB (or beyond) for the heap and 196MB of permGen (##-Xmx2048m -XX:MaxPermSize=196m##).
9.1	168
53.3	169	{{info}}
53.1	170	You should not increase the memory beyond what you need because increasing it means that there's more Objects in memory at any time and the automatic JVM Garbage Collector has to work harder to clean itself, which can results in performance degradation in XWiki (since a full GC will pause the application for a longer time).
53.3	171	{{/info}}
53.1	172
34.1	173	{{warning}}
88.4	174	Note that storing attachments with the default (in database) storage mechanism is very memory intensive. See the [[administrators guide to attachments>>Documentation.AdminGuide.Attachments]] for more information about memory cost and the alternative filesystem based attachment store.
38.2	175
82.1	176	Also note that uploading a lot of pages can trigger out of memory (OOM) errors due to scheduled watchlist jobs. For example uploading 1 million pages will trigger OOM errors even when the JVM is configured to run with 2GB of heap space. For such kind of load we recommend to disable (unschedule) the Watchlist jobs (in ##/xwiki/bin/view/Scheduler/##) before uploading the pages. To track the progress on this issue, please see [[XWIKI-10594>>https://jira.xwiki.org/browse/XWIKI-10594]].
34.1	177	{{/warning}}
20.1	178
76.1	179	{{warning}}
88.5	180	If you use HSQLDB as the wiki database, be aware that the full content of the database is stored in memory and thus the memory requirements are higher. See [[HSQLDB installation page>>Documentation.AdminGuide.Installation.InstallationWAR.InstallationHSQL.WebHome]] for more details.
76.1	181	{{/warning}}
	182
35.1	183	For your information here are the values used for the xwiki.org site:
	184
	185	{{code}}
96.3	186	CATALINA_OPTS="-server -Xms800m -Xmx1600m -XX:MaxPermSize=222m -Dfile.encoding=utf-8 -Djava.awt.headless=true -XX:+UseParallelGC -XX:MaxGCPauseMillis=100"
35.1	187	{{/code}}
	188
20.2	189	= Database Indexes =
1.1	190
90.1	191	Make sure you've set [[Database indexes>>Documentation.AdminGuide.Performances.Database Administration.WebHome]]. This is especially important when you start having lots of documents.
1.1	192
74.1	193	= Large number of users =
	194
	195	When you have large number of users it's recommended to turn on implicit All Group, i.e. to consider that all users are members of XWiki.XWikiAllGroup by default in the configuration. This is achieved by editing the ##xwiki.cfg## file and setting:
	196
	197	{{code language="none"}}
	198	xwiki.authentication.group.allgroupimplicit=1
	199	{{/code}}
	200
75.1	201	Then you should remove all the XObjects from the XWikiAllGroup page but you should keep the page since otherwise you won't be able to set permissions for this group. This will prevent XWiki from having to load all that page's XObjects representing the users (thousands of them if you have thousands of users).
74.1	202
75.2	203	Also make sure that the ##XWikiAllGroup## is listed in the ##xwiki.users.initialGroups## property (it's there by default if you haven't touched that property):
	204
	205	{{code language="none"}}
	206	#-# List of groups that a new user should be added to by default after registering. Comma-separated list of group
	207	#-# document names.
	208	# xwiki.users.initialGroups=XWiki.XWikiAllGroup
	209	{{/code}}
	210
20.2	211	= Robots.txt =
15.1	212
86.6	213	If your wiki is open on the Internet, it'll be crawled by search robots (like GoogleBot, etc). They will call all the URLs and especially the ones that are resource hungry like exports (PDF/RTF). You need to protect against this. To do so configure a ##robots.txt## file and put it in your webserver configuration.
15.1	214
85.1	215	Some example:
	216
20.1	217	{{code language="none"}}
15.1	218	User-agent: *
86.7	219	# Prevent bots from executing all actions except "view" since:
86.1	220	# 1) we don't want bots to execute stuff in the wiki!
86.2	221	# 2) we don't want bots to consume CPU and memory
86.7	222	# (for example to perform exports)
	223	# Note: You may want to allow /download/ if you wish to have
	224	# attachments indexed.
86.4	225	Disallow: /xwiki/bin/viewattachrev/
	226	Disallow: /xwiki/bin/viewrev/
86.1	227	Disallow: /xwiki/bin/pdf/
86.4	228	Disallow: /xwiki/bin/tex/
86.1	229	Disallow: /xwiki/bin/edit/
86.4	230	Disallow: /xwiki/bin/create/
86.1	231	Disallow: /xwiki/bin/inline/
	232	Disallow: /xwiki/bin/preview/
	233	Disallow: /xwiki/bin/save/
86.4	234	Disallow: /xwiki/bin/saveandcontinue/
	235	Disallow: /xwiki/bin/rollback/
	236	Disallow: /xwiki/bin/deleteversions/
86.1	237	Disallow: /xwiki/bin/cancel/
	238	Disallow: /xwiki/bin/delete/
86.4	239	Disallow: /xwiki/bin/deletespace/
	240	Disallow: /xwiki/bin/undelete/
	241	Disallow: /xwiki/bin/reset/
86.1	242	Disallow: /xwiki/bin/register/
	243	Disallow: /xwiki/bin/propupdate/
	244	Disallow: /xwiki/bin/propadd/
86.4	245	Disallow: /xwiki/bin/propdisable/
	246	Disallow: /xwiki/bin/propenable/
86.1	247	Disallow: /xwiki/bin/propdelete/
86.4	248	Disallow: /xwiki/bin/objectadd/
86.1	249	Disallow: /xwiki/bin/commentadd/
86.4	250	Disallow: /xwiki/bin/commentsave/
	251	Disallow: /xwiki/bin/objectsync/
86.1	252	Disallow: /xwiki/bin/objectremove/
	253	Disallow: /xwiki/bin/attach/
	254	Disallow: /xwiki/bin/upload/
	255	Disallow: /xwiki/bin/download/
86.4	256	Disallow: /xwiki/bin/temp/
	257	Disallow: /xwiki/bin/downloadrev/
86.1	258	Disallow: /xwiki/bin/dot/
86.4	259	Disallow: /xwiki/bin/svg/
86.1	260	Disallow: /xwiki/bin/delattachment/
	261	Disallow: /xwiki/bin/skin/
86.4	262	Disallow: /xwiki/bin/jsx/
	263	Disallow: /xwiki/bin/ssx/
86.1	264	Disallow: /xwiki/bin/login/
86.4	265	Disallow: /xwiki/bin/loginsubmit/
86.1	266	Disallow: /xwiki/bin/loginerror/
	267	Disallow: /xwiki/bin/logout/
86.4	268	Disallow: /xwiki/bin/charting/
	269	Disallow: /xwiki/bin/lock/
	270	Disallow: /xwiki/bin/redirect/
	271	Disallow: /xwiki/bin/admin/
22.1	272	Disallow: /xwiki/bin/export/
86.4	273	Disallow: /xwiki/bin/import/
86.2	274	Disallow: /xwiki/bin/get/
86.4	275	Disallow: /xwiki/bin/distribution/
	276	Disallow: /xwiki/bin/imagecaptcha/
	277	Disallow: /xwiki/bin/unknown/
86.5	278	Disallow: /xwiki/bin/webjars/
86.2	279	# Don't index sandbox content since it's sample content
86.1	280	Disallow: /xwiki/bin/view/Sandbox/
86.2	281	# Don't index Admin space since it contains Admin stuff.
	282	# Note that the Admin space is protected by permissions
	283	# anyway but this acts as a safety net to not have private
	284	# info leaked on the internet ;)
86.1	285	Disallow: /xwiki/bin/view/Admin/
86.2	286	# Don't index Stats data (just because it's not useful and
	287	# those pages are a bit CPU intensive)
86.1	288	Disallow: /xwiki/bin/view/Stats/
86.2	289	# Don't index Panels data (because we don't want it
	290	# indexed on the internet)
86.1	291	Disallow: /xwiki/bin/view/Panels/
	292	{{/code}}
	293
	294	Other example:
	295
	296	{{code}}
	297	[...]
85.1	298	# It could be also useful to block certain spaces from crawling,
22.1	299	# especially if this spaces doesn't provide new content
	300	Disallow: /xwiki/bin/view/Main/
	301	Disallow: /xwiki/bin/view/XWiki/
85.1	302	# On the other hand you would like to have your recent (public) changes included
22.1	303	Allow: /xwiki/bin/view/Main/Dashboard
20.1	304	{{/code}}
15.1	305
32.2	306	Note:
32.1	307
32.2	308	For Tomcat6 the placement of the ##robots.txt## file should be within the //$TOMCAT/webapps/ROOT// folder and should have permission 644 applied.
32.1	309
	310	{{code}}
	311	-rw-r--r-- 1 root www 1478 Jan 8 15:52 robots.txt
	312	{{/code}}
	313
32.2	314	In order to test if the ##robots.txt## file is either accessable or working as desired use this [[checker>>http://www.frobee.com/robots-txt-check]].
32.1	315
20.2	316	= Statistics =
1.1	317
20.1	318	{{info}}
	319	This is no longer true starting with XE 1.4M2 since statistics are now put on a queue and written in a different thread in the database in one go, thus reducing the overhead to a maximum.
	320	{{/info}}
15.1	321
32.2	322	The statistics module is off by default since it's quite database intensive. If you don't need it you should turn it off.
1.2	323
52.3	324	= Document Cache =
1.2	325
52.3	326	You can tune the Document cache in the ##xwiki.cfg## configuration file. The value depends on how much memory you have. The higher the better. A good reasonable value is 1000.
2.1	327
20.1	328	{{code language="none"}}
19.1	329	xwiki.store.cache.capacity=1000
20.1	330	{{/code}}
8.1	331
25.1	332	= Cache Macro =
	333
26.1	334	It's possible to perform selective content caching by using the [[Cache Macro>>extensions:Extension.Cache Macro]].
25.1	335
77.1	336	= LESS CSS Performances =
51.1	337
77.1	338	[[LESS>>extensions:Extension.LESS Module]] is a preprocessor used to generate CSS files for skins and skin extensions. See the [[Performances section>>extensions:Extension.LESS Module#HPerformances]] of the LESS module documentation to learn more about how to optimize its cache for performances, and to set the appropriate number of simultaneous compilations your server can handle.
51.1	339
20.2	340	= Rendering cache =
2.1	341
30.1	342	Some pages are complex to render (they may aggregate outside data for example or do complex and slow queries). For theses pages you can use rendering cache.
	343
29.1	344	== Configuration based ==
25.1	345
32.2	346	Pages can be cached (i.e. their rendered content cached) to speed up displaying. The configuration is done in ##xwiki.properties## with the following configuration options:
25.1	347
	348	{{code language="none"}}
	349	#-# [Since 2.4M1]
	350	#-# Indicate if the rendering cache is enabled.
	351	#-# Default value is false.
	352	# core.renderingcache.enabled=true
	353
	354	#-# [Since 2.4M1]
	355	#-# A list of Java regex patterns matching full documents reference.
	356	# core.renderingcache.documents=wiki:Space\.Page
	357	# core.renderingcache.documents=wiki:Space\..*
	358
	359	#-# [Since 2.4M1]
	360	#-# The time (in seconds) after which data should be removed from the cache when not used.
	361	#-# Default value is 300 (5 min).
	362	# core.renderingcache.duration=300
	363
	364	#-# [Since 2.4M1]
	365	#-# The size of the rendering cache. Not that it's not the number of cached documents but the number of cached results.
	366	#-# (For a single document several cache entries are created, because each action, language and request query string
	367	#-# produces a unique rendering result)
	368	#-# Default value is 100.
	369	# core.renderingcache.size=100
	370	{{/code}}
	371
31.1	372	You can force a page to refresh using ##refresh=1## in the URL.
30.1	373
41.1	374	Since 6.2 it's also possible to programmatically refresh any document cache using ##com.xpn.xwiki.internal.cache.rendering.RenderingCache## component:
39.1	375
	376	{{code language="java"}}
	377	@Inject
	378	private RenderingCache renderingCache;
	379
	380	...
	381
	382	renderingCache.flushWholeCache();
	383	renderingCache.flushCache(new DocumentReference("xwiki", "MySpace", "MyCachedDocument"));
	384	{{/code}}
	385
25.1	386
20.2	387	= Merge the CSS files =
11.1	388
32.2	389	In order to reduce the number of requests and files that are downloaded from the browser or client, it could help to merge all XWiki CSS files into a single one. See the [[Merge CSS Script>>extensions:Extension.Merge CSS]].
11.1	390
20.2	391	= Set up NginX =
19.2	392
32.2	393	If you experience //__heavy loads__// on your wiki, you could try using NginX.
19.3	394
36.1	395	NginX is used to fetch static content: images, javascript, styles, etc, but it can also be used as a reverse-proxy to pass requests down to the web container (e.g. Tomcat on port 8080).
19.2	396
32.2	397	Unlike Apache, which instantiates a new process per every static file, NginX uses the same process to fetch all the static data, and thus gives you extra perfomance "for free".
19.2	398
91.1	399	For more info on setting up NginX check [[this guide>>Documentation.AdminGuide.Installation.NginX.WebHome]].
19.2	400
20.2	401	= Backlinks =
4.1	402
20.1	403	While a pretty neat feature, keeping track of the backlinks has a medium impact on the document saving time and a minor impact on the document loading time. If you feel that your wiki does not need backlinks, you can safely disable them with the following line in ##xwiki.cfg##:
	404
	405	{{code language="none"}}
19.1	406	xwiki.backlinks=0
20.1	407	{{/code}}
5.1	408
20.2	409	= Versioning =
5.1	410
32.2	411	One of the key features of any wiki system, versioning greatly affects the database size and the document update time. If you are sure your wiki does not need to keep track of all the changes and you will never need to revert documents to a previous version, then you can add the following line in ##xwiki.cfg##:
20.1	412
	413	{{code language="none"}}
19.1	414	xwiki.store.versioning=0
20.1	415	{{/code}}
6.1	416
21.1	417	= Custom Mapping =
6.1	418
32.2	419	In some cases you may not want to rely on XWiki's generic database schema for storing XClass data and instead you'd like to provide your own optimized table. For these use cases you can use [[Custom Mapping>>platform:DevGuide.CustomMapping]].
21.1	420
73.1	421	= LDAP =
	422
	423	== Disable LDAP sub groups search ==
	424
	425	By default when loading a LDAP group, each member is searched and loaded to figure out if it's a group or not (and then load the sub group members, etc). Since 7.2 If you know there is not sub group in your LDAP groups you can disable it and speed up quite a lot big groups handling using ##xwiki.authentication.ldap.group_sync_resolve_subgroups## property in ##xwiki.cfg## configuration file.
	426
56.1	427	= Performance tree =
	428
57.1	429	Since 7.1 it's possible to directly get a tree of time spent in each step of the request by using [[debug mode>>dev:Community.Debugging#HDebugmode]].
68.1	430
98.2	431	= Navigation Tree =
98.1	432
	433	The Navigation Panel and other navigation trees can have some small performance issues under very high volumes. Here ares some base measures we did on some developer laptops to give you some ideas of the performance you should expect:
	434
	435	Measure set 1:
	436
101.1	437	(% width="100%" class="table-bordered" %)
101.2	438	\|=(% width="20%" %)DB\|=(% width="10%" %)Levels\|=(% width="10%" %)Spaces\|=(% width="10%" %)Pages\|=(% width="15%" %)Requests\|=Time
100.1	439	\|MySQL\|5\|6887\|4049\|31\|180ms
	440	\|HSQLDB\|5\|6762\|4063\|27\|138ms
	441	\|MySQL\|1\|2514\|4962\|27\|331ms
	442	\|HSQLDB\|1\|2377\|4718\|21\|3.15s
98.1	443
	444	Measure set 2:
	445
101.1	446	(% width="100%" class="table-bordered" %)
101.2	447	\|=(% width="20%" %)DB\|=(% width="10%" %)Levels\|=(% width="10%" %)Spaces\|=(% width="10%" %)Pages\|=(% width="15%" %)Requests\|=Time
100.1	448	\|Oracle\|5\|6943\|4106\|20\|119ms
	449	\|Oracle\|1\|2493\|4982\|20\|153ms
98.1	450
	451	Measure set 3:
	452
101.1	453	(% width="100%" class="table-bordered" %)
101.2	454	\|=(% width="20%" %)DB\|=(% width="10%" %)Levels\|=(% width="10%" %)Spaces\|=(% width="10%" %)Pages\|=(% width="15%" %)Requests\|=Time
101.1	455	\|Oracle\|1\|2485\|4991\|20\|151ms
	456	\|PostgreSQL\|1\|2494\|4991\|20\|125ms
98.1	457
68.1	458	= Legacy =
	459
71.1	460	== Monitor plugin ==
70.1	461
	462	More a developer-oriented feature, XWiki can monitor its own code, reporting the time spent for each sub-component activated during a request. While the monitoring code isn't time consuming, it increases the memory consumption a bit, and the create/start/stop/log/destroy calls are spread all around the code, so you will save a lot of method calls by disabling this. You can do that by setting the following line in ##xwiki.cfg##:
	463
	464	{{code language="properties"}}
	465	xwiki.monitor=0
	466	{{/code}}
	467
68.1	468	== 1.0 rendering cache using velocity in document content itself ==
	469
	470	You can add the following to their content to cache them after they are rendered. Note that the document is refreshed whenever the content of the document changes, and the cache takes into account the URL, so it is pretty safe to add a long cache duration for all documents that don't contain scripts gathering data from the wiki. For example to cache the rendered content for 60 seconds you would add:
	471
	472	{{code language="none"}}
	473	$context.setCacheDuration(60)
	474	{{/code}}
	475
	476	Since 1.5M2, you can set the default rendering cache duration for all pages in ##xwiki.cfg##:
	477
	478	{{code language="none"}}
	479	## cache all rendered documents for one hour
	480	xwiki.rendering.defaultCacheDuration=3600
	481	{{/code}}
	482
	483	Setting the default cache duration to a large value, and manually disabling the cache in dynamic pages would really speed up the wiki, since the rendering is one of the most time consuming processes.
69.1	484
72.1	485	== Wiki syntax features for XWiki Syntax 1.0 ==
69.1	486
	487	If you're using XWiki Syntax 1.0 and if you don't plan to use all of the markup features, like the strikethrough filter, the automatic http links filter, the SVG, Laszlo or style macros, you can disable them in ##xwiki-core-.jar/META-INF/services/com.xpn.xwiki.render.##. The wiki rendering is the most costly operation in the rendering process, so any disabled feature counts.
	488
	489	Now this will have no effect if you're using another syntax, like XWiki Syntax 2.x.

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