Changes for page Performance

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...	...	@@ -7,6 +7,84 @@
7	7
8	8	Here are some tips to increase XWiki's performances.
9	9
	10	+1.1 Gzip compression and caching of static pages
	11	+
	12	+We're working on making these features part of the XWiki core (see [XWIKI-2022>http://jira.xwiki.org/jira/browse/XWIKI-2022]). While waiting for this to be natively implemented, the recommended solution is to set up an Apache Web Server in front of your servlet container and install/configure the following modules:
	13	+* [mod-deflate>http://httpd.apache.org/docs/2.0/mod/mod_deflate.html]
	14	+* [mod-expire>http://httpd.apache.org/docs/2.0/mod/mod_expires.html]
	15	+* [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)
	16	+
	17	+Modify your Apache configuration file to load the different modules:
	18	+
	19	+{code:none}
	20	+LoadModule expires_module /usr/lib/apache2/modules/mod_expires.so
	21	+LoadModule deflate_module /usr/lib/apache2/modules/mod_deflate.so
	22	+LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
	23	+# Depends: proxy
	24	+LoadModule proxy_ajp_module /usr/lib/apache2/modules/mod_proxy_ajp.so
	25	+{code}
	26	+
	27	+And configure your different modules as described below.
	28	+
	29	+1.1.1 Mod Deflate Configuration
	30	+
	31	+{code:none}
	32	+vwwwpro-1:~# cat /etc/apache2/conf.d/deflate
	33	+<Location />
	34	+ # Insert filter
	35	+ SetOutputFilter DEFLATE
	36	+
	37	+ # Netscape 4.x has some problems...
	38	+ BrowserMatch ^Mozilla/4 gzip-only-text/html
	39	+
	40	+ # Netscape 4.06-4.08 have some more problems
	41	+ BrowserMatch ^Mozilla/4\.0[678] no-gzip
	42	+
	43	+ # MSIE masquerades as Netscape, but it is fine
	44	+ # BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
	45	+
	46	+ # NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
	47	+ # the above regex won't work. You can use the following
	48	+ # workaround to get the desired effect:
	49	+ BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
	50	+
	51	+ # Don't compress images
	52	+ SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
	53	+
	54	+ # Make sure proxies don't deliver the wrong content
	55	+ #Header append Vary User-Agent env=!dont-vary
	56	+</Location>
	57	+{code}
	58	+
	59	+1.1.1 Mod Expire Configuration
	60	+
	61	+{code:none}
	62	+vwwwpro-1:~# cat /etc/apache2/conf.d/expires
	63	+<Location /xwiki/skins/>
	64	+ ExpiresActive on
	65	+ ExpiresDefault "access plus 1 day"
	66	+</Location>
	67	+
	68	+<Location /xwiki/bin/skin/>
	69	+ ExpiresActive on
	70	+ ExpiresDefault "access plus 1 day"
	71	+</Location>
	72	+{code}
	73	+
	74	+1.1.1 Mod Proxy AJP Configuration
	75	+
	76	+{code:none}
	77	+ ProxyRequests Off
	78	+ <Proxy *>
	79	+ Order deny,allow
	80	+ Allow from all
	81	+ </Proxy>
	82	+ ProxyPreserveHost On
	83	+ ProxyPass /xwiki ajp://192.168.1.181:8009/xwiki
	84	+{code}
	85	+
	86	+where <tt>ajp://192.168.1.181:8009/xwiki</tt> is the internal address of your Servlet container where XWiki is running.
	87	+
10	10	1.1 Memory
11	11
12	12	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. A good default value is 384MB (-Xmx384m).