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===Jboss===
Basic jboss tuning http://wiki.jboss.org/wiki/JBossASTuningSliming

==Sub Topics==
[[JbossScheduler Scheduling tasks]]

====Garbage Collection====
Useful options:
%%
-verbose:gc -Xloggc:<filename> -XX:ParallelGCThreads=n (where n should not exceed number of cpus)
%%

====Heap tuning====
Useful options:
%%
-Xms : minimum heap size
-Xmx : max heap size
-XX:MaxNewSize= : max young generation size
-XX:NewRatio : ratio of young to tenured generation
-XX:UseTLAB : provide each thread in application with its own allocation area in the eden space
-XX:MaxPermSize : max perm generation size
%%


===Jboss rewrite===
http://www.jboss.org/file-access/default/members/jbossweb/freezone/docs/2.1.0/rewrite.html

- edit server.xml under jboss-web.deployer/
- add  <Valve className="org.jboss.web.rewrite.RewriteValve" /> to the <Host> section
- then create rewrite.properties under $JB_HOME/server/default/conf/
- the file should look like 

%%
RewriteRule ^/abc /cde
%%

===CLOSE_WAIT bug===
bug - https://jira.jboss.org/jira/browse/JBPAPP-366
install - http://www.jboss.org/community/docs/DOC-9912

==Clustering==
要在JBOSS中配置JVM路由( JVMRoute)，否則APACHE就� 法知道究竟哪些SESSION是属于哪个节点的。
1)修改jboss-service.xml配置文件%jboss%\server\all\deploy\jbossweb-tomcat55.sar\ META-INF\ jboss-service.xml將<attribute name="UseJK">false</attribute>，将false值改为true。

2)修改server.xml配置文件
修改server1上的%jboss%\server\all\deploy\jbossweb-tomcat55.sar\ server.xml
<Engine name="jboss.web" defaultHost="localhost">
给它增� 一个jvmRoute属性：
<Engine jvmRoute="server1" name="jboss.web" defaultHost="localhost">
请注意，jvmRoute的值必须和mod_jk中的节点名字一致，

3）WEB程序的配置
需要在� 的Web应用中修改配置文件，让它支持集群。在WEB-INF\web.xml中� 入属性： <distributable/>