Can somebody explain parameters in run.conf of JBoss AS

In run.conf of JBoss AS there are few parameters which I am unable to figure o开发者_如何学运维ut how they are used MAX_FD, PROFILER, JAVA_HOME, JAVA. Can somebody explain the use of these parameters. I agree I am new to JBoss and these are preliminary questions.

From this wiki entry

• JAVA_HOME : The location of the JDK (java development kit)
• JAVA_OPTS : Options passed the java command, e.g. -Xmx512M
• JAVA : The name of the java binary (default java)
• JBOSS_CLASSPATH : additional classpath entries, if this is set, its value will be prepended to the classpath at startup
• MAX_FD : The maximum number of file descriptors used by JBoss (Unix only)

Actually Xms is for defining minimum memory size that is to be allocated for the deployed jboss Appplication and Xmx is maximum memory size.If any exception like "Out of Memory" we should increase this memory size for the application from this run.conf file.

That is increase the range of Xms - Xmx value