What should be the size of JVM Params in production server?

[surajyonzon]

As I am new to JBoss Production server.

Please help me to set the params in production server.

I have the following configuration:

CPU 8 * 2.66 GHz

RAM 6 GB

Currently, we are using JBoss AS 7.1.0 Final.

How much should I configure in JVM params for above configuration of hardware?

Currently, in production I have these params:

JAVA_OPTS: -d32 -client -Xms64m -Xmx512m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Dorg.jboss.resolver.warning=true -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true -Djboss.server.default.config=standalone.xml

and how to configure those JVM params?

[nickarls]

Max memory can be changed with the -Xmx switch. If you look on previous posts like this in the forum the most common response for the actual values is "depends on your application".

[surajyonzon]

Thanks for the reply.

I have no idea by the terms "depends on your application". I have  deployed the Enterprise Application using EJBs, JPA and JSF with Prime Faces and DB as PostgreSQL.

Do we have to consider all these things and if we have to, what kind of settings should we make for these kind of applications?

[nickarls]

You would need to check the application under load and find bottlenecks. With JConsole you can connect to the application and check approximately how much memory one user session takes up and multiply with best guess for number of concurrent users. Other considerations might be if you have to share the resources with other applications or not, how acceptable GC pauses are etc. Like I said, "depends on your application".