Thursday Feb 12, 2009

Are you aware of JVM Ergonomics?

In JDK 5, a new performance feature for self tuning of the JVM known as JVM Ergonomics was added. .... [Read More]

Tuesday Feb 10, 2009

Updating WebSphere, Java and Solaris for Better Performance and Reliability

Keeping your WebSphere application environment on Solaris updated with the recommended Fix Packs and Service Releases from IBM and Solaris update releases and patches is a key to better performance and reliability. For example, if you have WebSphere Application Server v6.1 with Fix Pack 5, you may find slowness in the garbage collection process using the throughput collector (ParallelGC).[Read More]

Monday Oct 06, 2008

WebSphere Application Server and JVM Options

For WebSphere Application Server (WAS) on Solaris, IBM bundles it with the Sun JVM that contains IBM's modifications (e.g. IBM ORB, XML and Security libraries) as explained in this blog entry by my colleague Dileep Kumar of Sun.

More specifically, you can find the summary of WAS and its Java versions in the table below. Additional details can be located at this IBM site.

WAS v7.0Java EE 5JDK/JRE 6
WAS v6.1J2EE 1.4JDK/JRE 5
WAS v6.0.2J2EE 1.4JDK/JRE 1.4.2
WAS v5.1.1J2EE 1.3JDK/JRE 1.4.2
WAS v5.1J2EE 1.3JDK/JRE 1.3.x

In order to tune WAS JVM on Solaris, it is greatly helpful if you understand the performance tuning aspects of Sun JVM such as Java memory management, Garbage Collectors, etc. You can get performance whitepapers for respective JVM versions here and Java Memory Management Whitepaper. Dileep also has blogged about specific recommended JVM options for WAS on Solaris here.

Finally, there are numerous Sun JVM options and one of the references that I strongly recommend is the collection compiled by Joseph D. Mocker of Sun Microsystem. Of course, we have much more specific information about WAS v6.1 on Solaris 10 in this IBM Redbook (e.g. Chapter 9).

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