Friday Dec 18, 2009

JDK 6 Performance Features and Update

I presented the topic on Java SE 6 Performance Features and Update at Austin Java Users Group in December 2009. The slides are available here.

Friday Feb 13, 2009

Co-locating multiple instances of WebSphere on scalable Sun servers

Sun has been designing and selling highly scalable servers for about two decades now. It is interesting to see the progress of system architectures from .... [Read More]

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]

WebSphere Tuning Tip: Scalability on Solaris

If you see scalability issue with WebSphere Application Server on Solaris systems (especially on the CMT based servers), you should consider using an alternate memory allocator. The white paper titled "Improving Application Efficiency Through Chip Multi-Threading", has excellent explanation about the CMT and SPARC architecture overview and how to improve application performance and CMT system efficiency.[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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