Choose a garbage collection policy
There are four garbage collection policies available in the Java 5 IBM JVM.
The default GC policy is Optimal Throughput. For WAS applications, however, this is most likely not the best choice. Because throughput is the goal for this policy, longer pauses during garbage collection can be expected.
The two policies better suited for WAS applications are...
Generational Concurrent was designed with the typical characteristics of WebSphere applications in mind.
Subpool takes advantage of AIX and System p hardware features.