Some WebLogic Administrators consider JVM tuning as the top tuning recommendation for WebLogic. But nowadays, with the newer JVM releases, just setting -Xms and -Xmx arguments and leaving the GC with default throughput GC mode, should be fine for most of the WebLogic applications. Since R28, the Oracle JRockit behaves very well out of the box and, in the majority of the cases, more advanced JVM tunings are not necessary.

There are some situations where a specific WebLogic application could not wait for a full GC that lasts more than a few seconds. In this recipe, the GC mode will be changed to the pausetime mode for this particular application.