Database Reference
In-Depth Information
You can also view the JVM performance details for the garbage collection activity by
adding the following parameters as part of the WebLogic start-up scripts:
•
-XX:+PrintGC
: Outputs the basic information at every garbage collec-
tion
•
-XX:+PrintGCDetails
: Provides the size of live objects before and
after garbage collection for the various generations, the total available
space for each generation, and the length of time the collection took
•
-XX:+PrintGCTimeStamps
: Provides a timestamp at the start of each
collection that helps us correlate garbage collection logs with other
logged events
•
Jmap
(
-histo:live pid
): Prints memory-related statistics for a run-
ning JVM or core file
You are recommended to create a table with JVM parameters and its impact on the
performanceduringthetuningprocess,asshowninthefollowingtableusingexcelor
word. In the tuning process always analyze GC activities for pause time, frequency,
and average memory footprint.
