Show the default value chosen for XX:ParallelGCThreads

Dherik :

I'm tuning the JVM of Java 8 and I'm trying to know what value was defined for the parameter -XX:ParallelGCThreads. The documentation says:

-XX:ParallelGCThreads: Sets the number of threads used during parallel phases of the garbage collectors. The default value varies with the platform on which the JVM is running.

I would like to know what value was defined in my platform and if I need to change that. I don't have in this environment a JDK available, only the JRE.

Eugene :

Default value :

 java -XX:+PrintFlagsFinal | grep ParallelGCThreads
 uint  ParallelGCThreads                        = 4

If you have a running process jinfo <processId>, if it's not present in the output, it is using the default value (look under VM Flags)

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