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Java : how to check current Perm / PermGen Size?

Answer 1

A:

As far as I know, you can only change them by passing those arguments to the JVM (as you did). So, what's wrong with manually checking the values passed in (or assuming default values, if you're not specifying them)?

Matt Ball 2010-09-16 00:41:25

@Bears will eat you: I was thinking there might be another way, but thanks for your clarification on this approach.

Michael Mao 2010-09-16 00:46:36

Answer 2

+2 A:

You can use something like VisualVM, http://java.dzone.com/articles/best-kept-secret-jdk-visualvm&default=false&zid=159&browser=16&mid=0&refresh=0, to monitor your memory usage and you will see the max by where it peaks, and it will give you specific info as to which part of memory is actually full, so you can better optimize your environment.

You may find that some part of memory that you don't think about is actually filling up, and by monitoring it you can see what you need to do to get better performance.

James Black 2010-09-16 00:48:20

+1 for checking using a performance tool

linuxuser27 2010-09-16 00:53:15

Answer 3

+5 A:

You can check the values of any JVM flags of a running JVM by using the jinfo.exe utility.

%JAVA_HOME%\bin\jinfo.exe -flag <flagName> <pid>

so to check the value of -XX:PermSize JVM option you can run

%JAVA_HOME%\bin\jinfo.exe -flag PermSize <pid>

Strelok 2010-09-16 00:49:21

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Java : how to check current Perm / PermGen Size?

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