How to analyze PermGen space?

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How to analyze PermGen contents?

I want to know what is occupying the PermGen space - string intern() or classes? Is there any tool which will help with this analysis?

Those links should answer your first question: http://stackoverflow.com/questions/1262328/how-is-the-java-memory-pool-divided/1262474#1262474 and http://stackoverflow.com/questions/9095748/method-area-and-permgen. — assylias, May 25 '12 at 11:03
Look at this question: http://stackoverflow.com/questions/2842982/how-to-analyze-permgen-contents — Konstantin V. Salikhov, May 25 '12 at 11:18
@Perception They give some information about what goes to PermGen but your link is admittedly better. — assylias, May 25 '12 at 11:20
@assylias - The OP does appear to know what PermGen is for, hence my comment. In any case, the question looks like a duplicate. — Perception, May 25 '12 at 11:32
I tried the utility to print a running JVM's string literal pool(https://github.com/puneetlakhina/javautils/blob/master/com/blogspot/sahyog/PrintStringTable.java)... But i'm getting below error... Attaching to process ID 8980, please wait... Error attaching to process: Timed out while attempting to connect to debug server (please start SwDbgSrv.exe).. — user1325695, May 25 '12 at 11:52
@user1325695 You should create a new question with that issue. — assylias, May 25 '12 at 14:50

score 3 · Accepted Answer · edited May 09 '16 at 13:21

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For Memory Analysis

Use jvisualvm.exe present in bin directory of JDK
Using jvisualvm take the Thread/Heap dump depending on the process id of the Application you need to profile.
Memory Analyzer (MAT) an eclipse plugin. where you can import the heap dump from jvisualvm and analyze for possible leaks.

edited May 09 '16 at 13:21

jbochi

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answered May 25 '12 at 11:59

Srinivas M.V.

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Don't you mean heap dump instead of thread dump? – tom May 25 '12 at 12:59
@tom If you want to do a CPU profiling then take thread dump . if you want to do a memory Analysis take a heap dump .. – Srinivas M.V. Jun 01 '12 at 08:11
He is talking about memory and your response states thread dump. – tom Jun 01 '12 at 09:05
@tom thanks i missed it added – Srinivas M.V. Jun 01 '12 at 09:48
@Downvoter please provide the reason , It helps me to correct myself if i have gone wrong or answer is wrong. Thanks :) – Srinivas M.V. Apr 12 '13 at 09:46

score 1 · Answer 2 · answered May 25 '12 at 11:21

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You can use monitoring tools that are in the bin folder of your jdk, as "jvisualvm" or "jconsole"

answered May 25 '12 at 11:21

Xosler

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score 0 · Answer 3 · answered May 25 '12 at 11:51

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I use Yourkit to analyse what is in the heap-space. It is not free but it is a really big help when analysing memory issues and/or performance issues. (They have an evaluation version)

answered May 25 '12 at 11:51

tom

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How to analyze PermGen space?

3 Answers3

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