CODEWITHSUNDEEP
javagarbage-collection
Aleš
Aleš

Reputation: 9028

Howto easily monitor usage of Eden and Survivor Spaces

What is the best way howto monitor usage of Eden and Survivor heap spaces?

I have all the GC logging options on but I can see only YoungGen occupation:

-XX:+PrintTenuringDistribution -XX:+UnlockDiagnosticVMOptions -XX:+LogVMOutput -XX:LogFile=jvm.log -server -XX:+HeapDumpOnOutOfMemoryError -XX:+DisableExplicitGC -Xloggc:gc.log -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -showversion -XX:+PrintClassHistogramBeforeFullGC -XX:+PrintClassHistogramAfterFullGC -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:MaxTenuringThreshold=15

I would use VisualGC but cannot find its distribution anywhere. The default distribution of VisualVM that comes with JDK does not come with VisualGC. The VisualGC plugin links to the VisualGC site are broken.

UPDATE: jstat is what I was looking for, specifically :

    jstat -gcutil -t <pid> <interval> <number_of_samples>

Upvotes: 2

Views: 2901

Answers (3)

Stephen C
Stephen C

Reputation: 719376

According to this page, you can download the relevant plugin center "updates.xml" file, an install it per the instructions. Then you can install the VisualGC plugin.

But the page also says that you should simply be able to install plugins using "Tools | Plugins | Available Plugins".

The links to projects on java.net are often broken in my experience. You typically have to look harder to find stuff that is hosted there.

Upvotes: 3

Ryan Stewart
Ryan Stewart

Reputation: 128909

Depending on what you mean by "monitor", you might just need jstat. Check out the -gc* options.

Upvotes: 3

OmniOwl
OmniOwl

Reputation: 5709

If I understand you correctly, I think you can use JVisualVM to monitor your Java applications.

Upvotes: 3

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