RFR(M, v7): JDK-8059036 : Implement Diagnostic Commands for heap and finalizerinfo
mandy.chung at oracle.com
Wed May 20 23:07:21 UTC 2015
> On May 19, 2015, at 11:51 PM, Dmitry Samersoff <dmitry.samersoff at oracle.com> wrote:
> Other alternatives could be to do all hashing/sorting/printing on native
> layer i.e. implement printFinalizationQueue inside VM.
> Both options has pros and cons - Java based solution requires less JNI
> calls and better readable but takes more memory.
> It might be better to return an array of Map.Entry<String, int>
> objects to VM rather than one huge string.
The output and formatting should be done by jcmd. What you really need to get a peek on the finalizer queue and print the histogram. The VM has the heap histogram implementation. Have you considered leveraging that?
5: 1012 40480 java.lang.ref.Finalizer
You can find the registered Finalizer instances. The downside is that icmd -finalizerinfo stops the world. I think it’s not unreasonable for this diagnostic command to be expensive like -heap command.
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