Hi Everybody, http://cr.openjdk.java.net/~dsamersoff/JDK-8059036/webrev.09/
Please review updated webrev - printFinalizationQueue now returns and array of Map.Entry<String, int[]) and all formatting is done on VM side. -Dmitry On 2015-05-21 02:07, Mandy Chung wrote: > >> On May 19, 2015, at 11:51 PM, Dmitry Samersoff >> <dmitry.samers...@oracle.com <mailto:dmitry.samers...@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. > > Mandy -- Dmitry Samersoff Oracle Java development team, Saint Petersburg, Russia * I would love to change the world, but they won't give me the sources.
