Ok, I found it. I was running the jmap command as root, but I had to run as the user that started the java process. In my case: sudo -u robau ./jmap -dump:format=b,file=/tmp/dump.bin 14984 Seems to be related to this JDK bug: https://bugs.openjdk.java.net/browse/JDK-8075773
When you debug your app, open DDMS in Eclipse. On the toolbar there is a heap dump button that you can use to generate a heap dump to view in Eclipse memory analyzer. This is only supported I think with the 1.6+ or 2.0+ SDK.
A thread dump is a dump of the stacks of all live threads. Thus useful for analysing what an app is up to at some point in time, and if done at intervals handy in diagnosing some kinds of ‘execution’ problems (e.g. thread deadlock). A heap dump is a dump of the state of the … Read more
The best thing out there is Memory Analyzer (MAT), IntelliJ does not have any bundled heap dump analyzer.
You can use jmap to get a dump of any process running, assuming you know the pid. Use Task Manager or Resource Monitor to get the pid. Then jmap -dump:format=b,file=heap.hprof <pid> to get the heap for that process. For systems where bash and pgrep are installed and a single Java process is running, try: jmap … Read more