Get java process heap dump and analyse it by jhat

1. Get all java processes ids
17:17 ~/java $ jps -vm
14970 Jps -vm -Dapplication.home=/usr/lib/jvm/java-7-oracle -Xms8m
8850 org.eclipse.equinox.launcher_1.3.0.v20130327-1440.jar -data /home/rivanov/workspace -os linux -ws gtk -arch x86_64 -showsplash /home/rivanov/ ..................... -Dosgi.requiredJavaVersion=1.6 -XX:MaxPermSize=256m -Xms40m -Xmx512m

2. generate heap dump for application, in my case it is Eclipse.

17:19 ~/java $ jmap -dump:format=b,file=eclipse_heap.bin 8850

Dumping heap to /home/rivanov/java/git/dmt/eclipse_heap.bin ...

Heap dump file created

3. run jhat tool from JDK to analyse heap dump.

17:19 ~/java $ jhat eclipse_heap.bin 

Reading from eclipse_heap.bin...

Dump file created Fri Jun 27 17:19:37 PDT 2014

Snapshot read, resolving...

Resolving 1548547 objects...

Chasing references, expect 309 dots.....................................................................................................................................................................................................................................................................................................................

Eliminating duplicate references.....................................................................................................................................................................................................................................................................................................................

Snapshot resolved.

Started HTTP server on port 7000

Server is ready.

4. Open in browser "http://localhost:7000/".

jhat is far from fancy heap dump analyser in comparison to Eclipse's MAT, jvisualvm, ...... but it is provided together with JDK and nothing should be installed .