Symptoms:

• Application is running out of memory
• Application is performing slow because of frequent Garbage collection

There are various way you can take heap dump of CQ application:

Automatic Heap Dump:

• Using Command line argument:

You can use following JVM_OPTS to take automatic heap dump -XX:+HeapDumpOnOutOfMemoryError and

-XX:HeapDumpPath=/path/to/generate/heapdump more information about argument is here

• Through CQ Console:

Manual Thread dump:

• Using CQ Console

• Using jmap
  1. First find process ID of CQ process using ps -ef | grep java | grep <author or publish> command
  2. Then you can run jmap command to get heap dump jmap -dump:format=b,file=/path/to/generate/heapdumpfile.hprof <PID>

Once you have heap dump you can use any heap dump analyzer tool to analyze heap dump.

1. http://www.eclipse.org/mat/

Some Useful links:

1. http://helpx.adobe.com/crx/kb/AnalyzeMemoryProblems.html
2. http://docs.oracle.com/javase/6/docs/technotes/tools/share/jhat.html