#57 simple heap dump

[Anonymous]

it would be useful if the wrapper allowed a simple heap dump.

http://www.virtualmachine.de/heapprofile/heapprofile.c could be a
starting point

[Leif Mortenson]

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That is a neat little tool. I will have to play around
with it a bit to see whether that functionality would be
worth including in the Wrapper itself.

For now, I was able to build the DLL on Windows using the
instructions at the top of the page. I put the resulting
heapprofile.dll file in the same directory as the wrapper.dll.

Then added the following to my wrapper.conf
set.PATH=%PATH%;../lib
wrapper.java.additional.1=-Xrunheapprofile

Just doing that, the tool seemed to work just fine with the
Wrapper out of the box. It created a heap.dump file on
shutdown in the bin directory.

If you are doing a dump of a large application, you may need
to extent the exit timeout as follows to prevent the Wrapper
from killing the JVM process while it is writing out the file:
wrapper.jvm_exit.timeout

The requested thread dump also seems to work correctly.
When you request it, the regular JVM thread dump is also
displayed.

Is there a reason why you want this included in the Wrapper
rather than using this tool as is? It would be nice if a
binary was provided as building from source is a pain.

I will look into how that tool could be used however.

Cheers,
Leif