Tap on heap while debugging

[Hendrik Maryns]

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Hi,

I have written a fairly complex program which converts mathematical
formulae into tree automata, and am in the process of trying it out with
different formulas. The results are discouraging, I get an
OutOfMemoryError: Java heap space with fairly small formula. Now I have
some hashmaps which I suspect from being the cause of this problem, but
I can’t seem to pin down which one. I would like to do a debugging run
and see how the heap space is distributed among the objects that are
created.

So the question: is there some debugging program which shows a
(preferably graphical) view of the heap space and the size of the
objects in it, and how they evolve. I use Eclipse, but having to
inspect manually those hashes after each few steps is difficult. Nicest
would be to have some flowing chart which shows the big memory consumers.

Any ideas how to approach this?

Thanks, H.
- --
Hendrik Maryns

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[Oliver Wong]

So the question: is there some debugging program which shows a
(preferably graphical) view of the heap space and the size of the
objects in it, and how they evolve. I use Eclipse, but having to
inspect manually those hashes after each few steps is difficult. Nicest
would be to have some flowing chart which shows the big memory consumers.

Many profilers will report memory usage.

These two profilers report memor usage as part of their feature list, but
they cost money:

http://www.yourkit.com/overview/index.jsp
http://www.ej-technologies.com/products/jprofiler/features.html

There's a list of open source java profilers at
http://java-source.net/open-source/profilers I leave it up to you to read
their descriptions to find out which ones support memory usage analysis.

- Oliver

 

[IchBin]

Many profilers will report memory usage.

These two profilers report memor usage as part of their feature list,
but they cost money:

http://www.yourkit.com/overview/index.jsp
http://www.ej-technologies.com/products/jprofiler/features.html

There's a list of open source java profilers at
http://java-source.net/open-source/profilers I leave it up to you to
read their descriptions to find out which ones support memory usage
analysis.

- Oliver

If you are running Netbeans, they have an addon Profiler.
http://profiler.netbeans.org

Eclipse also has their profiler called tptp (Eclipse Test and
Performance Tools Platform). Both could help you out.
http://www.eclipse.org/tptp


Thanks in Advance...
IchBin, Pocono Lake, Pa, USA
http://weconsultants.servebeer.com/JHackerAppManager
__________________________________________________________________________

'If there is one, Knowledge is the "Fountain of Youth"'
-William E. Taylor, Regular Guy (1952-)