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Mon, 23 November 2009 04:08

Eclipse User

Hello,
I have a problem of memory consumption in my RCP.
When I launch my application, the memory consumption is about 100Mo, but during its used, it can rise to 600Mo, and it never decreases after.

I would like to know if it is possible to deallocate memory and how, in order to decrease memory consumption?

Thanks for your help.
David.

Re: Memory consumption [message #499529 is a reply to message #499528]

Mon, 23 November 2009 04:23

Eclipse User

You likely have a memory leak somewhere; some static variable holding a pointer to something for example.

You may need to get a profiling tool (like Jprofiler) to find the objects that are in memory and why they are there.

Re: Memory consumption [message #501365 is a reply to message #499528]

Tue, 01 December 2009 18:10

Eclipse User

David CHAUTARD schrieb:
> Hello,
> I have a problem of memory consumption in my RCP.
> When I launch my application, the memory consumption is about 100Mo, but
> during its used, it can rise to 600Mo, and it never decreases after.
>
> I would like to know if it is possible to deallocate memory and how,
> in order to decrease memory consumption?
>
> Thanks for your help.
> David.
>

Probably you have some kind of Packratting problem.
Following steps may help you to find the culprit for your problem.

Connect to your program with jconsole
dump the heap to a file xyz.hprof (MBeans -> com.sun.management ->
HotSpotDiagnostics -> Operations)

then use Eclipse MAT ( http://www.eclipse.org/mat/ ) to analyze the heap
to find some object that dominates large ammounts of data...

Re: Memory consumption [message #501388 is a reply to message #499528]

Wed, 02 December 2009 00:46

Eclipse User

Have a look at the MAT project. Little intro:
http://www.vogella.de/articles/EclipseMemoryAnalyser/article .html

David CHAUTARD wrote:
> Hello,
> I have a problem of memory consumption in my RCP.
> When I launch my application, the memory consumption is about 100Mo, but
> during its used, it can rise to 600Mo, and it never decreases after.
>
> I would like to know if it is possible to deallocate memory and how,
> in order to decrease memory consumption?
>
> Thanks for your help.
> David.
>

Re: Memory consumption [message #501875 is a reply to message #501388]

Fri, 04 December 2009 04:16

Eclipse User

Hello,
thanks for your answers.
I try to use Memory Analyzer (MAT), but I can't generate the .hprof file. I launch my product, with the VM arguments (Run configuration) :

-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=8084
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
-XX:+HeapDumpOnOutOfMemoryError

Then I perform some actions in order to increase the memory consumption. I can see the consumption climbing from 200Mo to 570Mo in the Windows tasks manager, but no file is generated.

Did I forget something, what should I do to get this file?
Thanks,
David.

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