Re: Resource Leak

• To: John J Brecht <john.brecht@xxxxxxx>
• Subject: Re: Resource Leak
• From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Date: Wed, 02 Oct 2002 09:02:58 -0600

One more noted on this issue.  If I put a sleep of 100 ms in
after the setRange(), I don't get the memory problem showing up.
With 10 ms sleep, the problem persists.  To me, the interesting
thing is how fast the memory useage creeps up.

Don

John J Brecht wrote:

after reading this:
http://java.sun.com/products/java-media/3D/java3dfaq-1.3.html#memory
and very briefly skimming through this link that it points to:

http://developer.java.sun.com/developer/technicalArticles/ALT/RefObj/index.html

I did a quick experiment and added these two lines:

               xmap = null;
               xmap = new ScalarMap( RealType.Time, Display.XAxis );

just before the line:

               xmap.setRange(then, now);

and it looks like the memory problem goes away. Chances are that Java3D (especially with VisAD on top of it) is chock full of these "weak" and "phantom" references mentioned in the article. I didn't read enough of the article to understand how to properly use the Reference API, but I imagine building that into VisAD might be the proper solution to this problem. Meanwhile, trying setting anything to null that you can!

-john

Tom Whittaker wrote:

Doug:

I echo Don's comments "that's some leak". What's interesting is that if the display (in Don's modified code) is covered up by another window, the memory starts increasing again (on Windoz). It also exhibits some interesting behaivor whilst minimized. (I'm using the -verbose:gc option to watch the GC run.)

Also, periodically, I get this exception:

java.lang.ClassCastException: javax.media.j3d.GeometryAtom

at javax.media.j3d.TransformGroupRetained.setTransform(TransformGroupRet

ained.java:161)

at javax.media.j3d.TransformGroup.setTransform(TransformGroup.java:111) at visad.java3d.DisplayRendererJ3D.setTransform3D(DisplayRendererJ3D.jav

a:1255)

at visad.java3d.ProjectionControlJ3D.setMatrix(ProjectionControlJ3D.java

:102)

at visad.java3d.DisplayRendererJ3D.setWaitFlag(DisplayRendererJ3D.java:1

377)
        at visad.DisplayImpl.doAction(DisplayImpl.java:1411)
        at visad.ActionImpl.run(ActionImpl.java:303)
        at visad.util.ThreadPool$ThreadMinnow.run(ThreadPool.java:95)

No help (sorry), just observations...

tom

--
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************

• Follow-Ups:
  • Re: Resource Leak
    • From: Doug Lindholm
  • Re: Resource Leak
    • From: Tom Rink

• References:
  • Resource Leak
    • From: Doug Lindholm
  • Re: Resource Leak
    • From: Don Murray
  • Re: Resource Leak
    • From: Tom Whittaker
  • Re: Resource Leak
    • From: John J Brecht