how exactly do you suggest I set them to null? I don't keep an explicit
reference
to them...should I be?
Mario
Mariusz Zaczek
NASA - Johnson Space Center
Automated Vehicles and Orbit Analysis / DM35
Flight Design and Dynamics Division
Mission Operations Directorate
Bldg: 30A Room: 3040A
Disclaimer: "The opinions, observations and comments expressed in my email
are strictly my own and do not necessarily reflect those of
NASA."
-----Original Message-----
From: Trung Tran [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 05, 2003 2:10 PM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] ? Garbage Collection - memory does not decrease ?
I believe that when you remove the children, those children are taken out
of the branchgroup but the references to those children still are valid so
GC did not remove them. GC will probably removes those children later on
when it determined that the children are no longer being used. A simple
method to trick GC to collect the removed children would be setting the
children to null after you removed them from the branchgroup (to the best
of my knowledge, try it out)
t
At 10:49 AM 3/5/2003 -0600, you wrote:
>Below is a copy of a post someone put to this group in 1998!!! There was no
>answer
>in that thread and searching the archives I have not yet found an
>answer...so, I'm
>going to ask you all about it. Do you know how to get back the memory after
>removing
>a child from a parent?
>
>I run my code where I have a function to add 3D spheres to a 3D canvas:
>
> void addSpheres() {
> for (int i=0; i<1000; i++)
> mainBranchGroup.addChild(new sphere(...));
> }
>
>Later on I remove the spheres:
>
> void removeSpheres() {
> mainBranchGroup.removeAllChildren();
> }
>
>BUT, running java -verbose:gc myProgram
>Shows NO decrease in memory....I only see a steady increase in memory used
>as I add more
>spheres, but if I remove them I don't see any memory decrease.
>
>I am quite confident I have NO reference to the new sphere() anywhere else
>so I don't see
>why the memory should not be released....any hints/thoughts/suggestions?
...
>or is this
>a persistent problem in Java3D?
>
>I've also tried the System.gc(); call periodically but I find that it does
>nothing for me...
>and by the Javadocs for it I can see that this call MAY or MAY NOT do
>anything...kind of wierd.
>
>Thanks,
>
> Mario
>
>
>
> >> -----Original Message-----
> >> From: Jon Barrilleaux [SMTP:[EMAIL PROTECTED]
> >> Sent: Friday, October 09, 1998 2:25 PM
> >> Subject: [java3d] garbage collection after removing nodes
> >>
> >> Someone reported on this list a while back that memory was not being
> >> freed after releasing a large number of Group nodes. I never saw an
> >> answer to this on the list.
> >>
> >> I've observed a similar problem. I create a large scene in a
> >> BranchGroup and add it to my scene. Memory usage goes up. After
> >> removing it from its parent BranchGroup and then running System.gc()
> >> the memory usage does not change. I'm pretty sure that I don't have a
> >> lingering reference. Repeating this cycle of adding a new scene graph
> >> and then removing it only causes the memory size to grow.
> >>
> >> Is this a known bug or am I missing something?
> >>
> >> --jon
>
>
>
>
> Mario
>
>Mariusz Zaczek
>NASA - Johnson Space Center
>Automated Vehicles and Orbit Analysis / DM35
>Flight Design and Dynamics Division
>Mission Operations Directorate
>Bldg: 30A Room: 3040A
>
>Disclaimer: "The opinions, observations and comments expressed in my email
> are strictly my own and do not necessarily reflect those of
>NASA."
>
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