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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