Re: [Opensg-users] memory leaks?

[Michael R. <mic...@gm...>]

Hi all,

1.) I'm using OpenSG on Windows.

2.) FCFactory registry might be the problem. I've attached a sample application, in which i create und destroy a set of dummy objects each containing 3 nodes, 1 transform core and 2 group cores.
For a set size of 50000 dummy objects, i can discover leaks of approx. 3MBs after unloading the objects. Does this size sound reasonable for you?

many thanks,
Michael

-------- Original-Nachricht --------
> Datum: Fri, 27 Mar 2009 10:56:25 -0500
> Von: Dirk Reiners <dir...@gm...>
> An: ope...@li...
> Betreff: Re: [Opensg-users] memory leaks?

> 
> 	Hi Michael,
> 
> Michael Raab wrote:
> > Hi all,
> > 
> > i'm using openSG 1.8 as basis for our vr application. When loading and
> > unloading our scenarios i discovered some memory leaks. Searching in my
> > source code helped not to close them. I wrote a small test benchmark in
> which
> > i create 50000 objects where each object creates 3 opensg nodes, 1
> transform
> > core and 2 groups. After destroying my 50000 objects, the opensg nodes
> and
> > cores are successfully destroyed, if i can trust the fc statistics
> > (http://opensg.vrsource.org/trac/wiki/Tutorial/OpenSG1/Memleak). So are
> there
> > any known memory leaks that are caused by opensg?
> 
> First: how big is the memleak? But a few KB or does grow without bound?
> 
> In general OpenSG 1 handles cleanup reasonably well, as long as you use
> RefPtrs 
> or manage the refcount yourself.
> 
> I see two possibilities:
> 
> - ChangeList is not cleared. If you set it to read/write at the beginning
> of the 
> program you need to clear it occasionally or it will grow without bounds.
> - FCFactory registry. The FCFactory keeps a registry, a simple vector, for
> all 
> created FCs, which doesn't shrink when objects are deleted (to make sure
> IDs are 
> unique). If you create this many objects regularly even a few bytes in
> that 
> vector can add up.
> 
> Are you on Linux or Windows? If Linux I recommend running it through
> valgrind, 
> which pretty reliably will find mem leaks. I don't know any equivalent
> tools on 
> Windows though.
> 
> Can you send us your test program? We can give it a look and see if there
> is 
> something unusual.
> 
> Yours
> 
> 	Dirk
> 
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