Re: [JAVA3D] Memory usage. Why?

[Paul Cohen]

Title: RE: [JAVA3D] Overlay example?

Hi all, Very good article on Java3D performance optimisation (and general Java optimisation) in Feb2001 Javareport. This artilcle is not online but I'm sure you can get a back copy, or ask them for one. Power Java High-Performance Java Software Development Roy Donehower James Schatzman Coding for efficiency can be much more important for Java than for C/C++. By following some straightforward, though perhaps surprising guidelines, many software projects can be effectively implemented in Java, giving excellent performance. ref: http://www.javareport.com/html/from_pages/index.asp?mon=2&yr=2001 Also useful is their review of Optimize it!. http://www.javareport.com/html/from_pages/article.asp?id=231&mon=2&yr=2001 -----Original Message----- From: Discussion list for Java 3D API [mailto:[EMAIL PROTECTED]]On Behalf Of Paula Keohan Sent: Wednesday, April 04, 2001 4:28 AM To: [EMAIL PROTECTED] Subject: Re: [JAVA3D] Memory usage. Why? Andrey,   How do you find out information like this? I've created an application in Java 3D and I get out of memory exceptions. How do you moniter how much memory is being consumed for particular parts of the program? If what's been said today about the memory that a TransformGroup takes is true, then that's probably my problem.   Regards, Paula. Hello David, Tuesday, April 03, 2001, 7:29:48 PM, you wrote: YDJ> I believe that unless your texture is by reference Java3d creates a YDJ> *retained* version (as it does for everything)  For most things this copy is YDJ> not that expensive, but for geometry and textures it is *quite* expensive. YDJ> When I profile my application I see approx 40 percent of my memory being YDJ> stored in retained versions of my scenegraph.  I can't really figure out why YDJ> it is necessary to do that.  The problem is that if you use by-reference for YDJ> things, to save memory, you also pay a performance penalty because Java3d YDJ> starts sending things every frame and stop using display lists. YDJ> Dave Yazel I think you're right, but look - Java3D takes memory twice: First - when I add Shape3D to BranchGroup Second - when I add BranchGroup to Universe in first time and in both cases - about 10Mb. And if I do BG.detach(); and then MyUniverse.addBranchGraph(BG); (second time) it DOESN'T TAKE MEMORY again. Do you know why it is so? YDJ> -----Original Message----- YDJ> From: Andrey [mailto:[EMAIL PROTECTED]] YDJ> Sent: Tuesday, April 03, 2001 12:10 PM YDJ> To: [EMAIL PROTECTED] YDJ> Subject: [JAVA3D] Memory usage. Why? YDJ> Hi everybody. YDJ> When create some textured object and then add then to  Branch group, it YDJ> takes YDJ> about 10Mb. OK. YDJ> But when I add a this BranchGroup to Universe, it takes in additional 8Mb. YDJ> So what does Java3D do when BranchGroup is adding to Universe to take so YDJ> much memory? YDJ> I got WindowsNT,RivaTNT2, jdk 1.2.1 with Java3D for OpenGL. YDJ> -- YDJ> Best regards, YDJ>  Andrey                            mailto:[EMAIL PROTECTED] YDJ> =========================================================================== YDJ> To unsubscribe, send email to [EMAIL PROTECTED] and include in the body YDJ> of the message "signoff JAVA3D-INTEREST".  For general help, send email to YDJ> [EMAIL PROTECTED] and include in the body of the message "help". YDJ> =========================================================================== YDJ> To unsubscribe, send email to [EMAIL PROTECTED] and include in the body YDJ> of the message "signoff JAVA3D-INTEREST".  For general help, send email to YDJ> [EMAIL PROTECTED] and include in the body of the message "help". -- Best regards,  Andrey                            mailto:[EMAIL PROTECTED] =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST".  For general help, send email to [EMAIL PROTECTED] and include in the body of the message "