Recently I noticed something that might be related as well. The draw stage of my application seems to be blocking on vsync signal, rather than the swap buffers stage. It happens on Windows XP boxes with NVidia cards, regardless if it is the older GeForce 8000 and 9000 series cards or the newer 200 and 300 series. I noticed that after I upgraded the video driver to the 190.62 version from August, but it may have happened before that. One caviar is that my application is based on an older version of OSG from 2006 that still uses Producer. Another thing is the set up has two monitors of different specs configured as dual view, and a render context is created for each monitor. I don't know if the latest version of OSG will be any different. Very interestingly, the same exact executable runs fine on Windows 7 boxes, with vsync blocking taking place during swap buffers as supposed to be. Our current solution to the unsavory vsync blocking behavior on Win XP boxes is to turn vsync off and use some Direct-X function call that checks for display scan lines to mitigate tearing. It only avoids tearing on one display, though.
Cheers, Yefei -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Chris 'Xenon' Hanson Sent: Thursday, September 17, 2009 10:49 AM To: OpenSceneGraph Users Subject: Re: [osg-users] OSG CPU Utilization Robert Osfield wrote: > Try a different OS/drivers. Also once you home in what combination > causes the high CPU utilization go pester NVidia about there driver > doing a spinlock. Agreed, it appears this way. Though, I've not seen NVidia Windows drivers spinlock before. Is the problem reproducible with plain release-mode osgviewer with the cow.osg model? If it is, then it's something that you can send to NVidia with all pieces necessary for reproducing it at their site. > Robert. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
