Hi all,
I really appreciate all of the feedback.
Chris:
Yes, I tested osgviewer.exe in release-mode with the cow.osg model, and the
problem is always reproducible.
It seems the spinlock is occurring somewhere in the
OpenThreads::StartPrivateAction::StartThread thread, if that helps at all.
I will be doing some testing on some other systems, as Robert suggests, to see
if the problem is persistent on other systems.
So far, a Windows XP SP3 box with an 8800 GTX also seems to be suffering from
the high CPU utilization.
Regards,
Kim.
> From: yefei...@uiowa.edu
> To: osg-users@lists.openscenegraph.org
> Date: Thu, 17 Sep 2009 11:51:01 -0500
> Subject: Re: [osg-users] OSG CPU Utilization
>
> 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
_________________________________________________________________
Microsoft brings you a new way to search the web. Try Bing™ now
http://www.bing.com?form=MFEHPG&publ=WLHMTAG&crea=TEXT_MFEHPG_Core_tagline_try
bing_1x1_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
