Hi Paul, I just did a test on my Kubuntu system and used top to track the CPU utilization and found that when spinning the cow.osg CPU usage is very low, but when I stop the model spinning the CPU usage goes up to 100%. Ooops looks like the code is going into a spin lock. However, if I enable the limiting of the frame rate CPU usage when using run-on-demand goes back down to near 0:
osgviewer --run-max-frame-rate 100 --run-on-demand cow.osg So my guess is that the frame loop, when runing on demand, is just running in a continuous loop checking where a new frame is required. The solution to high CPU utilization is likely to be just to add a sleep when on demand rendering is enabled and there is nothing to do. I'll look into this. Robert. On Wed, Apr 14, 2010 at 2:22 PM,osgviewer --run-max-frame-rate 100 --run-on-demand cow.osg Paul Gotzel <paul.got...@us.cd-adapco.com> wrote: > Robert, > > Are you referring to a vsync option on my graphics card? I'm running Linux > and I have an option called Sync to VBlank. Checking or unchecking this > option has no effect. I also run develop other OpenGL applications without > this problem so I doubt it is a graphics card setting. > > I'm running the distributed 2.9.7 (debug) version of the osgviewer with the > following command: > > $ osgviewerd --run-on-demand cow.osg > > I also saw this with 2.8.2. I don't rotate the view or move the mouse. Any > thoughts? I'll try to debug it to see what logic is actually using CPU. > > Thanks, > Paul > > > Robert Osfield wrote: > > Hi Paul, > > On Tue, Apr 13, 2010 at 10:46 PM, Paul Gotzel > <paul.got...@us.cd-adapco.com> wrote: > > > Something I've noticed since I started using osg is that the viewer uses all > of one cpu even when the view is not changing. > > > Do you have vsync off? If so enable it right away. You should only > ever have vsync off if you are doing very specific types of > benchmarking. Vsync off wastes energy and ruins visual quality. > > > > I've tried passing the > --run-on-demand option to osgviewer and doing > viewer.setRunFrameScheme(osgViewer::ViewerBase::ON_DEMAND); in code and > there is no difference. What gives? > > > On demand rendering checks to see if the the scene graph needs > updating, if it does it lets the frame go ahead. Perhaps you have > something that animates in your scene. > > Robert. > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
