We have found that the paged database's performance is quite sensitive the settings used in the database pager. If you look at the pager, you can set a number of environment variables to tweak things. We were able to more than double our framerate and work around frame hiccups just by adjusting values.
Windows doesn't seem to handle threads as well as linux, too, so if you only have once core/cpu, you'll have very bad paging behavior on windows, but not linux. A multi-core box seems to do much better. On Thursday 14 August 2008 01:07:00 pm Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC wrote: > I would like to get some feedback from users that might be rendering OSG > terrain built with osgdem on Windows XP. Based on previous discussions, I > understand that the terrain rendering on Windows does not have as good of > performance as on Linux, however, I'm seeing abysmal frame rates when I'm > rendering terrain on Windows. The paging performance is horrible. Perhaps > it's the way I'm constructing my terrain or the setup in my OSG app.I'm not > sure. > > > > While I don't understand the algorithm that is being used for OSG terrain, > I would expect it to perform as good or somewhat close to other Windows > based earth viewers such as NASA's WorldWind which seems to run just fine > on Windows with large databases. > > > > For the record, here's the osgdem command I'm using to build the terrain. > > > > osgdem -TERRAIN -PagedLOD -geocentric -t dted -d texture -l 10 -o > terrain/wasatch_utm.ive > > > > Any input on the matter would be appreciated. > > -Shayne -- David Guthrie [EMAIL PROTECTED] Alion Science and Technology BMH Operation - A CMMI Maturity Level 3 Organization 5365 Robin Hood Road, Suite 100 Norfolk, VA 23513-2416 (757) 857-5670, ext 269, Fax (757) 857-6781 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
