Thanks for your replies. Robert, I am using windows XP Pro with service pack 2. The problem happens with GeForce 8800 GTX cards.
Will, is there any solution to this or do I need to change my graphics cards? Regards, Shamim On Nov 12, 2007 5:53 AM, Will Dicharry <[EMAIL PROTECTED]> wrote: > Hi, I am not sure if this is the same problem, but I have an > application that uses large paged databases and have seen a slow down > on a higher end machine with a GeForce 7900 The slow down was only on > Windows, Linux ran fine. After tracking it down, I found out that the > bottleneck was actually in the graphics drivers. After installing an > older version of the drivers, the performance went back up again. > I've also seen the same behavior on a machine with a GeForce 8800 GTX. > Unfortunately, I cannot find an older version of the drivers for that > card. Again, I don't know if this is the same problem, but the > performance loss on a higher end machine rang a bell in my head. > > Will > > On Nov 10, 2007 12:31 AM, Akhtar Shamim <[EMAIL PROTECTED]> wrote: > > Dear All, > > > > Lately I had been seeing a very obscure problem with our OSG > application. > > > > The application uses a very large Terra Vista paged terrain. I see the > > following two phenomena: > > > > 1. With all our old computers (i.e. computers having a single core CPU, > 1 GB > > or less RAM and with graphics card < NVidia 6600) the application gives > a > > constant update rate of 60 Hz. No problem with any refresh rate issues. > > > > 2. However, when I try the same application on a high end machine (Dual > Core > > CPU or Quad Core CPU and with graphics card 7800 GT++) the performance > is > > very poor and quite unpredictable. I looked at the CPU usages and found > that > > the CPU usage is below 20 % for most of the CPUs. The application crawls > at > > less than 6-7 Hz. However, if I change the BIOS setting to use only one > CPU > > the application is back to normal and runs at constant 60 Hz. > > > > It seems to me that the database pager isnt working perfectly with > multiple > > CPUs and gets deadlocked. I am very confused with this situation. For > our > > deployment we have all new machines with dual and quad core CPUs and > latest > > graphics cards. > > > > I would be very happy to hear suggestion/advice on how to solve this > > performance issue. To be honest I am quite stuck with the problem. I > have > > tried compiling our application with OSG 1.2 and OSG 2.0. The phenomenon > is > > the same. > > > > Best regards. > > > > _______________________________________________ > > 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 >
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