Hi Ferdi, On Wed, Dec 24, 2008 at 11:16 AM, Ferdi Smit <[email protected]> wrote: > Is WGL_NV_gpu_affinity no longer useful on windows?
I believe it's a relatively new extension, so rather than no longer useful, it may be become useful, but just not deployed yet. I'm not very familiar with this extension don't know if it can directly address the performance issues you are seeing. More thoughts below. > Because it is not used > in the win32 graphics window. I'm asking this because even though I can open > rendering windows on two GPUs and use them in parallel in two distinct > processes (by having two screens, one for each gpu, just like in linux/X), > the frame rate is cut in half on windows, while it is not on linux. So I'm > wonder if rendering commands are actually still send to both cards. Driving > multiple GPUs independently is a pain anyhow... If things are performing under Windows it's most likely a driver issue. I can't see any reason why the way that the OSG is opening up windows under Windows, or he lack of gpu affinity extension as being the problem as normally the screen number and GPU attached to to the associated physical screen should provide all the info the driver needs to map things correctly. Linux/X11 works just fine with just the screen number so doesn't have any more information or controls that would make it behave differently, so it's all down to the driver/windowing system. Now it might be that the NVidia drivers under windows are a bit screwed when it comes to driving multiple displays and that one has to add the extra extension usage to give it the kick up the butt that it needs to do the right thing. Try experimenting with the gpu affinity extension see if it makes any difference. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
