Hi Wojciech, Thank you for taking the time to reply to my question. I made some progress. First I use only one monitor per GPU because I need color calibration for my photography work and the Windows architecture has only one LUT per card. But I temporarily hooked up the second monitor to the first card and activated SLI.
The same issue occurs in osgViewer : only the primary display is refreshed. But FlightGear has a handy configuration system where we can setup windows/graphic contexts and cameras separately. As you suggested, when I create only one window that span on both monitors (on screen 0) and bind the two cameras to two viewports of this window, both viewports are updated. I have a vague recollection that my setup with 1 monitor per GPU and 2 graphic contexts used to work with a 2.9 OSG. Unfortunately FlightGear has evolve in a way that it requires 3.0 but I will try to get osgViewer work with an older version. I also remember seeing submissions on the way swapping is done in OSG. Maybe there is something related Regards, -Fred ----- Mail original ----- De: Wojciech Lewandowski Hi, Frederic, I was testing similar situation on GeForces more than 2 years ago (I left the building in the meantime) and honestly don't remember if we have found 'an always working' recipee for this problem. All I remember we were somehow able to use multiple cards with multiple monitors but honestly I am not sure if this was just luck with drivers or we did some extra tricks (we tried several workarounds back then). This problem is probably related to Windows DWM screen update scheme vs NVidia optimizations and Windows 7 design that primary card renders all OpenGL contexts so second card is practically not used. I could be wrong but I believe we had most success with NVidia surround where we set up single Window spanning all monitors and this window was split into 3 or 4 viewports matching particular monitors. So I really don't have a solution but would recommend to test various options and select the best one. - Test single card dual monitor output vs dual card sli dual monitor vs dual card / dual monitor. I remember that after this test we realized it does not make sense to buy second card which is practically not used. SLI mode seemed to not bring more performence in our scenarios (this may vary for you of course). So we realized that unless we do not want to use more than 2 monitors we will not buy another card. And even with more monitors it would make sense to buy powerful card as primary and weak one as secondary adapter because it will be practically used as passthrough for graphics rendered on first one. For Surround mode it may be neccessary to use the same cards though, (don't remember exactly). Above problem only affects GeForces. Quadros provide extension which can be used to assign GPU to window. h ttp://developer.download.nvidia.com/opengl/specs/WGL_nv_gpu_affinity.txt Unfortuantely NVidia chose to not provide it for GeForces. I also believe that Radeons have introduced similar extension a year or two ago. - Do above tests with NVidia surround. - Try playing with NVidia control panel settings (threading optimization / swap method) And certainly must have options are: - Aero off / fullscreen mode to avoid DWM quirks HTH, Wojtek Lewandowski 2012/5/20 Frederic Bouvier < [email protected] > Paul, I see the same issue with 3.1.2 Regards, -Fred ----- Mail original ----- De: "Frederic Bouvier" < [email protected] > À: "OpenSceneGraph Users" < [email protected] > Envoyé: Dimanche 20 Mai 2012 10:10:42 Objet: Re: [osg-users] Multiple GPU/monitor issue on Windows 7/NVidia Hi Paul, I should have stated that I am using OSG 3.0.1. Is there a fix in a development release ? Regards, -Fred ----- Mail original ----- De: "Paul Martz" < [email protected] > I thought this was an old issue already fixed. Are you saying this is still occurring on the current OSG trunk? What versions of OSG have you tested? -Paul On 5/19/2012 9:03 AM, Frederic Bouvier wrote: > Hi, > > I am pretty sure it has been discussed before, but I am unable to retrieve > the > right thread, so ... > > I have a dual card setup, each driving a single monitor. When I start > osgViewer, > the viewer span on both screen, an initial image is displayed on both too, > but > only the primary display is updated when I change the camera view with the > mouse. Clicking on the frozen screen and then on the live screen update the > image on the frozen screen but only for one frame. > > I have the last WHDL NVidia driver. Cards are 2 GF GTX470 and I tried with > and > without SLI enabled. The same problem occurs in a multiscreen setup of > FlightGear. > > Any idea ? > > Regards, > -Fred > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
