Re: [osg-users] Parallel Rendering Problems using NVidia GPU cards in Windows
On 29. Jun 2012, at 21:03, WangWentao wrote: how about 2 same GPUs? First one is chosen. Stefan. -- http://www.eyescale.ch http://www.equalizergraphics.com http://www.linkedin.com/in/eilemann ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Parallel Rendering Problems using NVidia GPU cards in Windows
On 26. Jun 2012, at 8:57, GeeKer Wang wrote: In fact, Windows NVidia driver will try to send OpenGL cammands to all GPU when SLI model disabled. NVidia drivers =256.0 send the commands to the most powerful GPU and then blit the result to the display GPU. You can override the GPU on a per-application base in the control panel, afaik. On Linux this is a non-issue, as you address the GPUs through X screens. Cheers, Stefan. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Parallel Rendering Problems using NVidia GPU cards in Windows
how about 2 same GPUs? 在 2012-6-29，21:18，Stefan Eilemann eilem...@gmail.com 写道： On 26. Jun 2012, at 8:57, GeeKer Wang wrote: In fact, Windows NVidia driver will try to send OpenGL cammands to all GPU when SLI model disabled. NVidia drivers =256.0 send the commands to the most powerful GPU and then blit the result to the display GPU. You can override the GPU on a per-application base in the control panel, afaik. On Linux this is a non-issue, as you address the GPUs through X screens. Cheers, Stefan. ___ 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
Re: [osg-users] Parallel Rendering Problems using NVidia GPU cards in Windows
Hi, Jason It's a GPU issue. I just want to verify the scalability of multi-GPU in windows, and the answer is disappointing. Few NVIDIA GPU cards support GPU-affinity in Windows, and SLI mode is the only way to use multi-cards. In fact, Windows NVidia driver will try to send OpenGL cammands to all GPU when SLI model disabled. In linux, the default behavior is each GPU is bind to a screen. On Mon, Jun 25, 2012 at 10:18 PM, Jason Daly jd...@ist.ucf.edu wrote: On 06/25/2012 12:59 AM, GeeKer Wang wrote: Hi, all I want to use two GTS 250 cards to do the parallel rendering job based on OpenSceneGraph。 In my experiment, a scene full of complex models is split to 2 parts according to viewport。 The 2 parts are rendered in seperated windows (actually two slaves). I hope the LEFT part is rendered in the first screen and by the first GPU, and the RIGHT part in the second screen and by the second GPU。 The results are a little wierd and disappointing. Hi, Bob, The additional card will only help if your application is GPU-bound (that is, waiting on the GPU to finish rendering a frame before the next can start). Another possibility is that it is CPU bound (the CPU is taking most of the time and the GPU is waiting on it), and another is that it is interconnect bound (the bus between the CPU or RAM and the GPU is the bottleneck). Just adding another card will not help if you're CPU-bound or interconnect bound, and it can actually make things worse if your scene isn't set up in an optimal way. You might end up trying to cram twice the amount of data down the bus in order to try and keep both GPUs fed, and this will kill performance even more than with a single card. One quick fix you can try is to run the osgUtil::Optimizer on your scene with the option VERTEX_PRETRANSFORM | INDEX_MESH | VERTEX_POSTTRANSFORM. This will optimize the vertex data for the vertex cache common on modern GPUs, and may help with bus bandwidth. The other key is to be sure that your scene is organized and subdivided spatially, so that when you're viewing the scene, you don't end up duplicating draw calls across the GPUs. Hope this helps, --J __**_ osg-users mailing list osg-users@lists.**openscenegraph.org osg-users@lists.openscenegraph.org http://lists.openscenegraph.**org/listinfo.cgi/osg-users-** openscenegraph.orghttp://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Bob ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Parallel Rendering Problems using NVidia GPU cards in Windows
On 06/25/2012 12:59 AM, GeeKer Wang wrote: Hi, all I want to use two GTS 250 cards to do the parallel rendering job based on OpenSceneGraph。 In my experiment, a scene full of complex models is split to 2 parts according to viewport。 The 2 parts are rendered in seperated windows (actually two slaves). I hope the LEFT part is rendered in the first screen and by the first GPU, and the RIGHT part in the second screen and by the second GPU。 The results are a little wierd and disappointing. Hi, Bob, The additional card will only help if your application is GPU-bound (that is, waiting on the GPU to finish rendering a frame before the next can start). Another possibility is that it is CPU bound (the CPU is taking most of the time and the GPU is waiting on it), and another is that it is interconnect bound (the bus between the CPU or RAM and the GPU is the bottleneck). Just adding another card will not help if you're CPU-bound or interconnect bound, and it can actually make things worse if your scene isn't set up in an optimal way. You might end up trying to cram twice the amount of data down the bus in order to try and keep both GPUs fed, and this will kill performance even more than with a single card. One quick fix you can try is to run the osgUtil::Optimizer on your scene with the option VERTEX_PRETRANSFORM | INDEX_MESH | VERTEX_POSTTRANSFORM. This will optimize the vertex data for the vertex cache common on modern GPUs, and may help with bus bandwidth. The other key is to be sure that your scene is organized and subdivided spatially, so that when you're viewing the scene, you don't end up duplicating draw calls across the GPUs. Hope this helps, --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Parallel Rendering Problems using NVidia GPU cards in Windows
Hi, all I want to use two GTS 250 cards to do the parallel rendering job based on OpenSceneGraph。 In my experiment, a scene full of complex models is split to 2 parts according to viewport。 The 2 parts are rendered in seperated windows (actually two slaves). I hope the LEFT part is rendered in the first screen and by the first GPU, and the RIGHT part in the second screen and by the second GPU。 The results are a little wierd and disappointing. Experiment condition: GigaByte Motherboard EX58-UD3R, 2 GTS 250 Cards, Windows XP, driver 285.58 gpuz are used to monitor the GPUs. There are 3 SLI options: Maximize 3D performance, Activate all displays, Disable SLI CASE 1: 1 screen and 1 GPU, 1 window Frame Rate: 8.4 GPU Load: 100% CASE 2: 2 screens and 2 GPU, 2 windows, the scene are split Frame Rate: 3.5 GPU1 Load: 60% GPU2 Load: 60% CASE 3: 2 screens and 2 GPU, 1 window in 1st screen Frame Rate: 8.4, 14 if only half of the scene is rendered GPU1 Load: 100% GPU2 Load: 100% CASE 1,2,3 are the same for Activate all displays and Disable SLI mode。 When I use Maximize 3D performance mode, and use the SLI connector to connect the 2 GPU cards, there is only 1 screen left。 But according to the gpuz, only 1 GPU is working。 CASE 4: 1 screen and 2 GPUs, 1 window Frame Rate: 8.4 GPU1 Load: 100% GPU2 Load: 0% CASE 5: 1 screen and 2 GPUs, 2 window Frame Rate: 3.5 GPU1 Load: 60% GPU2 Load: 0% My assumption that 2 GPUs can work independently seems not right. And the SLI is also not working。 It looks like there is always only 1 GPU working, even the other GPU is full of load。 So my problem is: 1. In windows, how can I let the 2 GPUs work independently and bind the screen with the GPU. 2. Why the SLI mode seems failed? Are there some special configurations? Any advice will be appreciated! -- Bob ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
