This mirrors comments to the OSG mailing list, where people have reported
performance issues with multiple GPUs and screens. There hasn't been much of
a resolution there; some people have the problem, others don't. I've put
together a multi-GPU machine to explore these issues; now I just need to buy
another screen :)
What threading mode are using? Could you post a screenshot of the OSG
statistics (cycle debug statistics twice) and your X configuration file?
Tim
On Mon, Nov 1, 2010 at 9:06 AM, Torsten Dreyer <tors...@t3r.de> wrote:
> Hi,
>
> as pointed out in other threads, I am currently assembling a machine with
> five
> nVidia cards. The machine and the cards are fast enough to render a steady
> 60fps, synced to vblank.
> But this is only with shaders disabled. The moment, I enable shaders and
> 3d-
> clouds, the frame rate drops to 20fps and sometimes even less. This does
> not
> happen when I limit the display to just one single GPU. One GPU with dual
> screen ("TwinView") runs at framerates beyond limits even with all shaders
> on
> and quality level to highest. The moment I add a second card to the setup,
> it
> slows down significantly.
> I know that shaders are little program fragments running on the GPU itself.
> Now, what happens, if a shader effect spawns multiple GPU's, e.g. a cloud
> which is visible across the entire window?
>
> Cheers, Torsten
>
>
> ------------------------------------------------------------------------------
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------------------------------------------------------------------------------
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
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