[osg-users] Rendering on two GPUs under linux
jan.ciger at gmail.com
Fri Nov 20 13:13:24 PST 2009
"Roman Grigoriev" <grigoriev at gosniias.ru> wrote:
> Thanx for you reply. But you see I'm sure that under windows it's not
> possible to render on two Geforce cards and nvidia guys told me that I
> need to buy Quadro. My app works fine and do some render but only one GPU
> calculate graphics. And in SLI mode you have only one virtual GPU visible
> to OS. And that's why I decide to move on linux. Today only CUDA can work
> on two Geforce under windows, and nvidia cuts some functionality in
> Geforce cards. When I run my code on linux I haven't got any speedup of
> using two GPUs. And that's why I ask about this subject.
Roman, you can set your system up in such way that each GPU is assigned one X
screen (not Twinview where you have one large desktop stretched over the
cards). Then OSG will use two graphic contexts and render on both cards for
On the other hand, I doubt that you will see much of a speedup compared to a
single card. If you are rendering for an HMD and do not have some kind of
special, high-end high resolution one, you are most likely bound by the CPU
and not the GPUs. Usual HMDs that I have seen have resolutions from about
320x240 (low end) up to about 1280x1024 (decent, expensive stuff like Kaiser) -
the GPU you are mentioning should be able to cope with that easily.
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