[jitter] hardware questions

hello list, we are still trying to figure out what would be the  
fastest PC configuration for jitter texture/gpu usage.
Is Jitter taking advantage of multiple graphic cards in SLI?
Best, Lucas

On Feb 1, 2008, at 6:51 PM, vade wrote:

> your biggest speed increase would probably come from uploading uyvy  
> matrices as texture data, you would almost halve your bandwidth to  
> the GPU (and potentially CPU processing as well), you could then use  
> the cc.uyvy2rgba.jxs shader family to do YUV to RGBA conversion on  
> the GPU.
>
> Check the optimization threads about this technique. It works for  
> movies, so it should work for arbitrary matrix data being treated as  
> imagery on the GPU.
>
> That machine is really fast, from what I can tell. I bet you would  
> be better off optimizing your patch. jit.change, and asymmetric  
> bangs to jit.gl.render vs metros to what your matrix/CPU land stuff  
> is doing would help, along with qmetro/qlim magic, etc.
>
> its hard to tell w/o a patch.
>
> On Feb 1, 2008, at 11:44 AM, subzero wrote:
>
>> Hello list,
>> we are reconfiguring our WinXP PC at the moment to speed up the fps  
>> in jitter. We use it basically to generate big matrixes (1920*1200)  
>> and process these on the GPU.
>> One of the bottle necks in this system seems to be loading the  
>> matrix on the GPU as a texture. We did a lot of tweaking in jitter  
>> to make this as efficient as possible. So the next step is to  
>> upgrade the hardware, to speed up the fps.
>> For this we have the following questions:
>> What is the best choice of CPU? Is it more important to have the  
>> fastest CPU's, the fastest CPU busspeed, or the size of the L2-cache?
>> Regarding the motherboard, is the busspeed critical? And what about  
>> the ammount and the speed of the memory?
>>
>> We currently use a 8800 GTX 768mb graphics card, with the Asus P5B  
>> Deluxe wifi (busspeed 1066mhz, 4GB 667-DDR2), and a Core 2 Quad CPU  
>> (Q6600 4 x 2400mhz, with a busspeed of 1066mhz and 8mb L2 cache)
>>
>> Hope some of you can shed some light on these matters,
>>
>> Best Lucas
>>
>>
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