[Beowulf] GPU question

Carsten Aulbert carsten.aulbert at aei.mpg.de
Sat Aug 29 04:53:13 EDT 2009


Hi
On Saturday 29 August 2009 09:42:36 amjad ali wrote:
> I perceive following computing setups for GP-GPUs,
>
> 1)      ONE PC with ONE CPU and ONE GPU,
>
> 2)      ONE PC with more than one CPUs and ONE GPU
>
> 3)      ONE PC with one CPU and more than ONE GPUs
>
> 4)      ONE PC with TWO CPUs (e.g. Xeon Nehalems) and more than ONE GPUs
> (e.g. Nvidia C1060)

I think no one will be able to answer your question correctly. It will all 
boil down how your usage scenario will be, e.g. if your codes run only on the 
GPUs and you have hardly to do anything except providing the initial data to 
the GPUs I think you might even go to the extreme with a single box and 7 GPUs 
in it along with a quad CPU. On the other extreme you have code where only a 
fraction of the code (say 20%) can be put onto the GPU you will probably have 
to aim at a different CPU to GPU ratio.
>
> 5)      Cluster of PCs with each node having ONE CPU and ONE GPU
>
> 6)      Cluster of PCs with each node having more than one CPUs and ONE GPU
>
> 7)      Cluster of PCs with each node having ONE CPU and more than ONE GPUs
>
> 8)      Cluster of PCs with each node having more than one CPUs and more
> than ONE GPUs.
>
Same as above, it highly depends what will run on the cluster.
>
>
> IMPORTANT QUESTION: Will a cuda based program will be equally good for
> some/all of these setups or we need to write different CUDA based programs
> for each of these setups to get good efficiency?

Not much experience here, sorry

Carsten
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