[Beowulf] Re: GPU Beowulf Clusters

[Patrick LeGresley]

I've found this presentation from John Stone at SC09 to be a very  
good comparison of CUDA versus OpenCL performance on real code:
>

http://www.ks.uiuc.edu/Research/gpu/files/openclbof_stone2009.pdf

My take away from this presentation, which matches my personal  
experience comparing the two, is that CUDA and OpenCL performance on  
NVIDIA hardware are within a few percent.  Trying to use the same  
source code on hardware from different vendors obviously has the  
expected performance pitfalls.

The biggest thing to watch out for may be performance regressions  
from one release of CUDA to the next, and even among slightly  
different driver versions.  You can see an example of this from John  
on slide 17.

Cheers,

Patrick