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Date: Wed, 11 Apr 2012 06:46:04 +0200
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: Cuda for nV OpenCL for AMD?

Now we are in the situation that Johns OpenCL build "supports" nvidia
and amd cards. This leads to problem that opencl kernels are much
slower than cuda code for nvidia's cards. To get rid of it we would
have to write separate OpenCL kernels for AMD, nVidia and possibly CPU
in the future.
Can't we just make all cuda formats available for amd devices, and
same thing for nvidias?
Then we will have to create/manage 2 versions of each format rather than 3.

Of course some could say "hey what with users with nv and amd in one box?"
1) They can run two separate instances.
2) Maybe it wont be difficult to create MPI version that interconnects
multiple builds?
3) Is this situation common?

I think that we should not care about other CUDA capable devices other
than GPU's unless they won't be on market (If they ever will be)
Do you see any other pros and cons with this "divorce"?

Lukas

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