> Why not opencl?

Yes if we were going for a very simple OpenCL in Clojure Syntax, the
yes OpenCL is usable. However, last I checked, the OpenCL kernel
language did not support virtual functions or dynamic memory
allocation. That is only the CPU is allowed to allocate memory. This
is something that CUDA offers, and would be needed if we wanted a more
complete Clojure implementation running on the GPU.

So basically OpenCL has to cater to the lowest common denominator,
while CUDA is only really concerned with NVidia GPUs released in the
past few years. So it's a balance between power and compatibility.

Timothy

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