Well, performance isn't the issue. Like the parent said, the problem is mostly that CUDA is such a radically mature API and everything else isn't. You might be able to reimplement all the PCIe operations using OpenCL, but how long would that take and who would sponsor the work? Nvidia simply does it, because they know the work is valuable to their customers and will add to their vertical integration.
OpenCL isn't bad, and I'd love to see it get to the point where it competes with CUDA as originally intended. The peaceable sentiment of "let's work together to kill the big bad demon" seems to be dead today, though. Everyone would rather sell their own CUDA-killer than work together to defeat it.
OpenCL isn't bad, and I'd love to see it get to the point where it competes with CUDA as originally intended. The peaceable sentiment of "let's work together to kill the big bad demon" seems to be dead today, though. Everyone would rather sell their own CUDA-killer than work together to defeat it.