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> Some of the world's largest super-computers / HPC applications do use SYCL for AMD! The application I'm most aware of for this is GROMACS. As to why? - because having 3 version of the same code using different programming APIs is a big maintenance burden.

The fact that GROMACS is unwilling to drop CUDA support to stand fully behind SYCL is very telling.

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I wouldn't expect them to drop CUDA support, even if SYCL is a viable alternative: * The CUDA backend is mature, featureful, and significant effort has been invested into optimising it on Nvidia hardware. One does not simply throw away a performant, well validated HPC code! * Nvidia GPUs dominate the GPGPU market - unlike AMD's. * The SYCL backend is still is very new in comparison (they even state in the docs to pay extra attention to validation), and doesn't have Nvidia-specific optimisations yet. Why prioritise reimplementing what already exists?

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