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by rrss 2039 days ago
The fact that oneAPI depends on OpenCL on some platforms is mostly an implementation detail, though, and isn't generally visible to applications, which are written in SYCL/DPC++. The current works to implement oneAPI for AMD and Nvidia hardware don't use OpenCL (hipSYCL and sycl-cuda). IMO, that some people think oneAPI is the future is an indication that OpenCL is "falling apart," not evidence that it is improving.

Vendors which have had decent OpenCL implementations for a long time (i.e. Intel) will implement oneAPI on top of OpenCL, others will not (if they implement oneAPI at all).
1 comments
jcranmer 2039 days ago
oneAPI is not being run on top of OpenCL; it's being run on top of Level Zero. Although I think the CPU runtime is still using the OpenCL driver for the moment.
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rrss 2039 days ago
That depends if you use the OpenCL SYCL backend or the Level Zero SYCL backend. The latter has only existed for a few months.

but yeah, I think the default backend switched to level zero recently, so strikethrough the last sentence of my comment - apparently nobody will focus on opencl as a oneAPI backend.

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