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Refer to the Intel oneAPI Collective Communications Library System Requirements for a full list of hardware and software dependencies, such as MPI and Intel oneAPI DPC++/C++ Compiler.
SYCL*-aware API is an optional feature of oneCCL. There is a choice between CPU and SYCL back ends when creating the oneCCL stream object.
For CPU backend: Specify ccl_stream_host as the first argument.
For SYCL backend: Specify ccl_stream_cpu or ccl_stream_gpu depending on the device type.
For collective operations that operate on the SYCL stream:
For C API, oneCCL expects communication buffers to be sycl::buffer objects casted to void*.
For C++ API, oneCCL expects communication buffers to be passed by reference.
Additional usage details are available from https://oneapi-src.github.io/oneCCL/.
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