This ccl_2021.15.3-arc branch adds support for Intel ARC A and B Series GPU and some bug fixes.
An example of the cmake command for Intel ARC A Series GPU :
cmake .. -DCMAKE_INSTALL_PREFIX=_install -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -DCOMPUTE_BACKEND=dpcpp -DCCL_ENABLE_ARCA=1
An example of the cmake command for Intel ARC B Series GPU :
cmake .. -DCMAKE_INSTALL_PREFIX=_install -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -DCOMPUTE_BACKEND=dpcpp -DCCL_ENABLE_ARCB=1
If the system does not have GPU Peer-to-Peer (P2P) support, you will need to add this compiler environment flag (export IGC_VISAOptions=-activeThreadsOnlyBarrier) before compiling. Similarly, on a system without P2P support, add export IGC_VISAOptions=-activeThreadsOnlyBarrier to your command line before running the application.