Transport selection

oneCCL supports two transports for inter-node communication: Intel® MPI Library and Libfabric*.

The transport selection is controlled by CCL_ATL_TRANSPORT.

In case of MPI over Libfabric implementation (for example, Intel® MPI Library 2019) or in case of direct Libfabric transport, the selection of specific Libfabric provider is controlled by the FI_PROVIDER environment variable.