rccl: rccl (ROCm Communication Collectives Library) rccl: rccl: RCCL (pronounced 'Rickle') is a stand-alone library of standard rccl: collective communication routines for GPUs, implementing all-reduce, rccl: all-gather, reduce, broadcast, reduce-scatter, gather, scatter, and rccl: all-to-all. There is also initial support for direct GPU-to-GPU send rccl: and receive operations. rccl: rccl: rccl: rccl: