Next attempt:
torch-1.8.0.dev20210208%2Bcu110-cp36-cp36m-linux_x86_64.whl
With
backend="nccl"
NCCL_DEBUG: INFO
NCCL_DEBUG_SUBSYS: ALL
Absolutely no change, dist.init_process_group(backend="nccl") hangs in both machines and no extra output is given