nvidia-smi topo -m
GPU0 GPU1 GPU2 GPU3 GPU4 GPU5 GPU6 GPU7
GPU0 X NV1 NV2 NV1 SYS SYS SYS NV2
GPU1 NV1 X NV1 NV2 SYS SYS NV2 SYS
GPU2 NV2 NV1 X NV2 SYS NV1 SYS SYS
GPU3 NV1 NV2 NV2 X NV1 SYS SYS SYS
GPU4 SYS SYS SYS NV1 X NV2 NV2 NV1
GPU5 SYS SYS NV1 SYS NV2 X NV1 NV2
GPU6 SYS NV2 SYS SYS NV2 NV1 X NV1
GPU7 NV2 SYS SYS SYS NV1 NV2 NV1 X
nvidia-smi nvlink --status -i 0
GPU 0: Tesla V100-SXM2-32GB (UUID: GPU-4b6ebbfe-8eac-8fed-1939-b4c545eafa7f)
Link 0: 25.781 GB/s
Link 1: 25.781 GB/s
Link 2: 25.781 GB/s
Link 3: 25.781 GB/s
Link 4: 25.781 GB/s
Link 5: 25.781 GB/s