$ nvidia-smi topo -m
# started 2026-10-24 15:46:17 UTC, finished 2026-10-24 15:46:21 UTC, 4 s, exit 0
$ nvidia-smi topo -m
	GPU0	GPU1	GPU2	GPU3	GPU4	GPU5	GPU6	GPU7	CPU Affinity	NUMA Affinity	GPU NUMA ID
GPU0	 X 	NV18	NV18	NV18	NV18	NV18	NV18	NV18	0-23,96-119	0		N/A
GPU1	NV18	 X 	NV18	NV18	NV18	NV18	NV18	NV18	0-23,96-119	0		N/A
GPU2	NV18	NV18	 X 	NV18	NV18	NV18	NV18	NV18	0-23,96-119	0		N/A
GPU3	NV18	NV18	NV18	 X 	NV18	NV18	NV18	NV18	24-47,120-143	1		N/A
GPU4	NV18	NV18	NV18	NV18	 X 	NV18	NV18	NV18	48-71,144-167	2		N/A
GPU5	NV18	NV18	NV18	NV18	NV18	 X 	NV18	NV18	48-71,144-167	2		N/A
GPU6	NV18	NV18	NV18	NV18	NV18	NV18	 X 	NV18	48-71,144-167	2		N/A
GPU7	NV18	NV18	NV18	NV18	NV18	NV18	NV18	 X 	72-95,168-191	3		N/A

Legend:

  X    = Self
  SYS  = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
  NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
  PHB  = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
  PXB  = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
  PIX  = Connection traversing at most a single PCIe bridge
  NV#  = Connection traversing a bonded set of # NVLinks