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On a machine with dual-GPU and which are connected with NVLink, you will most likely see something like: GPU0 GPU1 CPU Affinity NUMA Affinity GPU0 X NV2 0-23 N/A GPU1 NV2 X 0-23 N/A on a different machine w/o NVLink we may see: GPU0 GPU1 CPU Affinity NUMA Affinity GPU0 X PHB 0-11 N/A GPU1 PHB X 0-11 N/A The report includes this 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 So the first report NV2 tells us the GPUs are interconnected with 2 NVLinks, and the second report PHB we have a typical consumer-level PCIe+Bridge setup. |