...
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[root@cld-dfa-gpu-04 Samples]# nvidia-smi topo -m
GPU0 GPU1 CPU Affinity NUMA Affinity
GPU0 X SYS 0,2,4,6,8,10 0
GPU1 SYS X 1,3,5,7,9,11 1
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 |
the CPU affinity shown above is truncated, another way to show it is looking at the file below:
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[root@cld-dfa-gpu-04 ~]# cat /sys/bus/pci/devices/0000:17:00.0/local_cpulist
0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100,102,104,106,108,110
[root@cld-dfa-gpu-04 ~]# cat /sys/bus/pci/devices/0000:ca:00.0/local_cpulist
1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81,83,85,87,89,91,93,95,97,99,101,103,105,107,109,111
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where 0000:17:00.0 and 0000:ca:00.0 identify the GPUs through their Bus ID (found e.g. with "lspci | grep NVI" command).