ghw /sys/devices/system/node/node0/cpu0/online: no such file or directory

Hello,

When I try to list cpu information that is numa related it is getting the error: /sys/devices/system/node/node0/cpu0/online: no such file or directory Seems that online is not available anymore on this location for some linux distros. However with lscpu | grep -i numa we have an output listing the nodes and cpus per node. And with /sys/devices/system/cpu/online it reports the online cpus.

Maybe first check if the first path is available and if not go through the other option ti get cpus per node that are online.

Nov 07 '24 16:11 peter81git

@peter81git thanks for the issue! can you let us know what version of ghw you're using? thank you!

Nov 07 '24 17:11 jaypipes

We are using version v0.13.0

Nov 07 '24 17:11 peter81git

One more option is to use lscpu -be that gives cpu,node,core, online info.

CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE    MAXMHZ   MINMHZ      MHZ
  0    0      0    0 0:0:0:0          yes 3800.0000 800.0000 2500.000
  1    0      0    1 1:1:1:0          yes 3800.0000 800.0000 1300.000
  2    0      0    2 2:2:2:0          yes 3800.0000 800.0000 1300.000
  3    0      0    3 3:3:3:0          yes 3800.0000 800.0000 1300.000
  4    0      0    4 4:4:4:0          yes 3800.0000 800.0000 1300.000
  5    0      0    5 5:5:5:0          yes 3800.0000 800.0000 1300.000
  6    0      0    6 6:6:6:0          yes 3800.0000 800.0000 1300.000
  7    0      0    7 7:7:7:0          yes 3800.0000 800.0000 1300.000
  8    0      0    8 8:8:8:0          yes 3800.0000 800.0000 1300.000
  9    0      0    9 9:9:9:0          yes 3800.0000 800.0000 1300.000
 10    0      0   10 10:10:10:0       yes 3800.0000 800.0000 1300.000
 11    0      0   11 11:11:11:0       yes 3800.0000 800.0000 1300.000
 12    0      0   12 12:12:12:0       yes 3800.0000 800.0000 1300.000
 13    0      0   13 13:13:13:0       yes 3800.0000 800.0000 1300.000
 14    0      0   14 14:14:14:0       yes 3800.0000 800.0000 1300.000
 15    0      0   15 15:15:15:0       yes 3800.0000 800.0000 1300.000
 16    0      0   16 16:16:16:0       yes 3800.0000 800.0000 1300.000
 17    0      0   17 17:17:17:0       yes 3800.0000 800.0000 1300.000
 18    0      0   18 18:18:18:0       yes 3800.0000 800.0000 1300.000
 19    0      0   19 19:19:19:0       yes 3800.0000 800.0000 1300.000
 20    0      0   20 20:20:20:0       yes 3800.0000 800.0000 1300.000

And to have only the cpu, node, core and online we can lscpu -p=cpu,node,core,online or lscpu -e=cpu,node,core,online

Nov 07 '24 18:11 peter81git

hi @peter81git ! which distribution version and kernel version are you running and getting this error?

Nov 14 '24 13:11 ffromani

@ffromani and @peter81git , seems this issue is same with https://github.com/jaypipes/ghw/issues/375

can we close this issue?

Nov 30 '24 17:11 coyang

I checked the commit on the #375 issue and seems to validate if the file exists before getting the value, however it is not checking if the system is numa capable or not adapting the info retrieval.

Nov 30 '24 17:11 peter81git