Slurm slurmd -C detects only 8 CPUs instead of 20 (Intel Ultra 7 265K, hwloc 2.10) [closed]

I’ve set up a Slurm cluster following the official quickstart admin guide:https://slurm.schedmd.com/quickstart_admin.htmlBoth slurmctld and slurmd are running as services, but I’ve run into a CPU detection issue.

My system has 20 CPUs, confirmed by lscpu:

$ lscpuArchitecture:                x86_64CPU(s):                      20On-line CPU(s) list:         0-19Vendor ID:                   GenuineIntelModel name:                  Intel(R) Core(TM) Ultra 7 265KThread(s) per core:          1Core(s) per socket:          20Socket(s):                   1

The hardware topology (lstopo) also shows 20 processing units (screenshot attached).However, when I run slurmd -C, it only reports 8 CPUs:

$ slurmd -CNodeName=mone-workstation CPUs=8 Boards=1 SocketsPerBoard=1 CoresPerSocket=8 ThreadsPerCore=1 RealMemory=128154 Gres=gpu:nvidia_geforce_rtx_5090:1Found gpu:nvidia_geforce_rtx_5090:1 with Autodetect=nvmlUpTime=0-15:56:54

Versions installed:

$ slurmd --versionslurm 25.05.3$ dpkg -l | grep hwlocii  hwloc             2.10.0-1build1   amd64ii  libhwloc-dev      2.10.0-1build1   amd64ii  libhwloc-plugins  2.10.0-1build1   amd64ii  libhwloc15        2.10.0-1build1   amd64

And this is the hardware topology:

$ lstopo-no-graphics | grep PU      L2 L#0 (3072KB) + L1d L#0 (48KB) + L1i L#0 (64KB) + Core L#0 + PU L#0 (P#0)      L2 L#1 (3072KB) + L1d L#1 (48KB) + L1i L#1 (64KB) + Core L#1 + PU L#1 (P#1)      L2 L#2 (3072KB) + L1d L#2 (48KB) + L1i L#2 (64KB) + Core L#2 + PU L#2 (P#2)      L2 L#3 (3072KB) + L1d L#3 (48KB) + L1i L#3 (64KB) + Core L#3 + PU L#3 (P#3)      L2 L#4 (3072KB) + L1d L#4 (48KB) + L1i L#4 (64KB) + Core L#4 + PU L#4 (P#4)      L2 L#5 (3072KB) + L1d L#5 (48KB) + L1i L#5 (64KB) + Core L#5 + PU L#5 (P#5)      L2 L#6 (3072KB) + L1d L#6 (48KB) + L1i L#6 (64KB) + Core L#6 + PU L#6 (P#6)      L2 L#7 (3072KB) + L1d L#7 (48KB) + L1i L#7 (64KB) + Core L#7 + PU L#7 (P#7)        L1d L#8 (32KB) + L1i L#8 (64KB) + Core L#8 + PU L#8 (P#8)        L1d L#9 (32KB) + L1i L#9 (64KB) + Core L#9 + PU L#9 (P#9)        L1d L#10 (32KB) + L1i L#10 (64KB) + Core L#10 + PU L#10 (P#10)        L1d L#11 (32KB) + L1i L#11 (64KB) + Core L#11 + PU L#11 (P#11)        L1d L#12 (32KB) + L1i L#12 (64KB) + Core L#12 + PU L#12 (P#12)        L1d L#13 (32KB) + L1i L#13 (64KB) + Core L#13 + PU L#13 (P#13)        L1d L#14 (32KB) + L1i L#14 (64KB) + Core L#14 + PU L#14 (P#14)        L1d L#15 (32KB) + L1i L#15 (64KB) + Core L#15 + PU L#15 (P#15)        L1d L#16 (32KB) + L1i L#16 (64KB) + Core L#16 + PU L#16 (P#16)        L1d L#17 (32KB) + L1i L#17 (64KB) + Core L#17 + PU L#17 (P#17)        L1d L#18 (32KB) + L1i L#18 (64KB) + Core L#18 + PU L#18 (P#18)        L1d L#19 (32KB) + L1i L#19 (64KB) + Core L#19 + PU L#19 (P#19)        GPU(Display) ":1.0"

So far I’ve confirmed:

• Hardware and OS see all 20 CPUs.
• hwloc-ls (via lstopo) correctly shows all 20 cores.
• Slurm itself (via slurmd -C) only detects 8.

Questions:

1. Why does slurmd only detect 8 CPUs when the system clearly has 20?
2. Could this be an issue with Slurm’s hwloc integration (2.10 vs Slurm 25.05.3)?
3. Is there a config tweak that I need to adjust so Slurm sees all CPUs?

Any guidance on how to make Slurm recognize all 20 CPUs would be appreciated.