查看CPU信息

# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 13
Stepping:              3
CPU MHz:               2400.084
BogoMIPS:              4800.16
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K
NUMA node0 CPU(s):     0
			

禁用谋个CPU(含超线程)

# chcpu -d 3
CPU 3 disabled

# lscpu -c --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
3   -    -      -    :::           no

# lscpu -b --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
0   0    0      0    0:0:0:0       yes
1   0    0      1    1:1:1:0       yes
2   0    0      2    2:2:2:0       yes
4   0    1      3    3:3:3:1       yes
5   0    1      4    4:4:4:1       yes
6   0    1      5    5:5:5:1       yes
7   0    1      6    6:6:6:1       yes

# lscpu --all --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
0   0    0      0    0:0:0:0       yes
1   0    0      1    1:1:1:0       yes
2   0    0      2    2:2:2:0       yes
3   -    -      -    :::           no
4   0    1      3    3:3:3:1       yes
5   0    1      4    4:4:4:1       yes
6   0    1      5    5:5:5:1       yes
7   0    1      6    6:6:6:1       yes

# chcpu -d 3
CPU 3 is already disabled

# chcpu -d 1
CPU 1 disabled

# chcpu -d 3
CPU 3 disabled

# chcpu -d 5
CPU 5 disabled

# chcpu -d 7
CPU 7 disabled

# lscpu --all --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
0   0    0      0    0:0:0:0       yes
1   -    -      -    :::           no
2   0    0      1    1:1:1:0       yes
3   -    -      -    :::           no
4   0    1      2    2:2:2:1       yes
5   -    -      -    :::           no
6   0    1      3    3:3:3:1       yes
7   -    -      -    :::           no
			

启用谋个CPU

# chcpu -e 3
CPU 3 enabled

# lscpu --all --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
0   0    0      0    0:0:0:0       yes
1   0    0      1    1:1:1:0       yes
2   0    0      2    2:2:2:0       yes
3   0    0      3    3:3:3:0       yes
4   0    1      4    4:4:4:1       yes
5   0    1      5    5:5:5:1       yes
6   0    1      6    6:6:6:1       yes
7   0    1      7    7:7:7:1       yes
			

0 号 CPU不允许禁用

# lscpu --all --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
0   0    0      0    0:0:0:0       yes
1   -    -      -    :::           no
2   -    -      -    :::           no
3   -    -      -    :::           no
4   -    -      -    :::           no
5   -    -      -    :::           no
6   -    -      -    :::           no
7   -    -      -    :::           no

# chcpu -d 0
CPU 0 is not hot pluggable
			

1号处于启用状态，0号仍然不能禁用

# lscpu --all --extended
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE
0   0    0      0    0:0:0:0       yes
1   0    0      1    1:1:1:0       yes
2   -    -      -    :::           no
3   -    -      -    :::           no
4   -    -      -    :::           no
5   -    -      -    :::           no
6   -    -      -    :::           no
7   -    -      -    :::           no

# chcpu -d 0
CPU 0 is not hot pluggable