[Tip] Online CPU Core Disable/Enable

## cpu core #7 Disable ##

echo 0 > /sys/devices/system/cpu/cpu7/online

 

## cpu core #7 Enable ##

echo 1 > /sys/devices/system/cpu/cpu7/online

 

## 확인 방법 ##

lscpu 또는 cat /proc/cpuinfo

 

### 명령어 실행 결과 및 확인 ####

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# lscpu

Architecture:          x86_64

CPU op-mode(s):        32-bit, 64-bit

Byte Order:            Little Endian

CPU(s):                8

On-line CPU(s) list:   0-7

Thread(s) per core:    2

Core(s) per socket:    4

Socket(s):             1

NUMA node(s):          1

Vendor ID:             GenuineIntel

CPU family:            6

Model:                 60

Model name:            Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Stepping:              3

CPU MHz:               3880.914

BogoMIPS:              6784.67

Virtualization:        VT-x

L1d cache:             32K

L1i cache:             32K

L2 cache:              256K

L3 cache:              8192K

NUMA node0 CPU(s):     0-7

 

# echo 0 > /sys/devices/system/cpu/cpu7/online

 

# lscpu

Architecture:          x86_64

CPU op-mode(s):        32-bit, 64-bit

Byte Order:            Little Endian

CPU(s):                8

On-line CPU(s) list:   0-6

Off-line CPU(s) list:  7

Thread(s) per core:    1

Core(s) per socket:    4

Socket(s):             1

NUMA node(s):          1

Vendor ID:             GenuineIntel

CPU family:            6

Model:                 60

Model name:            Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Stepping:              3

CPU MHz:               3820.218

BogoMIPS:              6784.67

Virtualization:        VT-x

L1d cache:             32K

L1i cache:             32K

L2 cache:              256K

L3 cache:              8192K

NUMA node0 CPU(s):     0-6

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