Linux系统下如何查看CPU个数

查看逻辑CPU个数：

#cat /proc/cpuinfo |grep "processor"|sort -u|wc -l
24

查看物理CPU个数：

#grep "physical id" /proc/cpuinfo|sort -u|wc -l
2

#grep "physical id" /proc/cpuinfo|sort -u
physical id : 0
physical id : 1

查看每个物理CPU内核个数：

#grep "cpu cores" /proc/cpuinfo|uniq
cpu cores : 6

每个物理CPU上逻辑CPU个数：

#grep "siblings" /proc/cpuinfo|uniq
siblings : 12

判断是否开启了抄超线程：

如果多个逻辑CPU的"physical id"和"core id"均相同，说明开启了超线程

或者换句话说

逻辑CPU个数 > 物理CPU个数 * CPU内核数 开启了超线程

逻辑CPU个数 = 物理CPU个数 * CPU内核数 没有开启超线程

一次性查询所有信息：

#!/bin/bash

physicalNumber=0
coreNumber=0
logicalNumber=0
HTNumber=0

logicalNumber=$( grep "processor" /proc/cpuinfo | sort -u| wc -l)
physicalNumber=$( grep "physical id" /proc/cpuinfo | sort -u| wc -l)
coreNumber=$( grep "cpu cores" /proc/cpuinfo | uniq | awk -F ':' '{print $2}' | xargs )
HTNumber=$((logicalNumber / (physicalNumber * coreNumber)))

echo "****** CPU Information ******"
echo "Logical CPU Number : ${logicalNumber}"
echo "Physical CPU Number : ${physicalNumber}"
echo "CPU Core Number : ${coreNumber}"
echo "HT Number : ${HTNumber}"

echo "*****************************"

执行结果：

#./cpuinfo
****** CPU Information ******
Logical CPU Number : 24
Physical CPU Number : 2
CPU Core Number : 6
HT Number : 2
*****************************