CentOS 7.6查看CPU信息

Physical id     #相同表示为同一个物理CPU
Processor     #逻辑CPU
Cpu cores     #CPU核数，内核个数
Core id     #内核id号
Siblings     #每个物理CPU里面的逻辑CPU个数

• 查看CPU型号

[root@localhost ~]# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c
      8  Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
[root@localhost ~]# 

• 查看物理CPU个数

[root@localhost ~]# cat /proc/cpuinfo | grep "physical id" | sort -u | wc -l 
8
[root@localhost ~]# 

• 查看逻辑CPU个数

[root@localhost ~]# cat /proc/cpuinfo | grep "processor" | wc -l  
8
[root@localhost ~]# 

• 查看CPU内核数

[root@localhost ~]# cat /proc/cpuinfo | grep "cpu cores" | uniq  
cpu cores       : 1
[root@localhost ~]# 

• 查看单个物理CPU封装的逻辑CPU数量

[root@localhost ~]# cat /proc/cpuinfo | grep "siblings" | uniq
siblings        : 1
[root@localhost ~]# 

• 计算是否开启超线程

逻辑CPU > 物理CPU x CPU核数 #开启超线程
逻辑CPU = 物理CPU x CPU核数 #没有开启超线程或不支持超线程

• 查看是否超线程

[root@localhost ~]# cat /proc/cpuinfo | grep -e "cpu cores"  -e "siblings" | sort | uniq
cpu cores       : 1
siblings        : 1
[root@localhost ~]# 

说明：如果cpu cores数量和siblings数量一致，则没有启用超线程，否则超线程被启用。

• 脚本

[root@localhost sh]# vi cpu.sh   
#!/bin/bash
cpuname=$(cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c)
physical=$(cat /proc/cpuinfo | grep "physical id" | sort -u | wc -l)
processor=$(cat /proc/cpuinfo | grep "processor" | wc -l)
cpucores=$(cat /proc/cpuinfo  | grep "cpu cores" | uniq)
siblings=$(cat /proc/cpuinfo  | grep "siblings"  | uniq)

echo "* * * * * CPU Information * * * * *"
echo "（CPU型号）cpu name : $cpuname"
echo "（物理CPU个数）physical id is : $physical"
echo "（逻辑CPU个数）processor is : $processor"
echo "（CPU内核数）cpu cores is : $cpucores"
echo "（单个物理CPU的逻辑CPU数）siblings is : $siblings"
[root@localhost sh]# 

• 脚本运行效果

[root@localhost sh]# sh cpu.sh 
* * * * * CPU Information * * * * *
（CPU型号）cpu name :       8  Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
（物理CPU个数）physical id is : 8
（逻辑CPU个数）processor is : 8
（CPU内核数）cpu cores is : cpu cores   : 1
（单个物理CPU的逻辑CPU数）siblings is : siblings        : 1
[root@localhost sh]# 

• 查看系统是多少位

[root@localhost sh]# uname -a
Linux localhost.localdomain 3.10.0-957.el7.x86_64 #1 SMP Thu Nov 8 23:39:32 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost sh]# 

说明：i386 i686为32位；x86_64为64位