Linux查看CPU信息詳解

Linux查看CPU信息

首先，大家如果看到有什麼不懂的地方，歡迎吐槽！！！

參數說明：

• Physical id 相同表示為同一個物理CPU
• Processor 表示邏輯CPU
• Cpu cores CPU核數，內核個數
• Core id 內核id號
• Siblings 每個物理CPU裡面的邏輯CPU個數

物理CPU 兩個

processor  0      processor  2       processor   4          processor   6
core id    0      core id    2       core id     1          core id     3
physical   0      physical   0       physical    0          physical    0
cpu cores  4      cpu cores  4       cpu cores   4          cpu cores   4
siblings   4      siblings   4        siblings   4          siblings    4

processor  1      processor  3       processor   5          processor   7
core id    0      core id    2       core id     1          core id     3
physical   1      physical   1       physical    1          physical    1
cpu cores  4      cpu cores  4       cpu cores   4          cpu cores   4
siblings   4      siblings   4       siblings   4           siblings    4

計算是否開啟超線程

邏輯CPU  >  物理CPU  x   CPU核數  #開啟超線程
邏輯CPU  =  物理CPU  x   CPU核數  #沒有開啟超線程或不支持超線程

查看物理CPU個數

cat /proc/cpuinfo | grep “physical id” | sort -u | wc -l
2

查看邏輯CPU個數

cat /proc/cpuinfo | grep “processor” | wc -l
8

查看CPU內核數

cat /proc/cpuinfo | grep “cpu cores” | uniq
4

查看單個物理CPU封裝的邏輯CPU數量

cat /proc/cpuinfo | grep “siblings” | uniq
4

script查看CPU信息

#!/bin/bash

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 is a : * * * * *"
echo "physical id is a : $physical"
echo "processor is a   : $processor"
echo "cpu cores is a   : $cpucores"
echo "siblings is a    : $siblings"

判斷CPU是32位的還是64位的

cat　/proc/cpuinfo | grep lm 
8 flags     : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx tm2 ssse3 cx16 xtpr pdcm dca sse4_1 xsave lahf_lm dts tpr_shadow vnmi flexpriority
lm 表示Long Mode - 64位CPU

判斷系統是32位的還是64位的

uname -a 
i386  i686 代表32位操作系統
X86_64     代表64位操作系統