linux怎么查询cpu核心数

1.查看逻辑CPU个数：

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

24

2.由于有超线程技术有必要查看一下物理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

相关知识延伸阅读：

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

安装后用lscpu可以很方便的得到:

$ lscpu | grep -E ' Thread| Core| Socket| CPU('

CPU(s): 56

Thread(s) per core: 2

Core(s) per socket: 14

Socket(s): 2

其中socket代表物理cpu个数, Core(s) per socket就是每个cpu多少核,Thread(s) per core就是每个核几个超线程

CPUs = Threads per core X cores per socket X sockets

引用:

https://unix.stackexchange.com/questions/218074/how-to-know-number-of-cores-of-a-system-in-linux

查看linux系统cpu最高几盒，可以试试以下方法：

几个cpu

more /proc/cpuinfo |grep “physical id”|uniq|wc -l

每个cpu是几核（假设cpu配置相同）

more /proc/cpuinfo |grep “physical id”|grep “0”|wc -l

cat /proc/cpuinfo | grep processor

1. 查看物理CPU的个数

#cat /proc/cpuinfo |grep “physical id”|sort |uniq|wc -l

2. 查看逻辑CPU的个数

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

3. 查看CPU是几核

#cat /proc/cpuinfo |grep “cores”|uniq

4. 查看CPU的主频

#cat /proc/cpuinfo |grep MHz|uniq

# uname -a

Linux euis1 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux

(查看当前 *** 作系统内核信息)

# cat /etc/issue | grep Linux

Red Hat Enterprise Linux AS release 4 (Nahant Update 5)

(查看当前 *** 作系统发行版信息)

# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c

8 Intel(R) Xeon(R) CPUE5410 @ 2.33GHz

(看到有8个逻辑CPU, 也知道了CPU型号)

# cat /proc/cpuinfo | grep physical | uniq -c

4 physical id : 0

4 physical id : 1

(说明实际上是两颗4核的CPU)

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