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  • linux查询cpu核心数

    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
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  • 原文地址:https://www.cnblogs.com/Rozdy/p/4969444.html
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