linux 下查看机器是cpu是几核的
    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

    查看系统版本
    cat /etc/redhat-release

    查看内存
    free -m

    cpuinfo中cpu core是核心个数
    siblings是线程个数

    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