查看Linux cpu信息

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在linux系统下可以通过cat /proc/cpuinfo来查看本机上cpu的相关信息,通过processor可以判断逻辑cpu的个数,physical id可以判断物理cpu的个数,通过cpu cores来判断每个cpu内的核数,通过siblings和cpu cores的对比可以判断是否支持超线程。
    [oracle@sany1 ~]$ cat /proc/cpuinfo |grep processor|wc -l
    32
    通过以上命令可以判断本机内的逻辑cpu个数为32
    [oracle@sany1 ~]$ cat /proc/cpuinfo |grep physical\ id|sort|uniq
    physical id     : 0
    physical id     : 1
    通过以上输出可以判断本机内物理cpu个数为2
    [oracle@sany1 ~]$ cat /proc/cpuinfo |grep cpu\ cores|uniq
    cpu cores       : 8
    通过以上输出可以判断单个cpu的核数为8
    [root@sany1 ~]# cat /proc/cpuinfo |grep sibling|uniq
    siblings        : 16
    通过以上输出的结果以及与cpu cores的比较可以确定本机支持超线程。

从以上结果我们最终可以确定本机上拥有2个物理cpu,每个cpu上有8个核，每个核上支持2个线程，从操作系统上通过top或者mpstat等监控命令可以看到有32个逻辑cpu。

写成脚本如下：

#!/bin/bash# Simple print cpu topology# Author: kodangofunction get_nr_processor(){    grep '^processor' /proc/cpuinfo | wc -l}function get_nr_socket(){    grep 'physical id' /proc/cpuinfo | awk -F: '{            print $2 | "sort -un"}' | wc -l}function get_nr_siblings(){    grep 'siblings' /proc/cpuinfo | awk -F: '{            print $2 | "sort -un"}'}function get_nr_cores_of_socket(){    grep 'cpu cores' /proc/cpuinfo | awk -F: '{            print $2 | "sort -un"}'}echo '===== CPU Topology Table ====='echoecho '+--------------+---------+-----------+'echo '| Processor ID | Core ID | Socket ID |'echo '+--------------+---------+-----------+'while read line; do    if [ -z "$line" ]; then        printf '| %-12s | %-7s | %-9s |\n' $p_id $c_id $s_id        echo '+--------------+---------+-----------+'        continue    fi    if echo "$line" | grep -q "^processor"; then        p_id=`echo "$line" | awk -F: '{print $2}' | tr -d ' '`     fi    if echo "$line" | grep -q "^core id"; then        c_id=`echo "$line" | awk -F: '{print $2}' | tr -d ' '`     fi    if echo "$line" | grep -q "^physical id"; then        s_id=`echo "$line" | awk -F: '{print $2}' | tr -d ' '`     fidone < /proc/cpuinfoechoawk -F: '{     if ($1 ~ /processor/) {        gsub(/ /,"",$2);        p_id=$2;    } else if ($1 ~ /physical id/){        gsub(/ /,"",$2);        s_id=$2;        arr[s_id]=arr[s_id] " " p_id    }} END{    for (i in arr)         printf "Socket %s:%s\n", i, arr[i];}' /proc/cpuinfoechoecho '===== CPU Info Summary ====='echonr_processor=`get_nr_processor`echo "Logical processors: $nr_processor"nr_socket=`get_nr_socket`echo "Physical socket: $nr_socket"nr_siblings=`get_nr_siblings`echo "Siblings in one socket: $nr_siblings"nr_cores=`get_nr_cores_of_socket`echo "Cores in one socket: $nr_cores"let nr_cores*=nr_socketecho "Cores in total: $nr_cores"if [ "$nr_cores" = "$nr_processor" ]; then    echo "Hyper-Threading: off"else    echo "Hyper-Threading: on"fiechoecho '===== END ====='

参考资料:

http://www.qingran.net/2011/09/numa%E5%BE%AE%E6%9E%B6%E6%9E%84/

http://www.searchtb.com/2012/12/%E7%8E%A9%E8%BD%ACcpu-topology.html

http://kodango.com/cpu-topology

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