查看Linux cpu信息

在linux系統下可以通過cat /proc/cpuinfo來查看本機上cpu的相關信息,通過processor可以判斷邏輯cpu的個數,physical id可以判斷物理cpu的個數,通過cpu cores來判斷每個cpu內的核數,通過siblings和cpu cores的對比可以判斷是否支持超線程。
[test@hash1 ~]$ cat /proc/cpuinfo |grep processor|wc -l
32
通過以上命令可以判斷本機內的邏輯cpu個數為32
[test@hash1 ~]$ cat /proc/cpuinfo |grep physical\ id|sort|uniq
physical id : 0
physical id : 1
通過以上輸出可以判斷本機內物理cpu個數為2
[test@hash1 ~]$ cat /proc/cpuinfo |grep cpu\ cores|uniq
cpu cores : 8
通過以上輸出可以判斷單個cpu的核數為8
[root@hash1 ~]# cat /proc/cpuinfo |grep sibling|uniq
siblings : 16
通過以上輸出的結果以及與cpu cores的比較可以確定本機支持超線程。
從以上結果我們最終可以確定本機上擁有2個物理cpu,每個cpu上有8個核，每個核上支持2個線程，從操作系統上通過top或者mpstat等監控命令可以看到有32個邏輯cpu。寫成腳本如下：

#!/bin/bash  
  
# Simple print cpu topology  
# Author: hashlinux  
  
function 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 ====='  
echo  
  
echo '+--------------+---------+-----------+'  
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 ' '`   
    fi  
done < /proc/cpuinfo  
  
echo  
  
awk -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/cpuinfo  
  
echo  
echo '===== CPU Info Summary ====='  
echo  
  
nr_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_socket  
echo "Cores in total: $nr_cores"  
  
if [ "$nr_cores" = "$nr_processor" ]; then  
    echo "Hyper-Threading: off"  
else  
    echo "Hyper-Threading: on"  
fi  
  
echo  
echo '===== END ====='

參考資料: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.htmlhttp://kodango.com/cpu-topology
本文出自 “江湖笑笑生” 博客，請務必保留此出處http://hashlinux.blog.51cto.com/9647696/1792411