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。
[[email protected] ~]$ 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
[[email protected] ~]$ 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
[[email protected] ~]$ 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
[[email protected] ~]# 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: 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 =====‘
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