#!/bin/bash
# Get cpu topology

system=$(uname -s)
if [ "$system" != "Linux" ]; then
  echo "This script only running on Linux"
  exit 1
fi

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 

