no_hyperthread.sh

#!/bin/bash
 
# DISCLAIMER: 
# Script taken from http://askubuntu.com/questions/201937/ubuntu-detect-4-cpus-and-i-have-only-2-cpus
 
 
echo "Disabling hyperthreading..."
 
CPUS_TO_SKIP=" $(cat /sys/devices/system/cpu/cpu*/topology/thread_siblings_list | sed 's/[^0-9].*//' | sort | uniq | tr "\r\n" "  ") "
 
# Disable Hyperthreading
for CPU_PATH in /sys/devices/system/cpu/cpu[0-9]*; do
        CPU="$(echo $CPU_PATH | tr -cd "0-9")"
        echo "$CPUS_TO_SKIP" | grep " $CPU " > /dev/null
        if [ $? -ne 0 ]; then
            echo 0 > $CPU_PATH/online
        fi
done                                                                                                                                                                                            
 
lscpu | grep -i -E  "^CPU\(s\):|core|socket"