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#!/bin/bash
# Usage: temp_throttle.sh max_temp
# USE CELCIUS TEMPERATURES.
cat << EOF
Author: Sepero (sepero 111 @ gmail . com)
Remote Python developer and Linux administrator for hire.
URL: http://github.com/Sepero/temp-throttle/
EOF
# Additional Links
# http://github.com/Sepero/temp-throttle/
# http://seperohacker.blogspot.com/2012/10/linux-keep-your-cpu-cool-with-frequency.html
# License: GNU GPL 2.0
# Generic function for printing an error and exiting.
function err_exit () {
echo ""
echo "Error: $@" 1>&2
exit 128
}
if [ $# -ne 1 ]; then
# If temperature wasn't given, then print a message and exit.
echo "Please supply a maximum desired temperature in Celcius." 1>&2
echo "For example: ${0} 60" 1>&2
exit 2
else
#Set the first argument as the maximum desired temperature.
MAX_TEMP=$1
fi
# The frequency will increase when low temperature is reached.
let LOW_TEMP=$MAX_TEMP-5
CORES=$(nproc) # Get number of CPU cores.
echo -e "Number of CPU cores detected: $CORES\n"
# Temperatures internally are calculated to the thousandth.
MAX_TEMP=${MAX_TEMP}000
LOW_TEMP=${LOW_TEMP}000
FREQ_FILE="/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies"
# FREQ_LIST is an array of available frequencies.
declare -a FREQ_LIST=($(cat $FREQ_FILE)) || err_exit "Could not determine available cpu frequencies. Missing file: $FREQ_FILE"
# CURRENT_FREQ will save the index of the currently used frequency in FREQ_LIST.
CURRENT_FREQ=1
# Set the maximum frequency for all cpu cores.
function set_freq {
echo ${FREQ_LIST[$1]}
for((i=0;i<$CORES;i++)); do
echo ${FREQ_LIST[$1]} > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq
done
}
# Will reduce the frequency of cpus if possible.
function throttle {
if [ $CURRENT_FREQ -ne $((${#FREQ_LIST[@]}-1)) ]; then
let CURRENT_FREQ+=1
echo -n "throttle "
set_freq $CURRENT_FREQ
fi
}
# Will increase the frequency of cpus if possible.
function unthrottle {
if [ $CURRENT_FREQ -ne 0 ]; then
let CURRENT_FREQ-=1
echo -n "unthrottle "
set_freq $CURRENT_FREQ
fi
}
function get_temp {
# Get the system temperature.
# If one of these doesn't work, the try uncommenting another.
TEMP=$(cat /sys/class/thermal/thermal_zone0/temp)
#TEMP=$(cat /sys/class/hwmon/hwmon0/temp1_input)
#TEMP=$(cat /sys/class/hwmon/hwmon1/device/temp1_input)
}
# Mainloop
while true; do
get_temp
if [ $TEMP -gt $MAX_TEMP ]; then # Throttle if too hot.
throttle
elif [ $TEMP -le $LOW_TEMP ]; then # Unthrottle if cool.
unthrottle
fi
sleep 3
done
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