156 lines
4.6 KiB
Bash
Executable File
156 lines
4.6 KiB
Bash
Executable File
#!/bin/bash
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# Usage: temp_throttle.sh max_temp
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# USE CELSIUS TEMPERATURES.
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# version 2.21
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cat << EOF
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Author: Sepero 2016 (sepero 111 @ gmx . com)
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URL: http://github.com/Sepero/temp-throttle/
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EOF
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# Additional Links
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# http://seperohacker.blogspot.com/2012/10/linux-keep-your-cpu-cool-with-frequency.html
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# Additional Credits
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# Wolfgang Ocker <weo AT weo1 DOT de> - Patch for unspecified cpu frequencies.
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# License: GNU GPL 2.0
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# Generic function for printing an error and exiting.
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err_exit () {
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echo ""
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echo "Error: $@" 1>&2
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exit 128
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}
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if [ $# -ne 1 ]; then
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# If temperature wasn't given, then print a message and exit.
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echo "Please supply a maximum desired temperature in Celsius." 1>&2
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echo "For example: ${0} 60" 1>&2
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exit 2
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else
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#Set the first argument as the maximum desired temperature.
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MAX_TEMP=$1
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fi
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### START Initialize Global variables.
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# The frequency will increase when low temperature is reached.
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LOW_TEMP=$((MAX_TEMP - 5))
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CORES=$(nproc) # Get number of CPU cores.
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echo -e "Number of CPU cores detected: $CORES\n"
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CORES=$((CORES - 1)) # Subtract 1 from $CORES for easier counting later.
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# Temperatures internally are calculated to the thousandth.
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MAX_TEMP=${MAX_TEMP}000
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LOW_TEMP=${LOW_TEMP}000
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FREQ_FILE="/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies"
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FREQ_MIN="/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq"
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FREQ_MAX="/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"
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# Store available cpu frequencies in a space separated string FREQ_LIST.
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if [ -f $FREQ_FILE ]; then
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# If $FREQ_FILE exists, get frequencies from it.
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FREQ_LIST=$(cat $FREQ_FILE | xargs -n1 | sort -g -r | xargs) || err_exit "Could not read available cpu frequencies from file $FREQ_FILE"
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elif [ -f $FREQ_MIN -a -f $FREQ_MAX ]; then
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# Else if $FREQ_MIN and $FREQ_MAX exist, generate a list of frequencies between them.
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FREQ_LIST=$(seq $(cat $FREQ_MAX) -100000 $(cat $FREQ_MIN)) || err_exit "Could not compute available cpu frequencies"
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else
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err_exit "Could not determine available cpu frequencies"
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fi
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FREQ_LIST_LEN=$(echo $FREQ_LIST | wc -w)
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# CURRENT_FREQ will save the index of the currently used frequency in FREQ_LIST.
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CURRENT_FREQ=2
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# This is a list of possible locations to read the current system temperature.
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TEMPERATURE_FILES="
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/sys/class/thermal/thermal_zone0/temp
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/sys/class/thermal/thermal_zone1/temp
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/sys/class/thermal/thermal_zone2/temp
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/sys/class/hwmon/hwmon0/temp1_input
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/sys/class/hwmon/hwmon1/temp1_input
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/sys/class/hwmon/hwmon2/temp1_input
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/sys/class/hwmon/hwmon0/device/temp1_input
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/sys/class/hwmon/hwmon1/device/temp1_input
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/sys/class/hwmon/hwmon2/device/temp1_input
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null
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"
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# Store the first temperature location that exists in the variable TEMP_FILE.
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# The location stored in $TEMP_FILE will be used for temperature readings.
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for file in $TEMPERATURE_FILES; do
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TEMP_FILE=$file
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[ -f $TEMP_FILE ] && break
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done
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[ $TEMP_FILE == "null" ] && err_exit "The location for temperature reading was not found."
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### END Initialize Global variables.
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### START define script functions.
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# Set the maximum frequency for all cpu cores.
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set_freq () {
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# From the string FREQ_LIST, we choose the item at index CURRENT_FREQ.
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FREQ_TO_SET=$(echo $FREQ_LIST | cut -d " " -f $CURRENT_FREQ)
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echo $FREQ_TO_SET
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for i in $(seq 0 $CORES); do
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# Try to set core frequency by writing to /sys/devices.
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{ echo $FREQ_TO_SET 2> /dev/null > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq; } ||
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# Else, try to set core frequency using command cpufreq-set.
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{ cpufreq-set -c $i --max $FREQ_TO_SET > /dev/null; } ||
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# Else, return error message.
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{ err_exit "Failed to set frequency CPU core$i. Run script as Root user. Some systems may require to install the package cpufrequtils."; }
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done
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}
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# Will reduce the frequency of cpus if possible.
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throttle () {
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if [ $CURRENT_FREQ -lt $FREQ_LIST_LEN ]; then
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CURRENT_FREQ=$((CURRENT_FREQ + 1))
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echo -n "throttle "
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set_freq $CURRENT_FREQ
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fi
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}
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# Will increase the frequency of cpus if possible.
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unthrottle () {
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if [ $CURRENT_FREQ -ne 1 ]; then
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CURRENT_FREQ=$((CURRENT_FREQ - 1))
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echo -n "unthrottle "
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set_freq $CURRENT_FREQ
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fi
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}
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get_temp () {
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# Get the system temperature. Take the max of all counters
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TEMP=$(cat $TEMPERATURE_FILES 2>/dev/null | xargs -n1 | sort -g -r | head -1)
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}
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### END define script functions.
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echo "Initialize to max CPU frequency"
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unthrottle
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# Main loop
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while true; do
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get_temp # Gets the current temperature and set it to the variable TEMP.
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if [ $TEMP -gt $MAX_TEMP ]; then # Throttle if too hot.
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throttle
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elif [ $TEMP -le $LOW_TEMP ]; then # Unthrottle if cool.
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unthrottle
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fi
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sleep 3 # The amount of time between checking temperatures.
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done
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