#!/bin/sh

CPUPATH=/sys/devices/system/cpu

MAXID=$(cat $CPUPATH/present | awk -F- '{print $NF}')

[ "$(uname -s || true)" = "Linux" ] || \

echo "Warning: This script supports Linux only." >&2

[ "$(id -u || true)" = "0" ] || \

echo "Warning: This script typically needs root access to modify CPU governor. Consider running it with sudo." >&2

get_default_governor() {

case "$(cat "$CPUPATH/cpu0/cpufreq/scaling_available_governors")" in

*"schedutil"*) echo "schedutil" ;;

*"ondemand"*) echo "ondemand" ;;

*"conservative"*) echo "conservative";;

*) echo "powersave" ;;

esac

}

set_governor() {

governor_name="$1"

echo "Setting governor for all CPU cores to \"$governor_name\"..."

i=0

while [ "$i" -le "$MAXID" ]; do

echo "$1" > "$CPUPATH/cpu$i/cpufreq/scaling_governor"

i=$((i + 1))

done

echo "Done."

}

usage() {

default_gov=$(get_default_governor)

echo "CPU Governor Management Script"

echo "----------------------------------------------------------------------------"

echo "Usage: $0 [command]"

echo

echo "Commands:"

echo " fast Sets the governor to 'performance' for maximum speed."

echo " (Warning: Increases heat/power use. Use for short-term tasks.)"

echo

echo " reset Resets the governor to the system's recommended default ('$default_gov')."

echo

echo " get Shows the current CPU governor for ALL cores."

echo "----------------------------------------------------------------------------"

}

case "$1" in

fast | performance)

echo "Warning: The 'performance' mode locks the CPU at its highest speed."

echo "It is highly recommended to 'reset' after your task is complete."

set_governor "performance"

;;

reset | default)

default_governor=$(get_default_governor)

set_governor "$default_governor"

;;

get | status)

echo "Current governor status for all cores:"

grep . "$CPUPATH"/cpu*/cpufreq/scaling_governor

;;

*)

usage

exit 1

;;

esac

exit 0