cpufreq

#!/bin/sh
# License: MIT or GPL-2.0-or-later
# Copyright (c) 2020 Clément Péron <peron.clem@gmail.com>
set -e

# Time in seconds
TIME_MIN=10
TIME_MAX=100
TIME_DELTA=$((TIME_MAX - TIME_MIN))

# CPU Freq folder
CPU0FREQ="/sys/devices/system/cpu/cpu0/cpufreq"
CPUTEMP="/sys/class/thermal/thermal_zone0/temp"

FREQUENCIES=$(cat "${CPU0FREQ}/scaling_available_frequencies")

set_frequency_and_wait()
{
	FREQUENCY=${1}
	TIME=${2}

	echo "Frequency:${FREQUENCY}Hz Time:${TIME}s"
	echo userspace > ${CPU0FREQ}/scaling_governor
	echo "${FREQUENCY}" > "${CPU0FREQ}/scaling_setspeed"

	sleep ${TIME}
}

get_frequency()
{
	INDEX=${1}

	set -- ${FREQUENCIES}
	shift ${INDEX}

	echo ${1}
}

echo "Frequencies: ${FREQUENCIES}"

# Count number of FREQUENCIES
FREQUENCIES_SIZE=0
set -- ${FREQUENCIES}
while [ -n "$1" ]; do
	FREQUENCIES_SIZE=$((FREQUENCIES_SIZE+1))
	shift
done
echo "Number of frequencies available: ${FREQUENCIES_SIZE}"

echo "Testing all frequencies in ascending order"
i=0
while [ $i -lt ${FREQUENCIES_SIZE} ]; do
	FREQUENCY=$(get_frequency ${i})
	TIME=1
	
	set_frequency_and_wait ${FREQUENCY} ${TIME_MIN}
	i=$((i+1))
done

echo "Testing all frequencies in descending order"
i=0
while [ $i -lt ${FREQUENCIES_SIZE} ]; do
	INDEX=$((FREQUENCIES_SIZE - (i + 1)))
	FREQUENCY=$(get_frequency ${INDEX})
	TIME=1
	
	set_frequency_and_wait ${FREQUENCY} ${TIME_MIN}
	i=$((i+1))
done

echo "Testing 10 bumps from min to max frequencies"
FREQUENCY_MIN=$(get_frequency 0)
FREQUENCY_MAX=$(get_frequency $((FREQUENCIES_SIZE - 1)))
TIME=1
i=0
while [ $i -lt 10 ]; do
	set_frequency_and_wait ${FREQUENCY_MIN} ${TIME_MIN}
	set_frequency_and_wait ${FREQUENCY_MAX} ${TIME_MIN}
	i=$((i+1))
done

while true; do
	set -- ${FREQUENCIES}
	# Choose a random number between 0 and Frequencies_size - 1.
	RAND=$((RANDOM % FREQUENCIES_SIZE))
	shift ${RAND}
	FREQUENCY=${1}
	# Choose a random time
	TIME=$(($((RANDOM % TIME_DELTA)) + TIME_MIN))

	set_frequency_and_wait ${FREQUENCY} ${TIME}
done