The script gathers data for us by logging CPU temperature, fan frequency, and fan RPM in a file. We used gnuplot to visualize the collected data.

#!/bin/sh
# TODO: Make this more robust and less hacky.

date="$(date +"%T")"
logfile="$1-log-start-$date"

echo "Temperature,Frequency,FanRPM" > /tmp/$logfile
echo "Start recording Temperature, Frequency and FanRPM to $logfile"
echo "Press ctrl-c to close this script and stop recording."

get_thermalzones() {
  cd /sys/class/thermal/ || exit # change to dir or exit
  items=(thermal_zone*)
  amount=${#items[@]}
  echo $amount
}

thermalzones=$(get_thermalzones)

cpucount="$(lscpu  | grep "^CPU(s)" | awk '{print $2}')"

while true; do
  temptotal="$(cat /sys/class/thermal/thermal_zone*/temp | paste -sd '+' | bc)"
  # computation of thermal average
  temp=$( echo "($temptotal/$thermalzones)/1000" | bc )

  # these values are needed to calculate the average frequency of all cores
  freqtotal="$(cat /proc/cpuinfo | grep "^[c]pu MHz" | awk '{print $4}' | paste -sd '+' | bc)"

  # computation of frequency average
  freq=$( echo "$freqtotal/$cpucount" | bc )

  # Get fan's RPM
  rpm="$(cat /sys/bus/platform/devices/thinkpad_hwmon/hwmon/hwmon3/fan1_input)"

  # calcluating cpu Wattage , / 1000000000000
  #power="$( echo "$(cat /sys/class/power_supply/BAT*/current_now) * $(cat /sys/class/power_supply/BAT*/voltage_now) / 1000000000000" | bc  )"

  echo "$temp,$freq,$rpm" >> /tmp/$logfile
  sleep 1
done