compare rapl and battery charge info on Framework AMD 13 (2023 edition)

fw-amd-13-power-compare.sh

#!/bin/bash
#
# Comparing the two sources of energy usage on a framework 13 AMD edition

# tempdir=$(mktemp -d)

# cleanup() {
#     rm -rf "$tempdir"
# }

# trap cleanup EXIT

energyfile=/sys/class/powercap/intel-rapl/intel-rapl:0/energy_uj
batterychargefile=/sys/class/power_supply/BAT1/charge_now


# check permissions
if [[ ! -r $energyfile ]]; then
    echo "Cannot read $energyfile (maybe run as root)" >&2
    exit 1
fi

if [[ ! -r $batterychargefile ]]; then
    echo "Cannot read $batterychargefile (maybe run as root)" >&2
    exit 1
fi

voltageminfile=$(dirname "$batterychargefile")/voltage_min_design

if [[ ! -r $voltageminfile ]]; then
    echo "Cannot read $voltageminfile (maybe run as root)" >&2
    exit 1
fi

bat_uvolts=$(cat "$voltageminfile")

last_energy=
last_batterycharge=
battery_seconds_since_change=1
# calculate watts from joules
while true; do

    ts=$(date +%s)
    energy=$(cat "$energyfile")
    if [[ -n $last_energy ]]; then
        # convert to watts
        watts=$(echo "scale=2; ($energy - $last_energy) / 1000000" | bc)
        echo "$ts rapl: $watts W"
    fi

    batterycharge=$(cat "$batterychargefile")
    if [[ -n $last_batterycharge ]]; then
        # battery charge is in uah
        # bat_volts is in uv
        # therefore watts = (uah * uv) * 3600 / 1000000000000
        uah_change=$(echo " ($batterycharge - $last_batterycharge)" | bc)
        watts=$(echo "scale=2; ($uah_change) * $bat_uvolts *3600 / 1000000000000 / $battery_seconds_since_change" | bc)
        if [[ $uah_change -ne 0 ]]; then
            battery_seconds_since_change=1
            echo "$ts battery: $watts W"
        else
            battery_seconds_since_change=$((battery_seconds_since_change + 1))
        fi
    fi

    last_energy=$energy
    last_batterycharge=$batterycharge

    sleep 1
done