Raspberry Pi Cooling Test

pi-cooling.sh

#!/usr/bin/env bash

# A script to test the cooling performance of a RaspberryPi using `sysbench`
# Starts a syncbench process in the background and monitors the temperature.
#
# After the benchmark is complete, keeps the monitoring on to see how much time
# does the colling setup take to reach 55°C.

log () {
    echo "$(date -Is)" $@
}
SECONDS=0

log "Starting benchmark..."
log $(vcgencmd measure_temp | cut -d '=' -f 2)
sysbench cpu --threads=4 --events=200000 --time=0 --cpu-max-prime=100000 run &
pid=$!

# Kill the sysbench when interrupted.
trap "jobs -p | xargs -r kill &> /dev/null" EXIT

while kill -0 $pid 2> /dev/null || test $(vcgencmd measure_temp | grep -Eo '[0-9]+' | head -1) -gt 56; do
    log $(vcgencmd measure_temp) $(vcgencmd get_throttled)
    sleep 2
done

duration=$SECONDS
echo "$(($duration / 60)) minutes and $(($duration % 60)) seconds elapsed."

log "...Done!"