Skip to content

Instantly share code, notes, and snippets.

@geerlingguy
Last active November 10, 2023 11:06
  • Star 46 You must be signed in to star a gist
  • Fork 12 You must be signed in to fork a gist
Star You must be signed in to star a gist
Embed
What would you like to do?
Raspberry Pi CPU temperature and throttling test script
#!/bin/bash
# Raspberry Pi stress CPU temperature measurement script.
#
# Download this script (e.g. with wget) and give it execute permissions (chmod +x).
# Then run it with ./pi-cpu-stress.sh
# Variables.
test_run=1
test_results_file="${HOME}/cpu_temp_$test_run.log"
stress_length="10m"
# Verify stress-ng is installed.
if ! [ -x "$(command -v stress-ng)" ]; then
printf "Error: stress-ng not installed.\n"
printf "To install: sudo apt install -y stress-ng\n" >&2
exit 1
fi
printf "Logging temperature and throttling data to: $test_results_file\n"
# Start logging temperature data in the background.
while /bin/true; do
# Print the date (e.g. "Wed 13 Nov 18:24:45 GMT 2019") and a tab.
date | tr '\n' '\t' >> $test_results_file;
# Print the temperature (e.g. "39.0") and a tab.
vcgencmd measure_temp | tr -d "temp=" | tr -d "'C" | tr '\n' '\t' >> $test_results_file;
# Print the throttle status (e.g. "0x0") and a tab.
vcgencmd get_throttled | tr -d "throttled=" | tr '\n' '\t' >> $test_results_file;
# Print the current CPU frequency.
vcgencmd measure_clock arm | sed 's/^.*=//' >> $test_results_file;
sleep 5;
done &
# Store the logging pid.
PROC_ID=$!
# Stop the logging loop if script is interrupted or when it ends.
trap "kill $PROC_ID" EXIT
# After 5 minutes, run stress.
printf "Waiting 5 minutes for stable idle temperature...\n"
sleep 300
printf "Beginning $stress_length stress test...\n"
stress-ng -c 4 --timeout $stress_length
# Keep logging for 5 more minutes.
printf "Waiting 5 minutes to return to idle temperature...\n"
sleep 300
printf "Test complete.\n"
@geerlingguy
Copy link
Author

Weird! I'm surprised there would be that much of a difference. And now I'm wondering if there are multiple temperature sensors in the SoC :)

@yoyojacky
Copy link

yoyojacky commented Nov 10, 2023

I am using following script to record temperature :

from  gpiozero import CPUTemperature
from time import sleep, strftime, time

cpu = CPUTemperature()
count=1200      # 20 minutes
with open("/home/pi/temp_log.csv", "a") as  log:
    while True:
        temp = cpu.temperature
         log.write("{0},{1}".format(strftime("%Y-%m-%d %H:%M:%S"), str(temp)))
         sleep(1)
         count -= 1
         if count == 0:
             break

and using sysbench in a loop:

#!/bin/bash
while true; 
do 
     sysbench --test=cpu --cpu-max-prime=20000 --threads=4 run 
     sleep 0.1
done 

and it works fine.

@yoyojacky
Copy link

yoyojacky commented Nov 10, 2023

stess_temp
stress-temp-complete

@yoyojacky
Copy link

Question: how did you generated the images from the logging data? Is there any nice script for that?

maybe it can be plot by using matplotlib library.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment