Basically I wanted to test how fast my RPi will heat up under stress with or without heat sinks
How to perform stress test
It is easy with stress application.
sudo apt-get install stress
sudo stress --cpu 4
it will span 4 processes that will execute on each of RPi core calculating sqrt function (source).
Constantly measure CPU temperature
watch -n 1 /opt/vc/bin/vcgencmd measure_temp
This command will print cpu temperature on console each 1 second.
You can observe how 4 stress processes are utilising cpu with command:
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No heat sinks:
- idle: around 50 C
- under stress: up to 82 C
- response on air flow: low decreases maximum temperature by 2-3 C
With heat sinks:
- idle: around 44 C
- under stress: up to 77 C
- response on air flow: good decreases maximum temperature by 7-8 C
I’m a bit disappointed with those small heat sinks, expecting that they’ll lower temperatures more drastically. Using fan that will blows air on them will give better results.