I've searched the net and came across the Ubuntu wiki saying
stress-ng --matrix 0
is supposed the best. But there are dedicated stressors for CPU and RAM (looking at man).
Any ideas which one is the best to use? Thank you
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You can install
sudo apt install stress
Then call it with:
stress --cpu 8 --io 4 --vm 4 --vm-bytes 1024M --timeout 10s
On my conky display notice how:
stress --help for a full list of options.
A commentator requested posting the entire conky script which I did here: conky transparent