How to create a CPU spike with a bash command
I want to create a near 100% load on a Linux machine. It's quad core system and I want all cores going full speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop.
You can also do
dd if=/dev/zero of=/dev/null
To run more of those to put load on more cores, try to fork it:
fulload() { dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null & }; fulload; read; killall dd
Repeat the command in the curly brackets as many times as the number of threads you want to produce (here 4 threads). Simple enter hit will stop it (just make sure no other dd is running on this user or you kill it too).
I use stress for this kind of thing, you can tell it how many cores to max out.. it allows for stressing memory and disk as well.
Example to stress 2 cores for 60 seconds
stress --cpu 2 --timeout 60
I think this one is more simpler. Open Terminal and type the following and press Enter.
yes > /dev/null &
To fully utilize modern CPUs, one line is not enough, you may need to repeat the command to exhaust all the CPU power.
To end all of this, simply put
killall yes
The idea was originally found here, although it was intended for Mac users, but this should work for *nix as well.
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