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WRT the pinebook, i didnt know it could do that. can it be done at runtime or do you have to change it at boot time?

They can be onlined or offlined at any time,

To offline a core:

echo 0 > /sys/devices/system/cpu/cpuN/online

To online a core:

echo 1 > /sys/devices/system/cpu/cpuN/online

Where cpuN is 0-4. Keep in mind there's always one core you cannot disable to process interrupts.

Very cool, thank you.

That sounds awesome. Sounds really fun to hack around. I might buy a Pinebook