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The cores are detected by finding the directories of the form '/sys/devices/system/cpu/cpu<n>', where <n> is a positive integer. To activate (resp. deactivate) them, it sets '/sys/devices/system/cpu/cpu<n>/online' to `1` (resp. `0`). The cpu0 cannot be deactivated.
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Control linux CPUs via the CLI.
Cores can be: