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In this tip we will see how to turn off a CPU core under Ubuntu/Debian. This tip is very useful for users of laptops and netbooks because disabling a CPU core will help you gain more minutes by extending your battery life.

This tip is for systems with multi-core processors. To check information about your CPU, run this command from the Terminal:

cat /proc/cpuinfo

To disable a CPU core, run now this command:

echo 0 | sudo tee /sys/devices/system/cpu/cpu1/online

To enable it, use this command:

echo 1 | sudo tee /sys/devices/system/cpu/cpu1/online

That's it!

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