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How to set the swappiness value?

Swappiness in the file should be set to 10. Skipping this step may cause poor performance, whereas setting it to 10 will cause a swap which  act as an emergency buffer, preventing out-of-memory crashes.

You can do this with the following commands:

echo 10 | sudo tee /proc/sys/vm/swappiness

echo vm.swappiness = 10 | sudo tee -a /etc/sysctl.conf