Swappiness controls the tendancy the kernel wishes to swap.
Even with free memory the kernel may swap.
100 means aggressively swap 3 means wait until the last minute to swap
To check current swappiness
cat /proc/sys/vm/swappiness
To change it live
sudo sysctl vm.swappiness=3
To change it after reboot
sudo vim /etc/sysctl.conf
Change the value of
vm.swappiness if it doesn't exist then add it to the bottom:vm.swappiness=3
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