How to add swap file with cool pi 4b

[大法师]

Swap is a space on a disk that is used when the amount of physical RAM memory is full. When a Linux system runs out of RAM, inactive pages are moved from the RAM to the swap space.

Swap space can take the form of either a dedicated swap partition or a swap file. In most cases, when running Linux on a virtual machine, a swap partition is not present, so the only option is to create a swap file.

Example Add 8GB swap memory

sudo dd if=/dev/zero of=/swapfile bs=1M count=8096

sudo chmod 0600 /swapfile

sudo mkswap /swapfile 

sudo swapon /swapfile

echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab

sudo mount -a or reboot

ubuntu@ubuntu:~$ free -h
              total        used        free      shared  buff/cache   available
Mem:          3.8Gi       3.2Gi       133Mi       110Mi       458Mi       443Mi
Swap:         7.9Gi       1.0Mi       7.9Gi
ubuntu@ubuntu:~$

How to adjust the swappiness value

refer info