sudo fallocate -l 8G /swapfile
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon

sudo swapoff /swapfile
sudo rm -f /swapfile

total        used        free      shared  buff/cache   available
Mem:           7.7G        301M        7.1G        720K        285M        7.2G
Swap:            0B          0B          0B