sudo swapon --show

sudo fallocate -l 1G /swapfile

sudo chmod 600 /swapfile        # sets the file to be owned by root
sudo mkswap /swapfile           # mkswap tool to allocate swap in the file
sudo swapon /swapfile           # activate the swap
sudo nano /etc/fstab            # open the file to make changes permanent

sudo swapon --show              # show if its working
sudo free -h                    # show Memory and Swap

sudo swapoff -v /swapfile

sudo rm /swapfile         # remove the swap file

RAM       No hibernation    With Hibernation   Maximum

    1GB              1GB                 2GB        2GB
    2GB              1GB                 3GB        4GB
    3GB              2GB                 5GB        6GB
    4GB              2GB                 6GB        8GB
    5GB              2GB                 7GB       10GB
    6GB              2GB                 8GB       12GB
    8GB              3GB                11GB       16GB
   12GB              3GB                15GB       24GB
   16GB              4GB                20GB       32GB
   24GB              5GB                29GB       48GB
   32GB              6GB                38GB       64GB
   64GB              8GB                72GB      128GB
  128GB             11GB               139GB      256GB
  256GB             16GB               272GB      512GB
  512GB             23GB               535GB        1TB
    1TB             32GB              1056GB        2TB
    2TB             46GB              2094GB        4TB
    4TB             64GB              4160GB        8TB
    8TB             91GB              8283GB       16TB