In UNIX environment we have swap partition that used as virtual memory. Beside dedicated swap partition, we can add certain file as swap area. Below is the example how to add a file as additional swap area in Ubuntu Linux :
tedy@satekambing:~$ sudo dd if=/dev/zero of=/SWAP.img bs=1M count=128 128+0 records in 128+0 records out 134217728 bytes (134 MB) copied, 1.24483 s, 108 MB/s tedy@satekambing:~$ sudo losetup /dev/loop7 /SWAP.img tedy@satekambing:~$ sudo mkswap /dev/loop7 Setting up swapspace version 1, size = 131068 KiB no label, UUID=db4ead3d-72d8-4fcd-97e1-7ace5ad55275 tedy@satekambing:~$ sudo swapon /dev/loop7 tedy@satekambing:~$
If you login as root then the command will be like this :
# dd if=/dev/zero of=/SWAP.img bs=1M count=128 # losetup /dev/loop7 /SWAP.img # mkswap /dev/loop7 # swapon /dev/loop7