Confirm the current swap file status
==========================
pi@raspberrypi ~ $ swapon -s
Filename Type Size Used Priority
/var/swap file 102396 0 -1
Stop dphys-swapfile
==========================
pi@raspberrypi ~ $ sudo /etc/init.d/dphys-swapfile stop
Stopping dphys-swapfile swapfile setup ..., done.
Modify dphys-swapfile conf File
==========================
Change the value of CONF_SWAPSIZE (in MB) (e.g. 1GB)
pi@raspberrypi ~ $ sudo vi /etc/dphys-swapfile
CONF_SWAPSIZE=1024
Start dphys-swapfile
===========================
pi@raspberrypi ~ $ sudo /etc/init.d/dphys-swapfile start
Starting dphys-swapfile swapfile setup ...
want /var/swap=1024MByte, checking existing: deleting wrong size file (104857600), generating swapfile ... of 1024MBytes
done.
Confirm the increased swap file
===========================
pi@raspberrypi ~ $ swapon -s
Filename Type Size Used Priority
/var/swap file 1048572 0 -1
Confirm by meminfo
===========================
pi@raspberrypi ~ $ cat /proc/meminfo
MemTotal: 497764 kB
MemFree: 361356 kB
...
SwapTotal: 1048572 kB
SwapFree: 1048572 kB
...