Answer / vishalr

Swap space in Linux is used when the amount of physical
memory (RAM) is full. If the system needs more memory
resources and the physical memory is full, inactive pages
in memory are moved to the swap space. While swap space can
help machines with a small amount of RAM, it should not be
considered a replacement for more RAM. Swap space is
located on hard drives, which have a slower access time
than physical memory.

Swap space can be a dedicated swap partition (recommended),
a swap file, or a combination of swap partitions and swap
files.

The size of your swap space should be equal to twice your
computer's RAM, or 32 MB, whichever amount is larger, but
no more than 2048 MB (or 2 GB)

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