Ubuntu - Swap - Recommended Swap Space

Historically, swap space was set to twice the amount of memory.

However that was against systems with very little memory.
The systems today have a lot more memory, so new rules apply as to the amount of recommended swap to have.

Amount of RAM in the system	Recommended swap space	Recommended swap space if allowing for hibernating
2GB of RAM or less	2 times the amount of RAM	3 times the amount of RAM
2GB to 8GB of RAM	Equal to the amount of RAM	2 times the amount of RAM
8GB to 64GB of RAM	0.5 times the amount of RAM	1.5 times the amount of RAM
64GB of RAM or more	4GB of swap space	No extra space needed