This guide concerns swap on Serveur Cloud.

Swap and RAM

There can be swap even when RAM usage is low. Indeed, the system can use swap at any time if it deems it useful.

Swap is not a dedicated memory space to be used only when there is no free RAM, although that is often its main use.

If you want to know more, there is a parameter "swappiness" that allows you to define how the system will use the swap. The default value is 60 and it cannot be changed.