How does VPS use swap RAM?
In various VPSes I have, there are two methods for using swap memory (when checking by free command).
Using swap memory only when my dedicated RAM is fully used, and out of memory.
Swap memory is always used alongside with the dedicated RAM.
What is the difference of these two methods? and why providers prefer one to another. The first one is more logical to me, but in some VPSes, I see the second method.