this post was submitted on 05 Dec 2023
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You don't need it, but a gig of disk space is basically free, so why not? Swap is generally a good thing.
The core difference is that with swap when the system needs more RAM the kernel has a choice between A) Evicting pages from the disk cache or B) Swapping out anonymous data (memory not backed by a file). If you don't have swap the choice is limited to just A. (There are a few other ways to reclaim RAM but these are the biggest two). The means that with swap you will see thrashing if your whole working set doesn't fit in ram, without swap you will see thrashing if all anonymous memory + the rest of your working set doesn't fit into RAM. Basically having no swap pins all anonymous memory in RAM, even if it isn't being used. In most cases it is better to give the kernel more choices, because swapping out some background process that has been sleeping for the last 2h and will probably sleep for another 2 is much better than evicting a page of an active application from the disk cache (that will need to be read back soon).