On Sat, Dec 5, 2020 at 10:03 PM Tim via users <users@lists.fedoraproject.org> wrote: > > On Sat, 2020-12-05 at 17:45 -0700, Chris Murphy wrote: > > There definitely is no free lunch with swap-on-zram, but it helps > > quite a lot for most workloads. > > I'm curious how dedicating some of your RAM for swap, therefore having > less RAM, is more beneficial than just using your RAM as RAM.
https://fedoraproject.org/wiki/Changes/SwapOnZRAM#Detailed_Description Let me know if you have questions not answered there. A key point is this is not a preallocation. Creating a 4G /dev/zram0 device doesn't reserve or consume 4G. It's dynamically allocated, and even once full it's not using that amount of memory, instead actual memory consumed is related to the compression ratio achieved. Typical is 1 to 1.5G memory consumption to swap out 4G worth of pages, for a net gain of 2.5G - 3G memory for use by other programs. And without having to write to disk at all. Not perfect, and not magic. It does have some tradeoffs. -- Chris Murphy _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org
