Kamil Paral wrote on Wed, Jul 08, 2020: > On Wed, Jul 8, 2020 at 8:26 AM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > > D. Which directories? Some may be outside of the installer's scope. > > > > /usr > > /var/lib/flatpak > > ~/.local/share/flatpak > > I have a concern regarding games. Currently, we have a few a bit more > demanding titles on Flathub already, like 0AD, Xonotic or Albion Online. In > the glorious future (tm) we might get more. Games are very sensitive to > available CPU cycles and context switching and usually come with their data > files already compressed. Including the btrfs compression by default on > flatpak dirs could lead to lowered performance whenever the game tries to > load some assets (older titles do that during the loading screen, newer > titles stream new assets constantly during gameplay and any slowdown > manifests as game stuttering). Please test, but if a file is deemed not compressible (based on, not sure what? the first few blocks?) then it will be stored in the non-compressed version. You can check with compsize after the fact if the file had been compressed or not. This should be true unless the compress-force mount option is used, even the chattr is only a hint > I'm personally more concerned about reduced performance in e.g. my web > browser than disk wear out. I don't see much harm in compressing /usr, > because it's a read-only location that gets loaded once when the app starts > (it might delay the app startup a bit, though, and decrease the perceived > snappiness of the desktop). But I'm concerned about compressing locations > which are hit often, like ~/.var or ~/.cache. I've had my 120GB SSD for 5 > years and I'm just at 10% of expected TBW (total bytes written). If the SSD > lasts 50 or 100 years is not really important for me, but the desktop and > app responsiveness is (and game performance, of course:)). I think write > amplification is a problem specific to devices with SD cards, and for > anyone else, it might be better to leave it unset and let people enable it > (it's simple) if they want it for their use case. This obviously needs testing on a wide variety of hardware but I haven't noticed any difference in the feeling on an intel laptop (kabylake i5 throttled at 2GHz) ; that being said firefox isn't the most responsive app in my book... -- Dominique _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx 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/devel@xxxxxxxxxxxxxxxxxxxxxxx
