In the near term, we could consider tweaking the systemd-oomd defaults in Ubuntu. According to the commit that added systemd-oomd in Jammy [1], the current config is based on Fedora's. This includes using the default value of SwapUsedLimit=90% [2]. However, Fedora has more swap space by default: a fresh install of Fedora 35 in a VM with 4GB of memory has 4GB of swap, whereas a fresh install of Jammy in a VM with 4GB of memory has 968MB of swap. So, maybe the default SwapUsedLimit is not appropriate for Ubuntu.
[1] https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?h=ubuntu-jammy&id=771fee9e73316c92e065e93946ec64c578b43706 [2] https://www.freedesktop.org/software/systemd/man/oomd.conf.html#SwapUsedLimit= -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1966381 Title: applications crash that never crashed under Ubuntu-20.04 Status in systemd package in Ubuntu: New Status in systemd source package in Jammy: New Bug description: Just now I was watching some video in Firefox. I popped over to another virtual workspace for a few minutes, and when I popped back to Firefox it had gone. The same thing had been happening all week (I installed fresh Ubuntu-22.04 last week) with Chrome, Firefox and Thunderbird. This time instead of shrugging it off I looked in the logs, and found this Mar 25 19:45:40 ubuntu systemd-oomd[960]: Killed /user.slice/user-1001.slice/user@1001.service/app.slice/app-gnome-firefox-6607.scope due to memory used (15940579328) / total (16153944064) and swap used (925564928) / total (1023406080) being more than 90.00% Mar 22 08:11:29 ubuntu systemd[5029]: app-gnome-google\x2dchrome-5412.scope: systemd-oomd killed 298 process(es) in this unit. Mar 23 11:09:28 ubuntu systemd-oomd[1055]: Killed /user.slice/user-1001.slice/user@1001.service/app.slice/app-gnome-thunderbird-5418.scope due to memory used (15591993344) / total (16149745664) and swap used (927760384) / total (1023406080) being more than 90.00% Mar 23 11:09:28 ubuntu systemd[5029]: app-gnome-thunderbird-5418.scope: systemd-oomd killed 173 process(es) in this unit. I know it's saying those three entirely unrelated applications had suddenly decided to swallow all the RAM+swap on this laptop of mine - but the very same apps didn't act like that last week under Ubuntu-20.04, so I suspect something else is going on I can't say they hadn't swallowed all the RAM, but there is ZERO sign of a system on the verge of collapsing - everything has been screaming along just nicely - no sign of the "staggering" you normally get when the OS is heavily into swap. However, now that I look I see my 16G laptop only has 1G swap??? I just let the Ubuntu installer do it's defaults - but it used to auto- choose 1xRAM or 2xRAM - what's with this 1G swap? Could that be related? ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: systemd-oomd 249.11-0ubuntu1 ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27 Uname: Linux 5.15.0-23-generic x86_64 ApportVersion: 2.20.11-0ubuntu79 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Fri Mar 25 19:47:44 2022 InstallationDate: Installed on 2022-03-13 (11 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313) SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1966381/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
