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    Call for testing: OOM adjustment changes

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    • fredldotmeF
      fredldotme
      last edited by fredldotme

      TL;DR: Please run sudo ubports-qa install xenial_-_multiproclockup and report on applications not being killed at the wrong time.

      The OOM (Out-Of-Memory) adjustment helper is one component used to tell the kernel about which applications to rank lower and higher for killing when RAM runs out.
      This mechanism used to be implemented as a setuid program, which is slow and takes a long time for web applications and browser to succeed. It shows for example on the Xperia X when switching between applications, for example a browser window and a single-process application like System Settings.

      In this PR (https://github.com/ubports/ubuntu-app-launch/pull/16) I've implemented the privileged OOM adjustment helper as a DBus-activated service, which means it is running in the background and taking commands over DBus, being much faster at handling lots of processes.

      In case you want to help:

      • Make sure your device is on the devel channel
      • Mount a tmpfs so apt can breathe: sudo mount -t tmpfs tmpfs /var/cache/apt/archives
      • Use sudo ubports-qa install xenial_-_multiproclockup to install the necessary packages
      • Reboot
      • Test which applications get killed first by the system

      As a general rule, the topmost app should never be touched when killing due to hitting RAM limits.

      Memories are just what the mind tells us about our actions.

      1 Reply Last reply Reply Quote 2
      • S
        status_active
        last edited by

        Steps followed on Nexus 5 but after rebooting it gets stuck on booting logo. 😞

        fredldotmeF 1 Reply Last reply Reply Quote 0
        • fredldotmeF
          fredldotme @status_active
          last edited by fredldotme

          @status_active that is odd. Do you have other ubports-qa repos active as well? And do you have developer mode active? Maybe we can debug it through adb. Also, are you running the devel channel?

          Memories are just what the mind tells us about our actions.

          S 1 Reply Last reply Reply Quote 0
          • S
            status_active @fredldotme
            last edited by

            @fredldotme No ubports-qa active.
            I'm not running devel channel, should I?
            No Developer mode active.

            Sorry,I don't know what I'm doing 😞 further instructions will be appreciated.

            fredldotmeF 1 Reply Last reply Reply Quote 0
            • fredldotmeF
              fredldotme @status_active
              last edited by

              @status_active If you want to continue helping: You can switch to the development channel via the Updates menu in the System Settings app. You will have to rerun the commands in the first post again after that.

              Memories are just what the mind tells us about our actions.

              1 Reply Last reply Reply Quote 0
              • S
                status_active
                last edited by status_active

                Ok, reflashing now.Developer Mode should be active?

                fredldotmeF 1 Reply Last reply Reply Quote 0
                • fredldotmeF
                  fredldotme @status_active
                  last edited by

                  @status_active Just in case the startup fails again, we might need something to get information from.

                  Memories are just what the mind tells us about our actions.

                  1 Reply Last reply Reply Quote 0
                  • S
                    status_active
                    last edited by

                    Oook, now it's working. March 8th update were installed too

                    fredldotmeF 1 Reply Last reply Reply Quote 0
                    • fredldotmeF
                      fredldotme @status_active
                      last edited by

                      @status_active Awesome! 🙂

                      Memories are just what the mind tells us about our actions.

                      S 1 Reply Last reply Reply Quote 0
                      • S
                        status_active @fredldotme
                        last edited by status_active

                        @fredldotme Now, should I open as much apps as I can and take a look at them on the Terminal using TOP?

                        fredldotmeF 1 Reply Last reply Reply Quote 0
                        • fredldotmeF
                          fredldotme @status_active
                          last edited by

                          @status_active Opening as many apps as possible is a good start. What shouldn't happen is that the topmost application gets killed before the others.

                          Memories are just what the mind tells us about our actions.

                          K 1 Reply Last reply Reply Quote 0
                          • K
                            kugiigi @fredldotme
                            last edited by

                            @fredldotme Topmost application meaning the current active or foreground app?

                            AppLeeA 1 Reply Last reply Reply Quote 0
                            • AppLeeA
                              AppLee @kugiigi
                              last edited by

                              @kugiigi I would say the most memory consuming app

                              1 Reply Last reply Reply Quote 0
                              • joniusJ
                                jonius
                                last edited by

                                With this change switching between apps is much snappier. I couldn't find any regressions.

                                1 Reply Last reply Reply Quote 0
                                • S
                                  status_active
                                  last edited by

                                  I agree.No issues at all when switching between apps

                                  1 Reply Last reply Reply Quote 0
                                  • mihaelM
                                    mihael
                                    last edited by

                                    Can this be installed on rc channel?

                                    fredldotmeF 1 Reply Last reply Reply Quote 0
                                    • fredldotmeF
                                      fredldotme @mihael
                                      last edited by

                                      @mihael you can try but it's untested. As of now rc should roughly match what devel pprovides

                                      Memories are just what the mind tells us about our actions.

                                      1 Reply Last reply Reply Quote 0
                                      • mihaelM
                                        mihael
                                        last edited by

                                        Is this something that in the end (after tests) will land in the image?

                                        fredldotmeF 1 Reply Last reply Reply Quote 0
                                        • fredldotmeF
                                          fredldotme @mihael
                                          last edited by

                                          @mihael hopefully

                                          Memories are just what the mind tells us about our actions.

                                          1 Reply Last reply Reply Quote 0
                                          • mihaelM
                                            mihael
                                            last edited by

                                            And how would you describe the benefits of this chage?

                                            fredldotmeF 1 Reply Last reply Reply Quote 0
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