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    Call for testing: OOM adjustment changes

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    • fredldotme
      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.

      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. 😞

        fredldotme 1 Reply Last reply Reply Quote 0
        • fredldotme
          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?

          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.

            fredldotme 1 Reply Last reply Reply Quote 0
            • fredldotme
              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.

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

                Ok, reflashing now.Developer Mode should be active?

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

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

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

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

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

                      @status_active Awesome! 🙂

                      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?

                        fredldotme 1 Reply Last reply Reply Quote 0
                        • fredldotme
                          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.

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

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

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

                              @kugiigi I would say the most memory consuming app

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

                                    Can this be installed on rc channel?

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

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

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

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

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

                                          @mihael hopefully

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

                                            And how would you describe the benefits of this chage?

                                            fredldotme 1 Reply Last reply Reply Quote 0
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