[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
I'm not sure what changed to make 19.10 heavier than 19.04, but I can explain what you are seeing. What you are seeing is an OpenGL-based application (Firefox or Chromium) that is being forced to update its entire window constantly. Since it is OpenGL-based, gnome-shell does not have the opportunity to identify just the small area of the screen that is changing, but has to update the entire application window at full frame rate. To do that in software without a GPU is expected to use a lot of CPU and multiple threads, sorry. ** Summary changed: - gnome-shell 100% CPU usage on all cores when animated gif is displayed + gnome-shell (via Mesa/LLVMpipe in a virtual machine) uses all CPU cores just to update the screen ** Changed in: gnome-shell (Ubuntu) Importance: Undecided => Low ** Changed in: gnome-shell (Ubuntu) Status: Incomplete => Triaged ** Also affects: mesa (Ubuntu) Importance: Undecided Status: New ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Changed in: mesa (Ubuntu) Importance: Undecided => Low ** Changed in: mesa (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell (via Mesa/LLVMpipe in a virtual machine) uses all CPU cores just to update the screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
Yes, it is a virtual machine (and hence 3 CPUs!) - though it didn't show these symptoms with Ubuntu 19.04 (noticed by laptop fans going on as soon as I visit a page with animated gifs, i.e. showing build status and such). There are no gnome extensions installed. ** Attachment added: "dmesg.txt" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301944/+files/dmesg.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
** Attachment added: "lspci.txt" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301946/+files/lspci.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
** Attachment added: "glxinfo.txt" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301945/+files/glxinfo.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
4. Run: dmesg > dmesg.txt and attach the file 'dmesg.txt' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
3. Run: dmesg > dmesg.txt and attach the file 'dmesg.txt' -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
Thanks. The above attachment suggests to me that this is a virtual machine or something unusual, because: [ 34.403367] tomasz gnome-shell[1410]: Failed to initialize accelerated iGPU/dGPU framebuffer sharing: Do not want to use software renderer (llvmpipe (LLVM 9.0, 256 bits)), falling back to CPU copy path [ 34.918603] tomasz gnome-shell[1410]: glamor: 'wl_drm' not supported [ 34.918603] tomasz gnome-shell[1410]: Missing Wayland requirements for glamor GBM backend [ 34.918603] tomasz gnome-shell[1410]: Failed to initialize glamor, falling back to sw So that's where all the CPU is going... It's Mesa trying to use all the CPU cores to emulate a GPU in software. Probably. Next, please: 1. Run: lspci -k > lspcik.txt and attach the file 'lspcik.txt' 2. Run: glxinfo > glxinfo.txt and attach the file 'glxinfo.txt' 3. Tell us if you have any gnome-shell extensions installed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
apport information ** Tags added: apport-collected ** Description changed: This started to happen with Ubuntu 19.10. When an animated gif is displayed in a browser, gnome-shell begins using 100% CPU on all cores. To reproduce: 1) open Firefox, or Chromium 2) load an URL where an animated gif is displayed - you can also use this direct link to https://i.stack.imgur.com/h6viz.gif - 3) gnome-shell will start using 100% CPU on all cores (as long as - Firefox/Chromium window is in the foreground) + 3) gnome-shell will start using 100% CPU on all cores (as long as Firefox/Chromium window is in the foreground) + --- + ProblemType: Bug + ApportVersion: 2.20.11-0ubuntu8.1 + Architecture: amd64 + DisplayManager: gdm3 + DistroRelease: Ubuntu 19.10 + GsettingsChanges: + + InstallationDate: Installed on 2019-05-12 (172 days ago) + InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) + Package: gnome-shell 3.34.1-1ubuntu1 + PackageArchitecture: amd64 + ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1 + RelatedPackageVersions: mutter-common 3.34.1-1ubuntu1 + Tags: eoan + Uname: Linux 5.3.0-19-generic x86_64 + UpgradeStatus: Upgraded to eoan on 2019-10-16 (15 days ago) + UserGroups: + + _MarkForUpload: True ** Attachment added: "Dependencies.txt" https://bugs.launchpad.net/bugs/1850874/+attachment/5301936/+files/Dependencies.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
Wow, yes. That is unusual. Multiple threads exist in gnome-shell but they're pretty well hidden from the main code, mostly handling asynchronous IO etc... Next we need to see more information about the machine. Please run this command to send it automatically: apport-collect 1850874 ** No longer affects: mutter (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
** Attachment added: "gnome-shell threads" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301916/+files/Screenshot_20191101_115659.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
In "ps -eLf": tomasz1410 1265 1410 1 10 Oct31 ?00:33:23 /usr/bin/gnome-shell tomasz1410 1265 1421 0 10 Oct31 ?00:00:00 /usr/bin/gnome-shell tomasz1410 1265 1423 0 10 Oct31 ?00:00:02 /usr/bin/gnome-shell tomasz1410 1265 1424 0 10 Oct31 ?00:00:00 /usr/bin/gnome-shell tomasz1410 1265 1425 7 10 Oct31 ?02:33:40 /usr/bin/gnome-shell tomasz1410 1265 1426 7 10 Oct31 ?02:32:22 /usr/bin/gnome-shell tomasz1410 1265 1427 7 10 Oct31 ?02:32:50 /usr/bin/gnome-shell tomasz1410 1265 1434 0 10 Oct31 ?00:00:02 /usr/bin/gnome-shell tomasz1410 1265 1435 0 10 Oct31 ?00:00:02 /usr/bin/gnome-shell tomasz1410 1265 1436 0 10 Oct31 ?00:00:02 /usr/bin/gnome-shell So it's definitely using multiple threads. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1850874] Re: gnome-shell 100% CPU usage on all cores when animated gif is displayed
Hmm, gnome-shell is mostly single threaded so it shouldn't be able to use "all cores". It should saturate only one core at most. Please provide a screenshot of 'top' running in a Terminal window, showing that gnome-shell (or anything) is using the CPU. ** Tags added: eoan performance ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete ** Changed in: mutter (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850874 Title: gnome-shell 100% CPU usage on all cores when animated gif is displayed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
