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
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"
** Attachment added: "lspci.txt"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301946/+files/lspci.txt
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https://bugs.launchpad.net/bugs/1850874
** Attachment added: "glxinfo.txt"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301945/+files/glxinfo.txt
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4. Run: dmesg > dmesg.txt
and attach the file 'dmesg.txt'
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Title:
gnome-shell 100% CPU usage on all cores when animated gif is displayed
To
3. Run: dmesg > dmesg.txt
and attach the file 'dmesg.txt'
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Title:
gnome-shell 100% CPU usage on all cores when animated gif is displayed
To
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
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
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
** Attachment added: "gnome-shell threads"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1850874/+attachment/5301916/+files/Screenshot_20191101_115659.png
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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 ?
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
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