> Looking at htop I can see gnome-shell takes anywhere between 5% and
50% of CPU, normally between 10% and 20%.
This is a little too vague for us to be able to action right now, but I
can suggest checking a few things that commonly cause high CPU for other
people:
1. Uninstall all non-Ubuntu gnome-shell extensions.
2. Uninstall 'indicator-multiload' if you have it (bug 784055).
3. Try disabling 'Ubuntu AppIndicators' in gnome-shell-extension-prefs.
4. Make sure the clock in your Gnome panel at the top of the screen is
NOT set to show seconds.
If the problem is still not solved then please run these commands:
lspci -k > lspcik.txt
journalctl -b0 > journal.txt
and attach the resulting text files. And if you are willing then please
attach a screenshot of your desktop so we can see if it entails anything
unusual I haven't yet thought of.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
** Tags added: performance
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1880723
Title:
gnome-shell high CPU usage on Ubuntu 20.04
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
After having a couple of terminals and and Chrome windows open for
most of the day, everything becomes sluggish. Switching desktops is
clearly very slow and Chrome's windows don't react to all mouse
actions.
Looking at htop I can see gnome-shell takes anywhere between 5% and
50% of CPU, normally between 10% and 20%.
With Chrome and terminal windows open, an strace on the PID of gnome-
shell shows the following:
jpmeijers@jpmeijers-XPS13-9333:~$ sudo strace -c -p 3491
[sudo] password for jpmeijers:
strace: Process 3491 attached
^Cstrace: Process 3491 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
36.37 0.108651 3 30932 16434 recvmsg
34.99 0.104531 3 29278 poll
26.20 0.078272 5 14601 writev
1.06 0.003158 2 1181 ioctl
0.35 0.001041 2 430 write
0.27 0.000812 1 602 getpid
0.26 0.000773 4 158 read
0.11 0.000316 3 96 timerfd_create
0.10 0.000313 3 96 close
0.10 0.000300 4 73 4 futex
0.08 0.000241 2 96 timerfd_settime
0.07 0.000201 0 228 mprotect
0.04 0.000111 27 4 getrusage
0.01 0.000038 12 3 sendmsg
0.00 0.000008 0 11 munmap
0.00 0.000005 0 6 mmap
0.00 0.000002 1 2 1 recvfrom
------ ----------- ----------- --------- --------- ----------------
100.00 0.298773 77797 16439 total
After closing Chrome windows:
jpmeijers@jpmeijers-XPS13-9333:~$ sudo strace -c -p 3491
strace: Process 3491 attached
^Cstrace: Process 3491 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
36.24 0.099458 3 30319 15900 recvmsg
35.15 0.096450 3 29053 poll
26.86 0.073711 5 14500 writev
0.68 0.001858 1 930 ioctl
0.40 0.001092 3 318 write
0.14 0.000386 6 64 close
0.13 0.000344 0 469 getpid
0.11 0.000295 4 64 timerfd_create
0.11 0.000292 1 222 mprotect
0.06 0.000177 2 64 timerfd_settime
0.06 0.000153 6 25 munmap
0.04 0.000121 1 121 read
0.01 0.000038 0 49 4 futex
0.01 0.000018 6 3 sendmsg
0.00 0.000013 13 1 restart_syscall
0.00 0.000000 0 7 mmap
0.00 0.000000 0 2 getrusage
------ ----------- ----------- --------- --------- ----------------
100.00 0.274406 76211 15904 total
After closing the terminal windows too, therefore only the terminal running
strace is open:
jpmeijers@jpmeijers-XPS13-9333:~$ sudo strace -c -p 3491
strace: Process 3491 attached
^Cstrace: Process 3491 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
36.43 0.196569 3 54115 27576 recvmsg
35.25 0.190224 3 53266 poll
26.92 0.145275 5 26592 writev
0.30 0.001631 4 405 write
0.23 0.001245 5 248 mprotect
0.23 0.001229 9 136 close
0.21 0.001120 1 621 ioctl
0.16 0.000889 6 136 timerfd_create
0.13 0.000711 5 136 timerfd_settime
0.06 0.000328 1 300 getpid
0.03 0.000180 2 68 3 futex
0.03 0.000159 1 85 read
0.01 0.000053 8 6 sendmsg
0.01 0.000027 3 9 mmap
0.00 0.000002 0 3 munmap
0.00 0.000002 0 4 getrusage
0.00 0.000000 0 1 recvfrom
------ ----------- ----------- --------- --------- ----------------
100.00 0.539644 136131 27579 total
I see the calls and errors to recvmsg climbing. What does this mean, and what
is causing this?
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-25 (31 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Package: gnome-shell 3.36.2-1ubuntu1~20.04.1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1
Tags: focal
Uname: Linux 5.4.0-31-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip docker lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1880723/+subscriptions
--
Mailing list: https://launchpad.net/~desktop-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~desktop-packages
More help : https://help.launchpad.net/ListHelp
