I'm seeing something very similar.
Did a fresh install of 20.04 a week ago.
After being logged in half a day things really start slowing down.
Alt+Tab takes a few seconds to pop up, then you tab through to e.g. an
open Calculator instance and that takes 8 seconds to come to the
foreground. gnone-shell using 50% of one CPU.
Have tried your suggestions to no avail.
attaching the logs requested. journalctl shows a tone of javascript errors
e.g.
JS ERROR: TypeError: null has no properties
_onFocusChanged@resource:///org/gnome/shell/ui/closeDialog.js:135:9
$ sudo strace -c -p 7087
strace: Process 7087 attached
^Cstrace: Process 7087 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
34.73 0.215539 2 98592 sendmsg
23.99 0.148891 2 70929 36904 recvmsg
22.68 0.140739 2 68317 poll
16.42 0.101903 2 34030 writev
1.21 0.007527 4 1716 ioctl
0.46 0.002841 3 932 138 futex
0.25 0.001521 5 300 260 stat
0.10 0.000590 0 656 mprotect
0.06 0.000362 0 1165 write
0.04 0.000278 5 54 munmap
0.03 0.000205 0 305 getpid
0.01 0.000089 0 383 read
0.00 0.000022 1 13 timerfd_create
0.00 0.000017 1 13 close
0.00 0.000017 1 10 mmap
0.00 0.000017 1 13 timerfd_settime
0.00 0.000002 2 1 restart_syscall
0.00 0.000000 0 2 getrusage
------ ----------- ----------- --------- --------- ----------------
100.00 0.620560 277431 37302 total
Your journalctl command produced a 1.5Gb file. I have attached the last 100K
lines. Let me know if you need more.
** Attachment added: "journal-tail.txt"
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1880723/+attachment/5393304/+files/journal-tail.txt
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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
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