After logging out and back in the CPU usage seems lower, but without anything
but a terminal open gnome-shell is still the biggest user of the CPU at around
1-2% continuously. After gnome-shell the second highest user is:
Xorg vt2 -displayfd 3
I see there is an update for gnome-shell, so I will try an update now.
jpmeijers@jpmeijers-XPS13-9333:~$ apt policy gnome-shell
gnome-shell:
Installed: 3.36.1-5ubuntu2
Candidate: 3.36.2-1ubuntu1~20.04.1
Version table:
3.36.2-1ubuntu1~20.04.1 500
500 http://uk-mirrors.evowise.com/ubuntu focal-updates/main amd64
Packages
*** 3.36.1-5ubuntu2 100
100 /var/lib/dpkg/status
3.36.1-5ubuntu1 500
500 http://uk-mirrors.evowise.com/ubuntu focal/main amd64 Packages
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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:
New
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?
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