I'm seeing moderately high CPU usage from the gnome-shell process as
well. It seems to stay running at at least 5% at all times. I decided to
use strace to see what it was doing:
$ sudo strace -c -p 6916
strace: Process 6916 attached
strace: Process 6916 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
25.38 0.054330 6 9277 8116 recvmsg
21.45 0.045927 10 4454 ioctl
18.90 0.040462 12 3295 poll
11.95 0.025583 24 1045 24 futex
7.23 0.015478 11 1388 writev
4.05 0.008663 7 1302 write
2.82 0.006048 4 1500 getpid
2.14 0.004579 5 914 mprotect
2.07 0.004431 7 657 read
1.11 0.002372 11 212 timerfd_create
0.94 0.002012 8 251 close
0.87 0.001859 9 212 timerfd_settime
0.40 0.000857 22 39 openat
0.20 0.000437 6 78 fstat
0.19 0.000413 3 120 getrusage
0.11 0.000244 7 36 mmap
0.10 0.000209 5 39 fcntl
0.06 0.000129 129 1 restart_syscall
0.02 0.000037 37 1 munmap
0.01 0.000029 7 4 1 recvfrom
0.00 0.000000 0 70 60 stat
------ ----------- ----------- --------- --------- ----------------
100.00 0.214099 24895 8201 total
The strange thing here is the large number of EAGAIN errors from the
recvmsg() syscall. When I run strace without the -c I see output such
as:
recvmsg(12, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(12, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(5, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(12, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(12, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
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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/1773959
Title:
High CPU usage by gnome-shell when only running gnome-terminal
Status in gnome-shell package in Ubuntu:
Confirmed
Bug description:
Even when doing nothing but displaying a terminal screen with top
running gnome-shell uses 10% of a CPU. That seems excessive. I
disabled all extensions to try and make the test fair. Enabling the
system monitor extension increases the load to 13-14%. It seems that
the gnome-shell screen painting is highly CPU consuming even if screen
updates are infrequent (1 a second for all these cases).
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue May 29 11:38:05 2018
DisplayManager: gdm3
InstallationDate: Installed on 2016-10-27 (578 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to bionic on 2018-05-19 (9 days ago)
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https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1773959/+subscriptions
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