You have been subscribed to a public bug by Dan Dascalescu
(ddascalescu+launchpad):
My CPU was being roasted on all 4 cores, htop showed 25% utilization for
both xorg and compiz, but `sudo gnome-system-monitor` showed much
smaller numbers for xorg (~7%) and compiz (5%).
Killing compiz didn't help - after a dip in the CPU usage and a flash of
the screen, it's back to 100% of the CPU core.
The machine is an ASUS ZenBook UX430UQ Intel Core i7-7500 with a 2GB
NVIDIA 940MX card (but System details shows Intel® HD Graphics 620
(Kabylake GT2) and 16GB RAM.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gnome-system-monitor 3.18.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-42.46~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-42-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.14
Architecture: amd64
Date: Wed Dec 27 02:14:15 2017
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gnome-system-monitor
InstallationDate: Installed on 2017-10-06 (82 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
SourcePackage: gnome-system-monitor
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-system-monitor (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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System monitor under-reports maximum CPU usage by xorg and compiz
https://bugs.launchpad.net/bugs/1740247
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