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Created attachment 1103134 [details]
screenshot.jpg

Description of problem:
In attached image you can see that processes with PID 9866,9867 have 100% CPU load in htop, but in gnome-system-utility  same processes have only 25% and 24% CPU load.

Version-Release number of selected component (if applicable):
gnome-system-monitor-3.14.1-3.el7.x86_64
kernel-3.10.0-327.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1.run htop
2.run gnome-system-monitor
3.run stress --cpu 2 --timeout 60
4.compare cpu load values in both tools

Actual results:
values are different, gnome-system-monitor shows about one quarter from htop values

Expected results:
values should correspond

This is expected, and because gnome-system monitor is showing the CPU load averaged over the number of cores, whereas htop is showing the load in terms of a single core.

There is an option to configure this behaviour in the gnome-system-monitor prefences ("Divide CPU usage by CPU count") which can be changed by the user.

Good, i misunderstood the following TCMS test case

https://tcms.engineering.redhat.com/case/422330/?from_plan=15435

which was saying that values in htop and gnome-disk-utility "could be slightly different", I will update the case so we can prevent misunderstanding in future.