wrong percentage with frequency scaling

Bug #214695 reported by marwal on 2008-04-09
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Gnome System Monitor
Hardy Backports
gnome-system-monitor (Ubuntu)
Ubuntu Desktop Bugs

Bug Description

In system monitor under the tab Processes I can see no process is using more than 10% CPU.
When I select Resources I see CPU1 at 12% and CPU2 at about 40-50%.

If I set the frequency scaling applet to not limit CPU usage and run at 3,20 GHz instead of 400 MHz the percentage in both tabs are compatible.

So, Resources calculates percentage based on what speed my CPU is capped to but Processes always use the value my processor is capable of.

(Using Gnome)

marwal (marwal) on 2008-04-09
description: updated
description: updated
description: updated

Not an issue for Hardy Backports, assigning to gnome-system-monitor.

What version of Ubuntu are you using and what version of gnome-system-monitor are you using?


Changed in hardy-backports:
status: New → Invalid
Changed in gnome-system-monitor:
status: New → Incomplete
importance: Undecided → Low
marwal (marwal) wrote :

~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 8.04
Release: 8.04
Codename: hardy

~$ apt-cache show gnome-system-monitor | grep Version
Version: 2.22.0-1ubuntu3

This has been reported to the developers of the software. You can track the status and add comments here: http://bugzilla.gnome.org/show_bug.cgi?id=530268

Changed in gnome-system-monitor:
status: Incomplete → Confirmed
Changed in gnome-system-monitor:
assignee: nobody → desktop-bugs
status: Confirmed → Triaged
Changed in gnome-system-monitor:
status: Unknown → Confirmed

Question for marwal from upstream:

Does top have the same behaviour ?

marwal (marwal) wrote :

[quote]Does top have the same behaviour ?[/quote]

I don't understand that question. Does top have different views where percentage is calculated in incompatible ways? If that was the question the answer is "no" as far as I believe.

Sebastien Bacher (seb128) wrote :

open a command line, type top there and look at what processes are listed and how much cpu they use, now what values have those in gnome-system-monitor?

marwal (marwal) wrote :

Seems like top uses a third method of calculating process usage. Including screenshots for 400Mhz and 3.20Ghz.

Changed in gnome-system-monitor:
importance: Unknown → Low
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