Bug 748241 - gnome-shell uses excessive CPU with System Monitor extension
gnome-shell uses excessive CPU with System Monitor extension
Product: Fedora
Classification: Fedora
Component: gnome-shell-extensions (Show other bugs)
x86_64 Linux
unspecified Severity high
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Assigned To: Rahul Sundaram
Fedora Extras Quality Assurance
RejectedBlocker https://fedoraproject...
: CommonBugs
Depends On:
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Reported: 2011-10-23 10:32 EDT by Brian G. Anderson
Modified: 2013-02-13 13:41 EST (History)
18 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2013-02-13 13:41:52 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Brian G. Anderson 2011-10-23 10:32:20 EDT
Description of problem:
After I suspend my laptop and resume I find that gnome-shell is using 30-60% of my CPU.  I have to <F2>r restart the shell to get the CPU usage back down to the usual 1%.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. suspend the computer
2. resume the computer
3. use htop to see the gnome-shell usage
Actual results:

Expected results:

Additional info:
Comment 1 Frederic Kerneuzet 2011-10-28 05:41:39 EDT
I have exactly the same issue on my IBM T61 laptop.

But it seems to be the same thing after a yum update/installation of packages.
Comment 2 John J. McDonough 2011-10-31 19:37:09 EDT
Similar result on a T520, but it doesn't seem to need a suspend/resume.  Not sure yet whether screen blanking or just waiting long enough does it.

gnome-shell 3.2.1-2
kernel 3.1.0-5
Comment 3 Brian G. Anderson 2011-11-01 10:57:56 EDT
I agree with the observation that it doesn't require suspend/resume.  It seems to be a screen blank or idle to long problem.
Comment 4 John J. McDonough 2011-11-01 11:53:48 EDT
Last night I rebooted shortly before bed, did a quick check and then left it.  gnome-shell was consuming 85% CPU in the morning, memory about a half gig.  I think this may be related to the memory bug.
Comment 5 John J. McDonough 2011-11-02 17:43:57 EDT
I'm thinking this is probably a blocker, and also suspect it is the same as 726978.  The system gets pretty miserable after a while with a bunch of cores, with only one I suspect it would be unusable.  The Alt+F2-r thing works well, but not the sort of thing you want to ship.

I'm marking as a blocker so it at least gets discussed.
Comment 6 Adam Williamson 2011-11-03 12:44:17 EDT
Discussed at the 2011-11-02 go/no-go meeting, agreed this is rejected as a blocker: it's hardware specific (i.e. does not affect other hardware, as attested at the meeting), doesn't infringe any criteria, and can be reasonably addressed with an update.

Fedora Bugzappers volunteer triage team
Comment 7 Frederic Kerneuzet 2011-11-03 12:48:20 EDT
Are you sure that's hardware specific ? Because we seem to have 3 different hardware and the same issue.

I'll try on another computer, to see if this issue still exists..
Comment 8 Adam Williamson 2011-11-03 13:06:55 EDT
Yes. I have two systems running F16 full time and have not seen this once on either of them; two other people in the review meeting said the same thing about their hardware.

Fedora Bugzappers volunteer triage team
Comment 9 John J. McDonough 2011-11-03 15:10:22 EDT
Last night some folks seemed confident that it had to do with the graphics.  Not sure what evidence there is of that, but for reference, mine is a i7-2760QM with Nvidia NVS 4200M.
Comment 10 Brian G. Anderson 2011-11-03 16:26:24 EDT
I use an Intel graphics card i915 (sandybridge).  I'm curious, what hardware is this bug specific to?  Not the graphics card apparently.
Comment 11 Adam Williamson 2011-11-03 18:05:42 EDT
could be configuration specific too - point is, it doesn't affect all systems.

are you all using any Shell extensions?

Fedora Bugzappers volunteer triage team
Comment 12 Brian G. Anderson 2011-11-04 13:56:25 EDT
Yes, I am using shell extensions.  After some experimentation, my CPU problem goes away if I disable SystemMonitor.  And that makes me remember, that I always wondered why my CPU under htop was 60% while SystemMonitor never showed a problem.

Of course, many gnome-shell-extension-* packages are broken.
Comment 13 Adam Williamson 2011-11-04 15:07:59 EDT
I believe there was an ML thread where someone mentioned System Monitor was causing issues, too. Are you rest of you using that extension as well?

Fedora Bugzappers volunteer triage team
Comment 14 Frederic Kerneuzet 2011-11-04 15:11:31 EDT
You're totally right, I'm also using this extension.
Comment 15 John J. McDonough 2011-11-04 15:23:20 EDT
Same here
Comment 16 Adam Williamson 2011-11-04 15:55:52 EDT
Updating summary and re-assigning.

Upstream has one recent commit to system-monitor:


I dunno if that'd help this. There doesn't seem to be an upstream report of this specific issue.

Fedora Bugzappers volunteer triage team
Comment 17 Jasper St. Pierre 2011-11-04 16:11:44 EDT
That just fixes it so that disabling/enabling the extension works correctly.

The way it works is that we retrieve values from GTop and re-draw the entire monitor every half second, even if the actor is not being displayed. That is quite resource intensive.

Please file a new bug.
Comment 18 Adam Williamson 2011-11-08 01:12:54 EST

Fedora Bugzappers volunteer triage team
Comment 19 István Tóth 2011-11-16 03:49:12 EST
I have the same problem as the original reporter on a HP 8540p laptop since I have installed and turned on SystemMonitor.

x86_64, all updates installed, + latest binary nvidia drivers from rpmfusion.
Comment 20 Fedora End Of Life 2013-01-16 10:35:00 EST
This message is a reminder that Fedora 16 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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Comment 21 Fedora End Of Life 2013-02-13 13:41:56 EST
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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