Bug 522628 - High CPU usage of gpk-update-viewer
Summary: High CPU usage of gpk-update-viewer
Alias: None
Product: Fedora
Classification: Fedora
Component: gnome-packagekit
Version: 11
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Richard Hughes
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2009-09-10 21:08 UTC by Christoph Wickert
Modified: 2010-06-28 14:34 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2010-06-28 14:34:44 UTC

Attachments (Terms of Use)
Screenshot showing gpk-update-viewer and it's CPU usage (211.15 KB, image/png)
2009-09-12 23:14 UTC, Christoph Wickert
no flags Details

Description Christoph Wickert 2009-09-10 21:08:41 UTC
Description of problem:
gpk-update-viewer causes a high CPU load while downloading packages

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

How reproducible:

Steps to Reproduce:
1. have a larger queue of updates (21 updates, ~170 MB)
2. run gpk-update-viewer to update your system
Actual results:
Top shows a load of ~20% while on an Intel Core 2 T5500 @ 1.66GHz. This is pretty much for just downloading some packages and showing nice animations. If you have a large number of updates, the system becomes unresponsive for the whole time of the download.

Expected results:
Downloading packages should not cause any notable CPU usage.

Comment 1 Richard Hughes 2009-09-11 16:24:44 UTC
What process is causing the high CPU? I can't reproduce here.

Comment 2 Christoph Wickert 2009-09-11 16:28:16 UTC
As mentioned before: gpk-update-viwewer

Comment 3 Christoph Wickert 2009-09-12 23:14:16 UTC
Created attachment 360823 [details]
Screenshot showing gpk-update-viewer and it's CPU usage

Today the updates queue has 36 updates, which again caused a cpu usage of ~ 30%. I managed to get a screenshot with 34.8%. Seems to be related to the animations, because if the spinners are not in the part of the window that is shown, the load drops. Scrolling also increases the load dramatically.

Comment 4 Richard Hughes 2010-03-23 09:33:00 UTC
Is this still relevant for the latest packages in F12? Thanks.

Comment 5 Christoph Wickert 2010-03-24 02:43:32 UTC
Yes, unfortunately it is.

Comment 6 Richard Hughes 2010-03-26 09:31:40 UTC
Okay, I've tracked this one down, and randomly it's a PackageKit bug. PackageKit is supposed to send:

(start of transaction)


(end of transaction)

and GPK starts a spinner on the action, and stops it on the finished signal. To keep the spinners spinning, we setup a timer that finds the current row, gets the value, and increments it in a tree model.

For one update, this is a trivial amount of CPU. If you've got 50 pending updates, then you've got O(n^n) complexity (as it's only ever designed for 1 or two updates, not all of them) which really hurts the CPU.

The fix we just to correct a conditional in PkBackend, which causes the FINISHED signal to be sent at the correct time.

commit d996046f6e47ca46eab45778e13414d27fbda534
Author: Richard Hughes <richard@hughsie.com>
Date:   Fri Mar 26 09:26:19 2010 +0000

    Ensure the Package(finished) signal is always sent during the transaction. Fixes rh#522628

I'll build a new PK on Monday, and then attach the build to this bug.

Comment 7 Christoph Wickert 2010-03-26 12:31:07 UTC
Thanks a lot.

One more thing I have noticed: The load increases massively when one is scrolling in the window. Therefor if there are lots of small updates or cleanups that get applied very fast, it drives the load up.

Comment 8 Bug Zapper 2010-04-28 10:16:47 UTC
This message is a reminder that Fedora 11 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 11.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '11'.

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Comment 9 Bug Zapper 2010-06-28 14:34:44 UTC
Fedora 11 changed to end-of-life (EOL) status on 2010-06-25. Fedora 11 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.

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