Bug 156345

Summary:	news ticker widget causing plasma to consume > 40% CPU
Product:	knewsticker	Reporter:	jamese <james.ellis>
Component:	general	Assignee:	Frerich Raabe <raabe>
Status:	RESOLVED NOT A BUG
Severity:	normal
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Attachments:	plasma strace while it is consuming 40% CPU load average graph showing before and after news ticker is closed

Description jamese 2008-01-21 22:42:19 UTC

Version:            (using KDE 4.0.0)
Installed from:    Ubuntu Packages
OS:                Linux

Hi

The plasma news ticker widget sometimes seems to be causing plasma to consume > 40% CPU. Upon plasma startup, my laptop CPU fan starts to blow which it rarely does, top reveals plasma running at 40%, load average 3-4 and an strace as attached.

I selectively closed widgets on the screen and the CPU load dropped to normal when the news ticker widget was closed.

Processor is a single Pentium M 1.6Hhz, if that helps.
Thanks

Comment 1 jamese 2008-01-21 22:43:24 UTC

Created attachment 23183 [details]
plasma strace while it is consuming 40% CPU

Comment 2 jamese 2008-01-21 22:44:17 UTC

Created attachment 23184 [details]
load average graph showing before and after news ticker is closed

Comment 3 Aaron J. Seigo 2008-01-22 01:47:26 UTC

this is actually an upstream bug in Qt, and they are aware of it. i wish bugzilla had an Upstream option for closing; in my dreams it would even forward it on to the upstream's tracker.

i'm marking it INVALID, even though it isn't. it's just that we're working on this upstream in their process. thanks for reporting, though, very thoroughly researched and reported.

Comment 4 Frerich Raabe 2008-01-22 11:36:34 UTC

For what it's worth, the load caused by the news ticker should be much lower if you choose the 'paging' view in the configuration dialog.