Bug 25360

Summary:	Butterfly PNG/QNG takes a lot of cpu time after audio/video calls.
Product:	Telepathy	Reporter:	David Laban <david.laban>
Component:	butterfly	Assignee:	Telepathy bugs list <telepathy-bugs>
Status:	RESOLVED INVALID	QA Contact:	Telepathy bugs list <telepathy-bugs>
Severity:	normal
Priority:	lowest	CC:	lfrb
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description David Laban 2009-11-30 06:19:27 UTC

This is probably a symptom of something that's going to screw us when we start deploying it as a server.

Comment 1 Louis-Francis Ratté-Boulianne 2010-01-19 08:59:27 UTC

How are you sure the PNG and QNG take so much CPU time ?

Comment 2 David Laban 2010-01-19 09:30:03 UTC

When I've made a few calls, I get spikes on my cpu graph (applet in gnome-pannel) around the time png/qng show up in the logs, and top says it's butterfly that's responsible. Attaching a profiler to a running program is kinda tricky though, if you don't want to get your figures distorted by the activities that happen before the problem arrises.

It probably won't become a massive issue ever, because when you time-average it, the spikes only take up <5% of my computing power. 

It's probably going to be something really subtle like accidentally triggering a full garbage collection sweep. If you're not up for investigating it, I'll understand.

Comment 3 Jonny Lamb 2010-04-16 15:26:14 UTC

Great, but this sounds quite hand-wavy.

David, please re-open when you have more information regarding the actual problem.

Thanks.

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