firefox-dev Digest, Vol 46, Issue 7

[Andrew McCreight]

This sounds like bug 1301301 to me. A fix landed on Aurora just today, so
hopefully tomorrow's build will have the fix.

On Mon, Oct 3, 2016 at 11:08 AM, <firefox-dev-request at mozilla.org> wrote:

> Today's Topics:
>
>    1. Momentary GUI freezes in Aurora and xul.dll!DispatchToTracer
>       (Ray Satiro)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 29 Sep 2016 01:12:00 -0400
> From: Ray Satiro <raysatiro at yahoo.com>
> To: firefox-dev at mozilla.org
> Subject: Momentary GUI freezes in Aurora and xul.dll!DispatchToTracer
> Message-ID: <4dc2bc61-74cf-af23-37c9-be16182b7e88 at yahoo.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> I'm using Firefox Aurora (20160928004008 atm) in Windows 7 x64 and
> recently I've noticed that occasionally there will be a momentary freeze
> with 15% CPU usage. I haven't been using it regularly so I'm not sure
> how far back it goes, but several days at least. I've tried closing all
> the tabs but as I open new tabs I get the same freeze. When it happens
> it will continue until I close and reopen Aurora. I have disabled some
> extensions after consulting about:performance but not all extensions,
> since I don't have a way to immediately reproduce and I don't want to
> leave my extensions off all the time.
>
> Ordinarily I would use mozregression but there are no steps to
> reproduce, it just randomly appears. I've used Windows' xperf tool to
> monitor the stack and I can see that when the freeze happens the
> following have a very high count at the times consistent with the freezes:
>
> Line #, Process, Stack, Count, Weight, All Count, % Weight
> 4, ,   |- xul.dll!DispatchToTracer<jsid>, 11611, 11610.545804, 11611, 1.57
> 5, ,   |- xul.dll!js::Scope::traceChildren, 9930, 9929.610630, 9930, 1.34
> 6, ,   |- xul.dll!TraversalTracer::onChild, 6556, 6555.706800, 6556, 0.89
>
> Also illustrated in the attached screenshot.
>
> Does that mean anything to anyone here, and do you have any ideas how I
> can trace this further the next time it happens so that I can file a bug
> report?
>
> Also does anyone know why it takes xul.pdb an hour to load in Windows
> Performance Analyzer? I had the same problem a year ago the last time I
> did a trace like this.
>
>
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> End of firefox-dev Digest, Vol 46, Issue 7
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