<div dir="ltr">This sounds like bug 1301301 to me. A fix landed on Aurora just today, so hopefully tomorrow's build will have the fix.<br><br><div><div class="gmail_extra"><div class="gmail_quote">On Mon, Oct 3, 2016 at 11:08 AM, <span dir="ltr"><<a href="mailto:firefox-dev-request@mozilla.org" target="_blank">firefox-dev-request@mozilla.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Today's Topics:<br>
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1. Momentary GUI freezes in Aurora and xul.dll!DispatchToTracer<br>
(Ray Satiro)<br>
<br>
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Message: 1<br>
Date: Thu, 29 Sep 2016 01:12:00 -0400<br>
From: Ray Satiro <<a href="mailto:raysatiro@yahoo.com">raysatiro@yahoo.com</a>><br>
To: <a href="mailto:firefox-dev@mozilla.org">firefox-dev@mozilla.org</a><br>
Subject: Momentary GUI freezes in Aurora and xul.dll!DispatchToTracer<br>
Message-ID: <<a href="mailto:4dc2bc61-74cf-af23-37c9-be16182b7e88@yahoo.com">4dc2bc61-74cf-af23-37c9-<wbr>be16182b7e88@yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"; Format="flowed"<br>
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I'm using Firefox Aurora (20160928004008 atm) in Windows 7 x64 and<br>
recently I've noticed that occasionally there will be a momentary freeze<br>
with 15% CPU usage. I haven't been using it regularly so I'm not sure<br>
how far back it goes, but several days at least. I've tried closing all<br>
the tabs but as I open new tabs I get the same freeze. When it happens<br>
it will continue until I close and reopen Aurora. I have disabled some<br>
extensions after consulting about:performance but not all extensions,<br>
since I don't have a way to immediately reproduce and I don't want to<br>
leave my extensions off all the time.<br>
<br>
Ordinarily I would use mozregression but there are no steps to<br>
reproduce, it just randomly appears. I've used Windows' xperf tool to<br>
monitor the stack and I can see that when the freeze happens the<br>
following have a very high count at the times consistent with the freezes:<br>
<br>
Line #, Process, Stack, Count, Weight, All Count, % Weight<br>
4, , |- xul.dll!DispatchToTracer<jsid><wbr>, 11611, 11610.545804, 11611, 1.57<br>
5, , |- xul.dll!js::Scope::<wbr>traceChildren, 9930, 9929.610630, 9930, 1.34<br>
6, , |- xul.dll!TraversalTracer::<wbr>onChild, 6556, 6555.706800, 6556, 0.89<br>
<br>
Also illustrated in the attached screenshot.<br>
<br>
Does that mean anything to anyone here, and do you have any ideas how I<br>
can trace this further the next time it happens so that I can file a bug<br>
report?<br>
<br>
Also does anyone know why it takes xul.pdb an hour to load in Windows<br>
Performance Analyzer? I had the same problem a year ago the last time I<br>
did a trace like this.<br>
<br>
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