Momentary GUI freezes in Aurora and xul.dll!DispatchToTracer
raysatiro at yahoo.com
Thu Sep 29 05:12:00 UTC 2016
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
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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