External monitor hang with NSApplication re-entrance |
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Issue descriptionThe attached sample came from a user report. The problem situation is: 1) Be running Mojave on a Macbook 2) Connect an external display The sample shows something odd: re-entrance into NSApplication run. I'm not sure if or how that is supposed to occur. I have asked the original reporter to post more details and otherwise engage on this bug.
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Nov 22
Actually it seems like there's quite a bit of UI lag even without the external monitor connected, though it's noticeably worse if the external monitor is connected. Attached another sample from Activity Monitor.
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Nov 26
mac triage: ccameron@, help? :)
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Nov 28
I'm having a hard time seeing lag sources in the samples. Looks like we're idle most of the time in the browser. I also don't have a clear picture from the bug report about what is laggy (is it scrolling in web contents, typing in the omnibox, dragging a tab around the tabstrip, etc)? I'll need more info to get an idea. Couple of things 1. Could you attach a screencast (use Quicktime) of the lag? If getting that to work, esp during monitor plug/unplug is hard, then a cellphone video would be good. Point out the parts of the video that are bad. 2. Please capture a trace of the lag. In about:tracing, include just the categories toplevel, views, ui, gpu, and viz.
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Nov 29
The lag was in response to mouse events, both mouse-over and click. I'd mouse over a message in the gmail inbox and it'd take a solid 1-2s before the UI reflected the mouse-hover. Just as I went to capture a new trace, performance returned to normal (after over a week of being really bad). I'll capture another trace and a video if it gets bad again. Thanks for looking into it!
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Nov 29
Ah, didn't take long for it to return! I collected another trace in GMail and a video. Attached the trace. The video is here (access restricted to google.com): https://drive.google.com/file/d/1dW5_3X4o24WPtYSfVSOEjZFAqDvSRjRd/view?usp=sharing Please don't make it public as it contains images of my email which may have confidential stuff in it.
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Dec 6
Is the last trace I captured helpful?
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Dec 7
#6: We're not sure yet - nobody has had time to look :( |
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Comment 1 by garymm@google.com
, Nov 21