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bug#37000: 27.0.50; gc and laggy Emacs

From: Alex Branham
Subject: bug#37000: 27.0.50; gc and laggy Emacs
Date: Thu, 15 Aug 2019 09:56:44 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

On Sat 10 Aug 2019 at 19:50, Eli Zaretskii <address@hidden> wrote:

>> From: Alex Branham <address@hidden>
>> Date: Sat, 10 Aug 2019 11:27:29 -0500
>> Recently I've noticed Emacs sometimes getting _very_ laggy, as in 
>> taking up to a half-second to display the a single character that 
>> I type. M-x profiler-start suggests that garbage-collection is 
>> taking up too much time (see below my signature for example 
>> output). gc-cons-percentage and gc-cons-threshold are at their 
>> default values. I can't figure out how to reproduce this reliably, 
>> but running M-x relint-directory on the Emacs source tree seems to 
>> do a decent job triggering it. My Emacs is built from commit 
>> 4ce9c6d0b58bd77bc811d6c1c5caf955a5a0be2f (~ 4 days ago) of the 
>> master branch. How can I go about tracking this down?
> Trying to bisect to find the offending commit would be one way.

Thanks. I noticed there's some activity around gc on master currently.
I'll wait for that to pass before trying this.

I'll note though that I don't see this issue on 26.2.


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