bug#37000: 27.0.50; gc and laggy Emacs

[Alex Branham]

On Sat 10 Aug 2019 at 19:50, Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Alex Branham <alex.branham@gmail.com>
>> 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.

Alex