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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: Sat, 10 Aug 2019 11:27:29 -0500
User-agent: mu4e 1.2.0; emacs 27.0.50

Hello -

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?

Thanks,
Alex

- ... 51442 74% Automatic GC 51440 74% + winum-select-window-1 1 0% + #<compiled 0x443aa1> 1 0% + command-execute 11973 17% + timer-event-handler 4837 6% + flyspell-post-command-hook 536 0% + redisplay_internal (C function) 262 0% + xcb:-connection-filter 60 0% + internal-timer-start-idle 38 0% mu4e~proc-filter 11 0% + winner-save-old-configurations 6 0% + eldoc-pre-command-refresh-echo-area 4 0% + #<compiled 0x1ffab289c50b> 3 0% + undo-auto--add-boundary 1 0% exwm-layout--on-echo-area-change 1 0% + mu4e~update-sentinel-func 1 0% + gui-set-selection 1 0% + #<compiled 0x10b7815> 1 0%



In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.10) Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: NixOS 19.03.173251.56d94c8c69f (Koi)

Configured using:
'configure
--prefix=/nix/store/zwkzz533szjmra431czdyr39hibfzxni-emacs-27.0.50
--disable-build-details --with-modules --with-x-toolkit=gtk3 --with-xft
CFLAGS=-DMAC_OS_X_VERSION_MAX_ALLOWED=101200'
Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER GMP
Important settings:
 value of $LANG: en_US.UTF-8
 locale-coding-system: utf-8-unix

Memory information:
((conses 16 678039 134311)
(symbols 48 88978 26)
(strings 32 245611 6884)
(string-bytes 1 7634214)
(vectors 16 142349)
(vector-slots 8 3015732 58606)
(floats 8 741 448)
(intervals 56 9225 1373)
(buffers 992 1263))





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