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* bug#45200: Memory leaks: (garbage-collect) fails to reclaim memory
@ 2020-12-12 18:43 Konstantin Kharlamov
  2020-12-12 20:15 ` Eli Zaretskii
                   ` (2 more replies)
  0 siblings, 3 replies; 88+ messages in thread
From: Konstantin Kharlamov @ 2020-12-12 18:43 UTC (permalink / raw)
  To: 45200

The problem is basically: (garbage-collect) refuses to collect some of the memory. It is more visible if you delay garbage collection, which is what I do for for performance-related reasons. My config has the following snippet:

    ;; only run garbage collection on idle
    (setq gc-cons-threshold most-positive-fixnum)
    (run-with-idle-timer 2 t (lambda () (garbage-collect)))

How much memory gets lost depends on configuration. For me right after start the difference is 40 MB: ≈60 MB is Emacs PSS size without above code, and ≈100 MB it is when garbage-collection is delayed, *after* I run explicitly (garbage-collect). It is less visible without any other configs, nonetheless it's visible.

# Steps to reproduce:

1. Run `mkdir /tmp/.emacs.d`
2. Run emacs as `HOME=/tmp/ emacs`, and measure its PSS
3. Create a file /tmp/.emacs.d/early-init.el with content:

    ;; only run garbage collection on idle
    (setq gc-cons-threshold most-positive-fixnum)
    (run-with-idle-timer 2 t (lambda () (garbage-collect)))

4. Run emacs as `HOME=/tmp/ emacs`, evaluate (garbage-collect), then measure its PSS

## Expected

Size has no statistically-significant difference, because in both cases we garbage-collected memory.

## Actual

Size without calling explicit garbage-collect, from 3 runs, varied around 41.2..41.7 MB.

Size afterwards, also 3 runs, varied around 45.4..45.5 MB.

This is 4 MB lost. While not much, but as I mentioned it grows as much as to 40MB. The Emacs whose emacslient I'm using to write this email has size 218 MB, and now I wouldn't be surprised if much of that is actually a leaked memory.

# Version

Emacs-git 28.0.50, build from commit abd15e088e99






^ permalink raw reply	[flat|nested] 88+ messages in thread

end of thread, other threads:[~2022-05-01  9:43 UTC | newest]

Thread overview: 88+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-12-12 18:43 bug#45200: Memory leaks: (garbage-collect) fails to reclaim memory Konstantin Kharlamov
2020-12-12 20:15 ` Eli Zaretskii
2020-12-12 22:44   ` Konstantin Kharlamov
2020-12-12 22:59     ` Lars Ingebrigtsen
2020-12-13  6:08       ` Eli Zaretskii
2020-12-13  5:53     ` Eli Zaretskii
2020-12-13 12:07       ` Konstantin Kharlamov
2021-01-24 15:24 ` bug#45200: [PATCH] Force Glibc to free the memory freed Konstantin Kharlamov
2021-01-24 15:40   ` Eli Zaretskii
2021-01-25 22:17     ` DJ Delorie
2021-01-25 22:28       ` Konstantin Kharlamov
2021-01-26 14:55         ` Eli Zaretskii
2021-01-26 15:02           ` Konstantin Kharlamov
2021-01-26 15:30           ` Stefan Monnier
2021-02-02 21:17             ` Konstantin Kharlamov
2021-02-03  4:45               ` Stefan Monnier
2021-02-03  4:50                 ` Stefan Monnier
2021-02-03  6:04                   ` Konstantin Kharlamov
2021-02-03  7:07                     ` Eli Zaretskii
2021-02-03  7:15                       ` Konstantin Kharlamov
2021-02-03  7:39                     ` martin rudalics
2021-02-03  8:23                       ` Konstantin Kharlamov
2021-02-03  9:35                         ` martin rudalics
2021-02-03  9:49                           ` Konstantin Kharlamov
2021-02-03 10:35                             ` Konstantin Kharlamov
2021-02-03 11:06                             ` martin rudalics
2021-02-03 11:08                               ` Konstantin Kharlamov
2021-02-03 11:16                                 ` Konstantin Kharlamov
2021-02-03 12:56                                 ` martin rudalics
2021-02-03 13:00                                   ` Konstantin Kharlamov
2021-02-03 15:14                                     ` martin rudalics
2021-02-03 15:15                                     ` Stefan Monnier
2021-02-03 15:29                                       ` Konstantin Kharlamov
2021-02-03 16:02                                         ` Stefan Monnier
2021-02-03 16:35                                           ` Konstantin Kharlamov
2021-02-03 16:51                                             ` Stefan Monnier
2021-02-03 19:30                                               ` DJ Delorie
2021-02-03 19:36                                             ` DJ Delorie
2021-02-03 20:28                                               ` Konstantin Kharlamov
2021-02-03 20:51                                                 ` DJ Delorie
2021-05-18 20:12                                           ` Konstantin Kharlamov
2021-05-19  4:11                                             ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-19  4:26                                               ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-05-19  6:46                                                 ` Konstantin Kharlamov
2021-05-19  9:47                                                   ` Eli Zaretskii
2021-05-19  9:55                                                     ` Konstantin Kharlamov
2021-05-19 10:09                                                       ` Eli Zaretskii
2021-02-03 14:51                             ` Eli Zaretskii
2021-02-03 15:01                               ` Konstantin Kharlamov
2021-02-03 14:44                         ` Eli Zaretskii
2021-02-03 15:12                           ` Andreas Schwab
2021-02-03 19:25                           ` DJ Delorie
2021-02-03 19:49                             ` Eli Zaretskii
2021-02-03 21:00                               ` DJ Delorie
2021-02-03 20:24                             ` Stefan Monnier
2021-02-03 20:42                               ` DJ Delorie
2021-02-03 22:07                                 ` Stefan Monnier
2021-02-03 22:21                                   ` DJ Delorie
2021-02-03 23:32                                     ` Stefan Monnier
2021-02-04  0:31                                       ` DJ Delorie
2021-02-04  3:26                                         ` Stefan Monnier
2021-02-04  3:38                                           ` DJ Delorie
2021-02-04  3:55                                             ` Stefan Monnier
2021-02-04  4:02                                               ` DJ Delorie
2021-02-04  4:19                                                 ` Stefan Monnier
2021-02-04  4:26                                                   ` DJ Delorie
2021-02-04  4:04                                               ` DJ Delorie
2021-02-03 15:15                     ` Stefan Monnier
2021-01-26 14:49       ` Eli Zaretskii
2021-01-26 16:13         ` DJ Delorie
2021-12-04 23:20     ` bug#45200: Memory leaks: (garbage-collect) fails to reclaim memory Lars Ingebrigtsen
2021-12-05  6:23       ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-12-05  8:26         ` Eli Zaretskii
2022-05-01  9:43           ` bug#45200: Wishlist: There should be a `malloc-trim' function Lars Ingebrigtsen
2021-12-05 19:59         ` bug#45200: Memory leaks: (garbage-collect) fails to reclaim memory Lars Ingebrigtsen
2021-12-05  7:07       ` Eli Zaretskii
2021-01-24 18:51 ` Stefan Monnier
2021-01-24 19:00   ` Konstantin Kharlamov
2021-01-24 19:06     ` Konstantin Kharlamov
2021-01-24 19:55       ` Eli Zaretskii
2021-01-24 19:12     ` Stefan Monnier
2021-01-24 20:00       ` Konstantin Kharlamov
2021-01-24 20:11         ` Eli Zaretskii
2021-01-24 20:21           ` Konstantin Kharlamov
2021-01-24 21:20             ` Stefan Monnier
2021-01-24 21:26               ` Konstantin Kharlamov
2021-01-24 21:41                 ` Stefan Monnier
2021-01-24 21:55                   ` Konstantin Kharlamov

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