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* bug#58687: 29.0.50; Enabling pp-use-max-width dramatically slows down formatting of large sexps like org-persist--index
@ 2022-10-21 12:59 Michael Eliachevitch
  2023-01-12 11:27 ` Ihor Radchenko
  0 siblings, 1 reply; 9+ messages in thread
From: Michael Eliachevitch @ 2022-10-21 12:59 UTC (permalink / raw)
  To: 58687

[-- Attachment #1: Type: text/plain, Size: 5332 bytes --]

I set the new setting `pp-use-max-width' to t to fold the output of interactive commands  like `pp-eval-last-sexp'. However, I found out that this increased the time that kill-emacs took to run by 30 seconds. By profiling I found that this is because I use the latest org-version (9.5.5-gcb1359) on the main branch with persistent caching enabled and in `kill-emacs-hook' it then saves the `org-persist--index' to a file via `org-persist-write:index'. The index sexp can be quite large when one has many org files and when org uses pp on it that takes a long time.

What I wasn't aware when I customized pp-use-max-width is that it's used by other packages to format lisp code and this might slow down these operations quiet significantly, as I just wanted to set only for my custom pretty-printing purposes of usually small sexps.

My suggestion is to put a note into the emacs-news and the variable docstring that it can have significant performance penalties on large sexps. If the performance can be improved that would be also nice, but not sure if that's possible. I assume the authors are aware of the downsides, but it then should be documented well at least.

I attached a file with the value of my `org-persist--index` expression and a file with a benchmark where I run pp on it, which took me 25s when running it with emacs -Q. Until recently my org persist index was much longer, but I pruned it a bit back when I wasn't aware what exactly caused the slowdown.

I had reported this first on the org-mode mailing list at https://lists.gnu.org/archive/html/emacs-orgmode/2022-10/msg00734.html.

Best regards,
Michael Eliachevitch

--
In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.34, cairo version 1.17.6) of 2022-10-20 built on e490
Repository revision: f61db42fc580fb671016c77be942506d9081ac2c
Repository branch: master
System Description: Arch Linux

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[-- Attachment #2: org-persist-index.el --]
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  :expiry 3 :last-access 1666304677.3428493 :last-access-hr "2022-10-21T00:24:37+0200")
 (:container
  ((elisp org-element--headline-cache)
   (elisp org-element--cache))
  :persist-file "33/f3af90-7344-477e-a943-fded6ff14fa4" :associated
  (:hash "3984beca12e81a4342aa8db3af7673e6" :file "/home/michael/org/archive.org_archive" :inode 357866)
  :expiry 3 :last-access 1666304677.353239 :last-access-hr "2022-10-21T00:24:37+0200")
 (:container
  ((elisp org-element--headline-cache)
   (elisp org-element--cache))
  :persist-file "d1/86f70a-c6b4-4f38-9610-4a231396c27a" :associated
  (:hash "79000244264d75f5a31734dd91ff01af" :file "/home/michael/org/roam/journal/2022-08-24.org" :inode 358385)
  :expiry 3 :last-access 1666304677.8559783 :last-access-hr "2022-10-21T00:24:37+0200")
 (:container
  ((elisp org-element--headline-cache)
   (elisp org-element--cache))
  :persist-file "33/5c04cd-d96d-4ee3-a41c-34dd23e2ffa3" :associated
  (:hash "45b163593cbec35a17b7faa2f45dec84" :file "/home/michael/org/roam/journal/2022-06-20.org" :inode 358370)
  :expiry 3 :last-access 1666304677.859343 :last-access-hr "2022-10-21T00:24:37+0200")
 (:container
  ((elisp org-element--headline-cache)
   (elisp org-element--cache))
  :persist-file "63/5cd43b-0753-4f05-b9e8-72fc510d418d" :associated
  (:hash "25b71687d558a10152565ce983f61269" :file "/home/michael/org/phd.org" :inode 358033)
  :expiry 3 :last-access 1666304677.862949 :last-access-hr "2022-10-21T00:24:37+0200")
 (:container
  ((index "2.5"))
  :persist-file "85/7529d0-72fe-411e-b18d-7422afbfad12" :associated nil :expiry never :last-access 1666310369.8001707 :last-access-hr "2022-10-21T01:59:29+0200"))

[-- Attachment #3: benchmark-pp-on-org-persist-index.el --]
[-- Type: text/plain, Size: 307 bytes --]

;; straight bootstrapping code
(require 'pp)

(let ((pp-use-max-width t)
      (pp-max-width 80)
      (org-persist--index
       (with-current-buffer (find-file-noselect "org-persist-index.el")
         (goto-char (point-min))
         (read (current-buffer)))))
  (benchmark-run (pp org-persist--index)))

^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2023-01-13  9:28 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-10-21 12:59 bug#58687: 29.0.50; Enabling pp-use-max-width dramatically slows down formatting of large sexps like org-persist--index Michael Eliachevitch
2023-01-12 11:27 ` Ihor Radchenko
2023-01-12 13:36   ` Eli Zaretskii
2023-01-12 16:19     ` Ihor Radchenko
2023-01-12 16:33       ` Visuwesh
2023-01-12 16:39       ` Eli Zaretskii
     [not found]         ` <87cz7j8j5o.fsf@posteo.de>
2023-01-12 23:02           ` bug#58687: Fwd: " Michael Eliachevitch
2023-01-13  8:42           ` Eli Zaretskii
2023-01-13  9:28           ` Ihor Radchenko

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