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From: Tim Frana <tfr@mailbox.org>
To: tfr@mailbox.org
Cc: emacs-orgmode@gnu.org
Subject: Bug: performance issue in org-font-lock-add-priority-faces related to org-priority-regexp [9.4 (9.4-7-g3eccc5-elpaplus @ /home/standard/.emacs.d/elpa/26.3/develop/org-plus-contrib-20200921/)]
Date: Wed, 7 Oct 2020 23:09:40 +0200	[thread overview]
Message-ID: <d157dad4-7d64-15aa-89cd-1431b3813e08@mailbox.org> (raw)
In-Reply-To: <87bbd664-2da6-0551-25f1-9ff287fed9f2%40mailbox.org>

Apologies, the extreme slowdown for the regex in my setup is mostly 
credited to a very long line in my org file (~100k characters). I 
inserted a snippet from a log file to a quote block, without realizing 
that a large base64 string was hiding at the end of one line.
The old regex could exclude that line early on, because it wasn't a 
header line, so I didn't notice a performance hit back then.

With that line deleted (org file shrinks to ~300KB), I measured 
performance with the new and old regex (new on 1st line vs old on 2nd line):

(elp-instrument-function 'org-font-lock-add-priority-faces)
;; open org file

      Function Name                     Call Count  Elapsed Time Average 
new: org-font-lock-add-priority-faces  28          0.0228787000 0.0008170964
old: org-font-lock-add-priority-faces  28          0.0007937999 2.834...e-05

So the new one is still considerably slower, but probably not noticeable 
unless the file is really large and/or it contains long lines.

One last remark, my workaround from the last mail is flawed, e.g. it 
broke priority sorting in my agendas. This one worked better:

(defun adv--org-font-lock-add-priority-faces (wrapped-func &rest args)
   (let ((org-priority-regexp "^\\*+ .*?\\(\\[#\\([A-Z0-9]+\\)\\] ?\\)"))
     (apply wrapped-func args)))
(advice-add 'org-font-lock-add-priority-faces :around 

       reply	other threads:[~2020-10-07 21:10 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <87bbd664-2da6-0551-25f1-9ff287fed9f2%40mailbox.org>
2020-10-07 21:09 ` Tim Frana [this message]
2020-09-24 12:59 Bug: performance issue in org-font-lock-add-priority-faces related to org-priority-regexp [9.4 (9.4-7-g3eccc5-elpaplus @ /home/standard/.emacs.d/elpa/26.3/develop/org-plus-contrib-20200921/)] Tim Frana

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