GNU bug report logs - #71454
30.0.50; Performance issues with font selection

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Message #64 received at 71454 <at> debbugs.gnu.org (full text, mbox):

From: Jim Porter <jporterbugs <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>, Kai Ma <justksqsf <at> gmail.com>
Cc: jb <at> jeremybryant.net, 71454 <at> debbugs.gnu.org
Subject: Re: bug#71454: 30.0.50; Performance issues with font selection
Date: Mon, 10 Jun 2024 09:31:53 -0700

On 6/10/2024 4:53 AM, Eli Zaretskii wrote:
> My crystal ball says that the expensive part here is character
> composition.  The above characters belong to scripts that require
> extensive composition rules, take a look at indian.el and its complex
> regexps.

That would show up in a profile, right? Here's what I get when I start 
"emacs -Q", start profiling, and then call "C-h v 
comint-password-prompt-regexp RET". It's not the most interesting 
profile since most of it is probably in C code. I do see 
'auto-compose-chars' in there, however it's got ~0% of the samples from 
the profiler.

I haven't had time to dig into this in any great depth, so this profile 
may of course turn out to be entirely useless...

         910  98% - command-execute
         907  98%  - funcall-interactively
         907  98%   - describe-variable
         907  98%    - help--window-setup
         905  98%     - help-window-setup
           2   0%      - help-window-display-message
           2   0%         auto-compose-chars
           1   0%     - #<compiled 0x14e8696a6b1e2e3f>
           1   0%      - cl-prin1-to-string
           1   0%       - byte-code
           1   0%        - cl-generic-define-method
           1   0%         - cl--generic-make-function
           1   0%          - cl--generic-make-next-function
           1   0%           - cl--generic-get-dispatcher
           1   0%            - byte-compile
           1   0%             - #<subr 
F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_50>
           1   0%                byte-compile-top-level
           1   0%       help-make-xrefs
           3   0%  - byte-code
           2   0%   - read-extended-command
           2   0%    - read-extended-command-1
           2   0%       completing-read-default
           1   0%   - variable-at-point
           1   0%    - find-tag-default
           1   0%       find-tag-default-bounds
          10   1% - ...
           9   0%    Automatic GC
           1   0%  - completion--in-region
           1   0%   - #<compiled -0x68df6976d72fd66>
           1   0%    - apply
           1   0%     - #<compiled -0x1e70b1692b6b395e>
           1   0%      - completion--in-region-1
           1   0%       - completion--do-completion
           1   0%        - completion-try-completion
           1   0%         - completion--nth-completion
           1   0%          - completion--some
           1   0%           - #<compiled 0x3d94d2d3a4c0012>
           1   0%            - completion-basic-try-completion
           1   0%             - completion-boundaries
           1   0%              - help--symbol-completion-table
           1   0%               - help--load-prefixes
           1   0%                - load
           1   0%                   byte-code

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