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bug#48871: 27.2; Unusably slow in C# mode
From: |
Eli Zaretskii |
Subject: |
bug#48871: 27.2; Unusably slow in C# mode |
Date: |
Sun, 06 Jun 2021 20:00:55 +0300 |
> From: jan <rtm443x@googlemail.com>
> Date: Sun, 6 Jun 2021 15:53:11 +0100
> Cc: 48871@debbugs.gnu.org
>
> I don't recall installing c# but may well have happened.
> >From package-list-packages:
>
> csharp-mode 20210328.2004 installed C# mode derived mode
>
> Which does not say built-in so likely I did. Looking in the unzipped
> emacs 27.2 , no relevant *sharp* file in it, and did find it in the
> elpa directory, so I guess must have.
>
> Started with -Q. Did the M-x load-file for csharp-mode.el (FYI also
> had to do load-file for csharp-compilation.el before that to make it
> happy).
>
> Finally got to load the C# file itself, exactly the same. No faster.
>
> Troublesome C# file attached.
Thanks.
Alan, can you look into this? It could be some problem in
csharp-mode, but the profiler says 97% of the time is spent in a CC
mode code, so maybe you can shed some light on this?
I see that almost the entire 6896-line file is enclosed in a single
"namespace LDB { ... }" block, maybe this is the reason?
Here's the main portion of a profile measured on my system from just
inserting 3 characters at BOB of the file attached by the OP. An
unoptimized build of Emacs 28 took about 2 min(!) to process those 3
self-inserting characters.
8693 98% - command-execute
8693 98% - call-interactively
8693 98% - funcall-interactively
8690 98% - self-insert-command
8627 98% - c-before-change
8627 98% - mapc
8627 98% - #<compiled 0x1aaa1ff2c62de223>
8627 98% - c-before-change-check-unbalanced-strings
8611 97% c-pps-to-string-delim
10 0% - c-syntactic-re-search-forward
2 0% - c-beginning-of-macro
2 0% back-to-indentation
1 0% #<compiled 0x4f47ef635173>
1 0% c-clear-syn-tab
63 0% - c-after-change
- bug#48871: 27.2; Unusably slow in C# mode, jan, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, Eli Zaretskii, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, jan, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, Eli Zaretskii, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, jan, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode,
Eli Zaretskii <=
- bug#48871: 27.2; Unusably slow in C# mode, jan, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, Eli Zaretskii, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, jan, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, Alan Mackenzie, 2021/06/06
- bug#48871: 27.2; Unusably slow in C# mode, jan, 2021/06/09