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Subject: |
c-ts-mode is slow with large buffers. |
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Date: |
Thu, 1 Dec 2022 11:50:05 +0000 |
Hello, Emacs.
In an up to date (2022-11-30) master started as $ emacs --no-desktop:
The file .../drivers/gpu/drm/amd/include/asic_reg/dce/dce_12_0_sh_mask.h
in the Linux source tree is 6.8 MB big, consisting of a large number of
#defines and comments, but nothing else.
To scroll through it in c-ts-mode takes a little over 26 minutes on my
system. By comparison, in C Mode it takes 31 seconds. There would
appear to be a need for some optimisation in c-ts-mode, here.
The file
https://gitlab.com/wireshark/wireshark/-/raw/master/epan/dissectors/packet-rrc.c
(see bug #45248) (10 MB) takes 578 seconds to scroll in c-ts-mode. It
scrolls through the first 83% of the buffer rapidly, then chokes on a big
brace block initialisation. Also, the font-locking fails part way
through this brace block (without any apparent speed up).
For comparison, the scrolling takes 30 seconds in C Mode. There seems to
be a need for optimisation of c-ts-mode in this case, too.
For completeness, I used M-: (time-scroll) in the following for the
timings:
(defmacro time-it (&rest forms)
"Time the running of a sequence of forms using `float-time'.
Call like this: \"M-: (time-it (foo ...) (bar ...) ...)\"."
`(let ((start (float-time)))
,@forms
(- (float-time) start)))
(defun time-scroll (&optional arg)
(interactive "P")
(message "%s"
(time-it
(condition-case nil
(while t
(if arg (scroll-down) (scroll-up))
(sit-for 0))
(error nil)))))
--
Alan Mackenzie (Nuremberg, Germany).
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--- Begin Message ---
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Subject: |
Re: bug#59738: c-ts-mode is slow with large buffers. |
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Date: |
Sat, 7 Jan 2023 15:08:27 -0800 |
Stefan Kangas <stefankangas@gmail.com> writes:
> Alan Mackenzie <acm@muc.de> writes:
>
>> The bug which was causing it to be very slow is fixed, so I agree,
>> excellent job!
>
> Could this bug therefore be closed, or is there more to do here?
This probably can be closed, so I’m closing it.
Yuan
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