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Re: New optimisations for long raw strings in C++ Mode.
From: |
Alan Mackenzie |
Subject: |
Re: New optimisations for long raw strings in C++ Mode. |
Date: |
Sun, 7 Aug 2022 14:40:47 +0000 |
Hello, Lars.
On Sun, Aug 07, 2022 at 15:34:45 +0200, Lars Ingebrigtsen wrote:
> Alan Mackenzie <acm@muc.de> writes:
> > Hmm. Something is different on my setup from yours. After my
> > optimisations, I do:
> Is this on the current trunk?
Yes, after the committing of
commit a332034160bf8e1f38039cd2d37898de6f94508f
Author: Alan Mackenzie <acm@muc.de>
Date: Sun Aug 7 12:26:16 2022 +0000
CC Mode: Fix looping in patch from yesterday
> > (i) Emacs -Q
> > (ii) M-: (setq long-line-threshold nil)
> > (ii) C-x C-f ~/long-line.cc RET; This is a file containing a 1MB raw
> > string.
> > (iii) This loads and displays in somewhere between 1 and 2 seconds.
> > (iv) C-x 5 b long-line2.cc RET M-x c++-mode RET
> > (v) Type in char long_line [] = R"foo(
> > (vi) Type in RET, twice
> > (vii) Type in )foo";
> Yup.
> > (ix) C-x 5 o
> > (x) Get the long line into the kill ring, with movement commands and
> > M-w.
> > (xi) C-x 5 o.
> > (xii) Put point on the blank line 2.
> > (xiii) C-y.
> > (xiv) This takes less than a second to display.
> It's still hanging for me after 20s.
> > What does your 1MB string look like? Does it contain lots of "s? CC
> > Mode needs to search through the yanked line for the first occurrence of
> > )foo", which is why it is not instantaneous. It also has to put a
> > syntax-table text property on each " which isn't the terminating )foo",
> > which is another reason it's not instantaneous.
> The string I'm yanking is just 1MB worth of x and y characters (and no
> spaces or anything).
Mine looked like "012345678 012345678 012345678 .... 012345678 ". I
tried replacing each space by a 9, but the string still yanks with the
expected minimal sluggishness.
Actually, I just tried it again after M-: (setq long-line-threshold
10000). It hangs. Did you omit step (ii) above, by any chance?
--
Alan Mackenzie (Nuremberg, Germany).
- New optimisations for long raw strings in C++ Mode., Alan Mackenzie, 2022/08/06
- Re: New optimisations for long raw strings in C++ Mode., Lars Ingebrigtsen, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode., Alan Mackenzie, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode., Lars Ingebrigtsen, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode.,
Alan Mackenzie <=
- Re: New optimisations for long raw strings in C++ Mode., Lars Ingebrigtsen, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode., Lars Ingebrigtsen, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode., Alan Mackenzie, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode., Eli Zaretskii, 2022/08/07
- Re: New optimisations for long raw strings in C++ Mode., Alan Mackenzie, 2022/08/09
- Re: New optimisations for long raw strings in C++ Mode., Lars Ingebrigtsen, 2022/08/09
- Re: New optimisations for long raw strings in C++ Mode., Lars Ingebrigtsen, 2022/08/09
- Re: New optimisations for long raw strings in C++ Mode., Alan Mackenzie, 2022/08/09
- Re: New optimisations for long raw strings in C++ Mode., Eli Zaretskii, 2022/08/09
- Re: New optimisations for long raw strings in C++ Mode., Gregory Heytings, 2022/08/09