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Re: The Emacs master is much slower than the emacs-27 branch.
From: |
Eli Zaretskii |
Subject: |
Re: The Emacs master is much slower than the emacs-27 branch. |
Date: |
Sat, 05 Dec 2020 11:05:42 +0200 |
> Date: Sat, 05 Dec 2020 08:14:24 +0000
> From: Gregory Heytings <ghe@sdf.org>
> cc: acm@muc.de, stephen.berman@gmx.net, emacs-devel@gnu.org
>
> >> Sorry, I meant: it only improves compilation with -Og _and -O0_. I
> >> don't know if -O0 is important.
> >
> > Given my measurements (see upthread), the effect on -O0 build is
> > negligible. And yes, -O0 _is_ important.
> >
>
> I don't know what happens on your computer (what is your
> platform/compiler?) but on mine (Debian GNU/Linux with the latest Linux
> kernel and the latest GCC) the effect on -O0 is almost the same as on -Og
> for this particular benchmark. I just tried again on the emacs-27 branch:
>
> -Og: ~67s
> -O0: ~63s
> -O1: ~26s
> -O2: ~18s
> -O3: ~17s
Well, this could be due to the fact that my builds are with
"--enable-checking=yes,glyphs" and --with-wide-int. I wouldn't expect
any of these to have such a profound effect on the difference between
the two branches, though.
To answer your question: this is GCC 9.2.0 on MS-Windows.
In any case, this is not a bug, and doesn't affect the production
code, so making that change on emacs-27 is out of the question.
- Re: The Emacs master is much slower than the emacs-27 branch., (continued)
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Basil L. Contovounesios, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Ergus, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Andrea Corallo, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Gregory Heytings, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Óscar Fuentes, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch.,
Eli Zaretskii <=
- Re: The Emacs master is much slower than the emacs-27 branch., martin rudalics, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Gregory Heytings, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Gregory Heytings, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Óscar Fuentes, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., martin rudalics, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Gregory Heytings, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., martin rudalics, 2020/12/05
- Re: The Emacs master is much slower than the emacs-27 branch., Gregory Heytings, 2020/12/05