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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: A proposal for the future of
 open-paren-in-column-0-is-defun-start.
Date: Tue, 07 Apr 2020 17:06:34 +0300
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Cc: acm@muc.de, emacs-devel@gnu.org, monnier@iro.umontreal.ca, rms@gnu.org
To: martin rudalics <rudalics@gmx.at>
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In-Reply-To: <dbce9069-1f97-9c5d-fb68-d4db48360d5d@gmx.at> (message from
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> Cc: acm@muc.de, rms@gnu.org, emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Tue, 7 Apr 2020 10:33:58 +0200
> 
>  > Actually, we had a few detailed profiles posted which show many levels
>  > below "somewhere in jit-lock", at least for CC Mode.
> 
> When comparing -O0 with -O3 builds I noticed one additional difference
> with simple repetitions of 'scroll-up' in xdisp.c.  The optimized build
> spent 25% of the CPU time consumed collecting garbage, the debug build
> 42%.  Does an -O0 build produce more garbage or is it collecting slower?

I think the latter.  I don't think --enable-checking causes
significantly more Lisp object to be produced.  GC is very recursive,
so optimizations that put variables in registers make it faster.