From: martin rudalics <rudalics@gmx.at>
To: Alan Mackenzie <acm@muc.de>, emacs-devel@gnu.org
Subject: Re: Scrolling xdisp.c. Room for optimisation in syntax.c/CC Mode.
Date: Mon, 20 Oct 2014 09:29:51 +0200 [thread overview]
Message-ID: <5444B9EF.4050506@gmx.at> (raw)
In-Reply-To: <20141018202839.GB5924@acm.acm>
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Results for Windows XP with CPPFLAGS='-DGLYPH_DEBUG=1' CFLAGS='-O0 -g3'
--enable-checking=yes --enable-check-lisp-object-type=yes:
Unmodified xdisp.c from trunk:
24.3 1007 scrolls, total time = 105.60900020599365s.
24.4 1007 scrolls, total time = 73.21900010108948s.
25.0 1007 scrolls, total time = 318.5629997253418s.
xdisp.c from trunk with odd apostrophes eradicated:
24.3 1007 scrolls, total time = 100.1240005493164s.
24.4 1007 scrolls, total time = 60.13900017738342s.
25.0 1007 scrolls, total time = 197.95300006866455s.
I can't test with older versions since those don't have
`scroll-down-command' here.
So while it might be worthwhile to do such an optimization, here the
great differenece is the 3-to-5-fold increase of execution time from
24.4 to 25.0 for which I don't have an explanation. The cc-mode used is
always the one bundled with the respective Emacs version.
martin
BTW, if you want to quickly visualize constructs like
(defconst odd-apostrophes
"/\\*\\([^*']\\|\\*+[^*'/]\\)*\\(\\**'\\([^*']\\|\\*+[^*'/]\\)*\\**'\\([^*']\\|\\*+[^*'/]\\)*\\)*\\**\\('\\)\\([^*']\\|\\*+[^*'/]\\)*\\*+/"
)
without adding comments like
;; 1 2 3 4 5 6
you can use the regexp-lock.el package I attached here ;-)
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next prev parent reply other threads:[~2014-10-20 7:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-18 18:19 Scrolling xdisp.c. Room for optimisation in syntax.c/CC Mode Alan Mackenzie
2014-10-18 20:28 ` Alan Mackenzie
2014-10-19 16:37 ` Ulrich Mueller
2014-10-19 17:49 ` Eli Zaretskii
2014-10-19 18:05 ` Ulrich Mueller
2014-10-20 1:41 ` Stefan Monnier
2014-10-20 7:24 ` Ulrich Mueller
2014-10-20 15:45 ` Stefan Monnier
2014-10-20 16:55 ` Ulrich Mueller
2014-10-20 7:29 ` martin rudalics [this message]
2014-10-20 11:47 ` Alan Mackenzie
2014-10-20 12:05 ` martin rudalics
2014-10-20 12:22 ` Óscar Fuentes
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