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From: Alan Mackenzie <acm@muc.de>
To: Dmitry Gutov <dgutov@yandex.ru>
Cc: emacs-devel@gnu.org
Subject: Processing speed in large C++ raw strings.
Date: Thu, 25 Apr 2019 18:36:15 +0000	[thread overview]
Message-ID: <20190425183615.GB19807@ACM> (raw)

Hello, Dmitry.

Some while ago, you were complaining, justifiably, about the
sluggishness when typing characters into very long C++ raw strings.  To
demonstrate this, you put xdisp.c into C++ mode, and put a raw string
round nearly the entire buffer.

Last week, it was taking over 2 seconds to process a single
self-insert-command into this string, and my machine is not slow.

I have now optimized CC Mode, such that each such self-insert-command
now takes around 0.07s-0.1s.  I used two strategies for this: (i) breaking out
of (expensive) fontification routines early, when the region being
fontified is nothing but a string; (ii) Not fontifying the entire raw
string for a change to only a small part of it.

-- 
Alan Mackenzie (Nuremberg, Germany).



             reply	other threads:[~2019-04-25 18:36 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-25 18:36 Alan Mackenzie [this message]
2019-04-26  1:25 ` Processing speed in large C++ raw strings Dmitry Gutov
2019-04-26 20:15 ` Tadeus Prastowo
2019-04-27  2:15   ` Stefan Monnier
2019-04-27 10:37     ` Tadeus Prastowo
2019-04-27 11:37   ` Alan Mackenzie
2019-04-27 15:35     ` Tadeus Prastowo
2019-04-27 17:29       ` Alan Mackenzie
2019-04-30 14:44         ` Tadeus Prastowo

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