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From: Eli Zaretskii <eliz@gnu.org>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: emacs-devel@gnu.org
Subject: Re: Long lines and bidi
Date: Fri, 08 Feb 2013 18:52:06 +0200	[thread overview]
Message-ID: <83y5ey7npl.fsf@gnu.org> (raw)
In-Reply-To: <51152A00.6070101@yandex.ru>

> Date: Fri, 08 Feb 2013 20:38:24 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> CC: emacs-devel@gnu.org
> 
> On 02/08/2013 06:46 PM, Eli Zaretskii wrote:
> 
> > Btw, if you are serious about finding a solution to the long-line
> > display misfeature (or any other too-slow redisplay situation), I
> > generally find it necessary to do precision timing of the suspicious
> > parts of code, because otherwise it is impossible to find the actual
> > culprits.  On GNU/Linux, I use the following simple function:
> 
> Ah, please, there is a difference between 2013 and 1980.

Sorry, you lost me here.

> 1) perf record -e stalled-cycles-frontend -e stalled-cycles-backend -F 10000 [workload]
> 2) perf report --stdio ==>
> 
> 25.18%        emacs  emacs                          [.] scan_buffer
>   7.04%        emacs  emacs                          [.] bidi_resolve_weak

That's why testing redisplay on buffers which are predominantly
punctuation will give you unrealistic measurements.  (If you want to
understand why, read UAX#9.)

> So, ~90% of time spent in scan_buffer is:
> 
> 799                while (*cursor != target && --cursor >= ceiling_addr)
> 800                  ;

Which cannot be optimized.



  reply	other threads:[~2013-02-08 16:52 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-03 22:05 bug#13623: 24.3.50; Redisplay issue with transient-mark-mode Lawrence Mitchell
2013-02-04 15:49 ` Eli Zaretskii
2013-02-04 17:20   ` Lawrence Mitchell
2013-02-04 18:10     ` Eli Zaretskii
2013-02-05  4:54   ` Dmitry Antipov
2013-02-05 12:07     ` Dmitry Antipov
2013-02-05 17:46       ` Eli Zaretskii
2013-02-05 17:45     ` Eli Zaretskii
2013-02-06  7:16       ` Dmitry Antipov
2013-02-06 14:31         ` Stefan Monnier
2013-02-06 15:14           ` Dmitry Antipov
2013-02-06 18:04             ` Eli Zaretskii
2013-02-06 18:23             ` Eli Zaretskii
2013-02-06 20:30               ` Stefan Monnier
2013-02-07  3:41                 ` Eli Zaretskii
2013-02-08 13:33               ` Long lines and bidi [Was: Re: bug#13623: ...] Dmitry Antipov
2013-02-08 14:07                 ` Eli Zaretskii
2013-02-08 14:46                   ` Long lines and bidi Eli Zaretskii
2013-02-08 16:38                     ` Dmitry Antipov
2013-02-08 16:52                       ` Eli Zaretskii [this message]
2013-02-09  3:34                         ` Paul Eggert
2013-02-09  8:46                           ` Eli Zaretskii
2013-02-09  9:05                             ` Paul Eggert
2013-02-09  9:33                               ` Eli Zaretskii
2013-02-11  2:33                                 ` Paul Eggert
2013-02-09 10:01                               ` Eli Zaretskii
2013-02-10 16:57                                 ` Eli Zaretskii
2013-02-11  5:43                                   ` Dmitry Antipov
2013-02-11  7:54                                     ` Dmitry Antipov
2013-02-11 16:47                                       ` Eli Zaretskii
2013-02-11 23:55                                         ` Paul Eggert
2013-02-11 16:42                                     ` Eli Zaretskii
2013-02-11 17:53                                       ` Dmitry Antipov
2013-02-11 18:10                                         ` Eli Zaretskii
2013-02-11 18:21                                           ` Dmitry Antipov
2013-02-11 17:17                                   ` Eli Zaretskii
2013-02-11 17:55                                     ` Drew Adams
2013-02-11 18:13                                       ` Eli Zaretskii
2013-02-08 16:21                   ` Long lines and bidi [Was: Re: bug#13623: ...] Dmitry Antipov
2013-02-08 17:04                     ` Eli Zaretskii
2013-02-08 15:33                 ` Stefan Monnier
2013-02-08 16:05                   ` Eli Zaretskii

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