From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: emacs-devel@gnu.org
Subject: Re: State of the overlay tree branch?
Date: Mon, 19 Mar 2018 15:02:51 +0200 [thread overview]
Message-ID: <83d100nrpg.fsf@gnu.org> (raw)
In-Reply-To: <jwvvadsz2nm.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Mon, 19 Mar 2018 08:29:40 -0400)
> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Cc: emacs-devel@gnu.org
> Date: Mon, 19 Mar 2018 08:29:40 -0400
>
> > But I don't believe [display_count_lines] could be orders of
> > magnitude faster than count-lines, even though it doesn't need to
> > convert character position to byte position.
>
> Scanning from the last used position can be *very* different from
> scanning from point-min. So yes, it can be orders of magnitude faster
Well, in my measurements it's already very fast. I don't understand
why the OP sees times that are 10 times slower.
> The
>
> for (tail = BUF_MARKERS (b); tail; tail = tail->next)
>
> loop in buf_charpos_to_bytepos and buf_bytepos_to_charpos.
>
> > But find_newline doesn't look for markers, and it converts character
> > to byte position just 2 times. Or am I missing something?
>
> The idea is that the above loop (even if called only twice) might be
> sufficient to make line-number-at-pos take 0.2s.
I very much doubt that loop could take such a long time. And running
a benchmark 1000 times means that the 2nd through 1000th iteration
find the mapping much faster, probably bypassing the loop entirely.
> So for them to cause the slow down seen here, we'd need not only
> a very large number of markers but also additional conditions that might
> not be very likely.
> But it's still a possibility.
I'll believe it when I see it.
next prev parent reply other threads:[~2018-03-19 13:02 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <<c24f8534-5245-026e-da18-f6be7b9702bf@arkona-technologies.de>
[not found] ` <<834lldp18f.fsf@gnu.org>
2018-03-18 21:37 ` State of the overlay tree branch? Drew Adams
2018-03-19 1:33 ` Stefan Monnier
2018-03-19 6:50 ` Eli Zaretskii
2018-03-19 12:29 ` Stefan Monnier
2018-03-19 13:02 ` Eli Zaretskii [this message]
2018-03-19 13:43 ` Stefan Monnier
2018-03-19 14:28 ` Eli Zaretskii
2018-03-19 14:39 ` Stefan Monnier
2018-03-19 6:33 ` Eli Zaretskii
2018-03-18 20:14 Sebastian Sturm
2018-03-18 20:39 ` Eli Zaretskii
2018-03-18 21:04 ` Sebastian Sturm
2018-03-18 23:03 ` Sebastian Sturm
2018-03-18 23:20 ` Sebastian Sturm
2018-03-19 6:43 ` Eli Zaretskii
2018-03-19 9:53 ` Sebastian Sturm
2018-03-19 12:57 ` Eli Zaretskii
2018-03-19 14:56 ` Stefan Monnier
2018-03-19 15:07 ` Sebastian Sturm
2018-03-19 15:13 ` Stefan Monnier
2018-03-20 1:23 ` Sebastian Sturm
2018-03-20 6:30 ` Eli Zaretskii
2018-03-21 0:36 ` Sebastian Sturm
2018-03-21 6:47 ` Eli Zaretskii
2018-03-22 13:16 ` Stefan Monnier
2018-03-22 19:54 ` Sebastian Sturm
2018-03-22 20:04 ` Sebastian Sturm
2018-03-22 20:52 ` Stefan Monnier
2018-03-22 23:11 ` Sebastian Sturm
2018-03-23 5:03 ` Stefan Monnier
2018-03-23 12:25 ` Sebastian Sturm
2018-03-23 12:47 ` Eli Zaretskii
2018-03-23 13:19 ` Stefan Monnier
2018-03-23 13:37 ` Noam Postavsky
2018-03-23 13:55 ` Stefan Monnier
2018-03-23 14:22 ` Eli Zaretskii
2018-03-23 14:39 ` Stefan Monnier
2018-03-23 19:39 ` Stefan Monnier
2018-03-25 15:11 ` Stefan Monnier
2018-03-25 16:39 ` Eli Zaretskii
2018-03-25 17:35 ` Stefan Monnier
2018-03-23 8:07 ` Eli Zaretskii
2018-03-23 9:08 ` Eli Zaretskii
2018-03-23 10:15 ` Sebastian Sturm
2018-03-23 12:39 ` Eli Zaretskii
2018-03-23 12:12 ` Stefan Monnier
2018-03-23 12:40 ` Eli Zaretskii
2018-03-23 12:55 ` Stefan Monnier
2018-03-19 6:36 ` Eli Zaretskii
2018-03-19 6:28 ` Eli Zaretskii
2018-03-21 14:14 ` Sebastien Chapuis
2018-03-21 15:35 ` Eli Zaretskii
2018-03-26 13:06 ` Stefan Monnier
2018-03-27 20:59 ` Sebastian Sturm
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