From: Thomas Lord <lord@emf.net>
To: rms@gnu.org
Cc: acm@muc.de, emacs-devel@gnu.org, bob@rattlesnake.com
Subject: Re: Release plans
Date: Mon, 01 Sep 2008 11:09:04 -0700 [thread overview]
Message-ID: <48BC2FC0.90001@emf.net> (raw)
In-Reply-To: <E1Ka2dL-0005FS-S7@fencepost.gnu.org>
Richard M. Stallman wrote:
> The string representation is based on splay trees: a string
> is a splay tree of gap buffers. There are various invariants
> (that I won't get into here) that make these trees more than
> ordinary splay trees -- they are a new data structure (afaict).
>
> It will not be easy to determine whether this is a better data
> structure for Emacs, even given a full implementation of it. Even if
> we had Emacs working using this, it might be hard to tell whether that
> was an improvement. For instance, many operations might be faster in
> some cases, and slower in other cases.
>
There is no need to make any decisions in advance.
I'm not worried about whether or not the code proves out
for GNU Emacs because I am certain I have plenty of uses
for it other than that. It might well be good in Emacs.
The design is certainly influenced by Emacs' design and
experience.
It can be hard to compare things like this, I agree.
> I also worry that it will be harder for most developers to understand
> and change -- or even to use. For instance, making redisplay operate
> on that data structure could be very hard for that reason.
>
I don't see any reason that code would *need* to change.
It might be *desirable* to change redisplay code if simplifications
became possible, or interesting new capabilities. I don't
see anything that would *need* to change there.
> I don't think we would want to implement undo by making a snapshot,
> even if the data makes snapshots possible, because this would take up
> a lot more space than the current undo data. Snapshots might be useful
> for something, but not for this.
>
You misunderstand how it works. To illustrate:
buffer_contents = [some big string];
saved_undo_point = copy (buffer_contents);
buffer_contents = insert (buffer_contents, "foobar");
After that code, there are two strings floating around:
buffer_contents and saved_undo_point.
The two strings differ by the insertion of "foobar" into
buffer_contents (or, if you like, the deletion of "foobar"
from saved_undo_point).
Internally, the two strings share most of their state.
The total amount of memory used is (roughly speaking)
the memory for saved_undo_point plus the memory
for just the string "foobar".
So, it is almost exactly the same space consumption
as an undo list.
(In reality, it's a little bit fancier than what is
described above in order to put an upper bound on
the amount of fragmentation of strings in memory.)
-t
>
>
next prev parent reply other threads:[~2008-09-01 18:09 UTC|newest]
Thread overview: 338+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-12 14:34 Release plans A Soare
2008-08-12 14:52 ` Lennart Borgman (gmail)
2008-08-12 17:14 ` Alan Mackenzie
2008-08-13 6:26 ` Richard M. Stallman
2008-08-13 9:20 ` Alan Mackenzie
2008-08-14 5:19 ` Richard M. Stallman
2008-08-14 8:38 ` Alan Mackenzie
2008-08-14 9:33 ` Johannes Weiner
2008-08-14 9:49 ` Alfred M. Szmidt
2008-08-14 10:04 ` Johannes Weiner
2008-08-14 10:30 ` Alan Mackenzie
2008-08-14 11:07 ` Johannes Weiner
2008-08-14 11:44 ` Tassilo Horn
2008-08-14 12:27 ` Johannes Weiner
2008-08-15 12:45 ` Richard M. Stallman
2008-08-14 12:39 ` Alan Mackenzie
2008-08-14 13:15 ` Johannes Weiner
2008-08-14 13:28 ` Alan Mackenzie
2008-08-14 13:41 ` Johannes Weiner
2008-08-14 17:08 ` Stephen J. Turnbull
2008-08-14 14:30 ` Gilaras Drakeson
2008-08-14 18:00 ` Stephen J. Turnbull
2008-08-15 12:45 ` Richard M. Stallman
2008-08-15 14:18 ` Alan Mackenzie
2008-08-15 17:54 ` Stephen J. Turnbull
2008-08-15 12:45 ` Richard M. Stallman
2008-08-15 16:29 ` Johannes Weiner
2008-08-16 10:40 ` Richard M. Stallman
2008-08-14 10:37 ` Alfred M. Szmidt
2008-08-14 11:24 ` Johannes Weiner
2008-08-14 12:54 ` Alfred M. Szmidt
2008-08-14 13:31 ` Johannes Weiner
2008-08-14 14:02 ` Alfred M. Szmidt
2008-08-14 16:55 ` Stephen J. Turnbull
2008-08-15 12:45 ` Richard M. Stallman
2008-08-16 1:41 ` Lennart Borgman (gmail)
2008-08-17 7:16 ` Richard M. Stallman
2008-08-15 3:41 ` Richard M. Stallman
2008-08-15 4:04 ` Sean O'Rourke
2008-08-15 20:12 ` Michael Ekstrand
2008-08-15 5:08 ` Johannes Weiner
2008-08-16 0:08 ` Richard M. Stallman
2008-08-16 5:14 ` Johannes Weiner
2008-08-15 17:20 ` Thomas Lord
2008-08-16 10:39 ` Richard M. Stallman
2008-08-16 12:05 ` joakim
2008-08-17 7:16 ` Richard M. Stallman
2008-08-17 9:32 ` joakim
2008-08-18 6:14 ` Richard M. Stallman
2008-08-18 7:19 ` Tassilo Horn
2008-08-18 8:03 ` Stefan Monnier
2008-08-18 8:26 ` joakim
2008-08-19 12:21 ` Richard M. Stallman
2008-08-19 13:02 ` Johannes Weiner
2008-08-20 3:47 ` Richard M. Stallman
2008-08-20 5:20 ` Johannes Weiner
2008-08-19 13:42 ` Tassilo Horn
2008-08-20 3:48 ` Richard M. Stallman
2008-08-18 14:20 ` Gilaras Drakeson
2008-08-18 17:13 ` Stephen J. Turnbull
2008-08-18 17:42 ` Paul R
2008-08-19 12:21 ` Richard M. Stallman
2008-08-20 0:01 ` Stephen J. Turnbull
2008-08-21 23:09 ` Richard M. Stallman
2008-08-22 0:34 ` whither GNU Thomas Lord
2008-08-22 0:17 ` Juanma Barranquero
2008-08-22 3:40 ` David Robinow
2008-08-22 7:36 ` Johannes Weiner
2008-08-23 5:09 ` Richard M. Stallman
2008-08-22 10:21 ` Juanma Barranquero
2008-08-22 21:31 ` Thomas Lord
[not found] ` <858wuoad0u.fsf@lola.goethe.zz>
2008-08-23 4:56 ` Thomas Lord
2008-08-16 16:29 ` Release plans Stephen J. Turnbull
2008-08-16 21:04 ` Thomas Lord
2008-08-16 21:35 ` Alan Mackenzie
2008-08-16 22:43 ` Stephen J. Turnbull
2008-08-17 7:31 ` Alan Mackenzie
2008-08-18 0:01 ` Stephen J. Turnbull
2008-08-18 10:18 ` Alan Mackenzie
2008-08-18 17:58 ` Stephen J. Turnbull
2008-08-18 20:20 ` Dynamic loading (was: Release plans) Stefan Monnier
2008-08-18 22:18 ` Stephen J. Turnbull
2008-08-20 16:15 ` Dynamic loading Stefan Monnier
2008-08-20 16:57 ` joakim
2008-08-25 13:09 ` Stephen J. Turnbull
2008-08-26 16:37 ` Richard M. Stallman
2008-08-18 21:09 ` Release plans Alan Mackenzie
2008-08-18 23:27 ` Johannes Weiner
2008-08-19 10:23 ` Alan Mackenzie
2008-08-19 11:56 ` Johannes Weiner
2008-08-19 9:46 ` Stephen J. Turnbull
2008-08-19 12:36 ` Robert J. Chassell
2008-08-20 5:55 ` Stephen J. Turnbull
2008-08-20 17:48 ` Robert J. Chassell
2008-08-25 1:34 ` Stephen J. Turnbull
2008-08-25 10:47 ` Robert J. Chassell
2008-08-25 13:13 ` Stephen J. Turnbull
2008-08-25 15:19 ` Robert J. Chassell
2008-08-25 17:11 ` Thomas Lord
2008-08-26 4:10 ` Stephen J. Turnbull
2008-08-26 10:59 ` Robert J. Chassell
2008-08-27 5:00 ` Stephen J. Turnbull
2008-08-27 11:37 ` Robert J. Chassell
2008-08-28 5:42 ` Stephen J. Turnbull
2008-08-28 10:17 ` Robert J. Chassell
2008-08-26 16:37 ` Richard M. Stallman
2008-08-26 18:14 ` Thomas Lord
2008-08-27 18:54 ` Richard M. Stallman
2008-08-27 20:33 ` Paul R
2008-08-29 2:41 ` Richard M. Stallman
2008-08-29 5:34 ` Thomas Lord
2008-08-29 11:39 ` Bruce Stephens
2008-08-29 13:11 ` Lennart Borgman (gmail)
2008-08-29 19:23 ` Thomas Lord
2008-08-29 20:03 ` Thien-Thi Nguyen
2008-08-29 20:20 ` Stefan Monnier
2008-08-29 20:53 ` Lennart Borgman (gmail)
2008-08-29 23:24 ` Thomas Lord
2008-08-29 22:56 ` Thomas Lord
2008-08-30 19:51 ` Thien-Thi Nguyen
2008-08-30 23:07 ` Thomas Lord
2008-08-31 9:09 ` Thien-Thi Nguyen
2008-08-29 22:53 ` Thomas Lord
2008-08-31 9:27 ` Thien-Thi Nguyen
2008-08-29 19:13 ` Thomas Lord
2008-08-29 23:48 ` Richard M. Stallman
2008-09-01 6:11 ` Richard M. Stallman
2008-09-01 18:25 ` Thomas Lord
2008-08-27 22:32 ` Thomas Lord
2008-08-27 21:57 ` Alfred M. Szmidt
2008-08-28 0:10 ` Thomas Lord
2008-08-29 2:40 ` Richard M. Stallman
2008-08-29 5:30 ` Thomas Lord
2008-08-27 22:09 ` Alan Mackenzie
2008-08-28 1:10 ` Thomas Lord
2008-09-01 6:11 ` Richard M. Stallman
2008-09-01 18:09 ` Thomas Lord [this message]
2008-09-02 1:09 ` Richard M. Stallman
2008-09-02 2:18 ` Thomas Lord
2008-09-02 14:13 ` Richard M. Stallman
2008-09-02 20:48 ` Thomas Lord
2008-09-01 18:20 ` Stefan Monnier
2008-09-01 20:17 ` Thomas Lord
2008-09-01 19:53 ` Stefan Monnier
2008-09-01 21:23 ` Thomas Lord
2008-09-02 3:26 ` Stephen J. Turnbull
2008-09-02 20:43 ` Thomas Lord
2008-09-03 5:08 ` Stephen J. Turnbull
2008-08-27 23:09 ` Lennart Borgman (gmail)
2008-08-28 0:22 ` Thomas Lord
2008-08-28 1:01 ` Lennart Borgman (gmail)
2008-08-26 21:25 ` joakim
2008-08-29 2:41 ` Richard M. Stallman
2008-08-19 15:52 ` Alan Mackenzie
2008-08-25 14:39 ` Stephen J. Turnbull
2008-08-25 22:01 ` Alan Mackenzie
2008-08-25 22:19 ` Lennart Borgman (gmail)
2008-08-26 4:54 ` Stephen J. Turnbull
2008-08-26 7:16 ` ["agree"] " Thomas Lord
2008-08-27 5:10 ` Stephen J. Turnbull
2008-08-27 16:00 ` Thomas Lord
2008-08-26 10:02 ` Alan Mackenzie
2008-08-27 5:38 ` Stephen J. Turnbull
2008-08-27 21:06 ` Alan Mackenzie
2008-08-27 21:12 ` Lennart Borgman (gmail)
2008-08-28 20:01 ` Sean Sieger
2008-08-28 6:07 ` Stephen J. Turnbull
2008-08-27 15:57 ` Thien-Thi Nguyen
2008-08-27 18:33 ` tomas
2008-08-28 6:09 ` Stephen J. Turnbull
2008-08-28 8:14 ` tomas
2008-08-28 7:25 ` Alan Mackenzie
2008-08-28 8:23 ` tomas
2008-08-28 6:26 ` Stephen J. Turnbull
2008-08-19 16:31 ` Thomas Lord
2008-08-20 3:47 ` Richard M. Stallman
2008-08-20 6:14 ` Stephen J. Turnbull
2008-08-19 12:21 ` Richard M. Stallman
2008-08-19 13:04 ` Paul R
2008-08-20 3:48 ` Richard M. Stallman
2008-08-17 2:37 ` Thomas Lord
2008-08-17 8:01 ` Alan Mackenzie
2008-08-17 17:42 ` Thomas Lord
2008-08-17 21:07 ` Alan Mackenzie
2008-08-17 21:24 ` Johannes Weiner
2008-08-17 21:33 ` Alfred M. Szmidt
2008-08-17 22:31 ` Johannes Weiner
2008-08-18 3:06 ` Thomas Lord
2008-08-18 6:14 ` Richard M. Stallman
2008-08-17 21:45 ` Thien-Thi Nguyen
2008-08-18 6:14 ` Richard M. Stallman
2008-08-18 17:09 ` Thomas Lord
2008-08-19 16:28 ` René Kyllingstad
2008-08-20 3:48 ` Richard M. Stallman
2008-08-17 7:16 ` Richard M. Stallman
2008-08-15 3:41 ` Richard M. Stallman
2008-08-15 17:17 ` Thomas Lord
2008-08-16 10:40 ` Richard M. Stallman
2008-08-16 7:14 ` Alfred M. Szmidt
2008-08-14 17:24 ` Stefan Monnier
2008-08-15 3:41 ` Richard M. Stallman
2008-08-15 14:04 ` Alan Mackenzie
2008-08-15 15:10 ` [OT] " Yavor Doganov
2008-08-16 7:05 ` Miles Bader
2008-08-17 7:16 ` Richard M. Stallman
2008-08-15 16:35 ` Stephen J. Turnbull
2008-08-15 18:07 ` Thomas Lord
2008-08-16 10:40 ` Richard M. Stallman
2008-08-16 10:40 ` Richard M. Stallman
-- strict thread matches above, loose matches on Subject: below --
2008-08-14 15:36 Robert J. Chassell
2008-08-14 15:51 ` Johannes Weiner
2008-08-14 21:00 ` Robert J. Chassell
2008-08-14 22:58 ` Johannes Weiner
[not found] <SRV-ADEXCHyjlMFAVNL0000090e@waccglobal.org>
2008-08-13 14:07 ` Mike Rowse
2008-08-13 1:30 A Soare
2008-08-12 20:51 A Soare
2008-08-12 21:35 ` Lennart Borgman (gmail)
2008-08-12 20:16 christophe
2008-08-12 18:57 A Soare
2008-08-12 18:54 A Soare
2008-08-12 18:58 ` Lennart Borgman (gmail)
2008-08-12 18:41 A Soare
2008-08-12 18:46 ` Lennart Borgman (gmail)
2008-08-12 18:55 ` Eli Zaretskii
2008-08-12 18:38 A Soare
2008-08-12 18:36 A Soare
2008-08-12 18:04 A Soare
2008-08-12 18:21 ` Lennart Borgman (gmail)
2008-08-12 18:25 ` Lennart Borgman (gmail)
2008-08-12 15:34 A Soare
2008-08-12 15:59 ` Lennart Borgman (gmail)
2008-08-12 13:51 A Soare
2008-08-12 13:37 A Soare
2008-08-12 13:50 ` martin rudalics
2008-08-12 17:16 ` Johannes Weiner
2008-08-12 14:02 ` Lennart Borgman (gmail)
2008-08-12 14:54 ` Paul R
2008-08-12 18:37 ` Eli Zaretskii
2008-08-12 19:16 ` Óscar Fuentes
2008-08-12 19:41 ` Paul R
2008-08-12 13:11 A Soare
2008-08-12 13:20 ` Juanma Barranquero
2008-08-12 15:54 ` Johannes Weiner
2008-08-13 6:26 ` Richard M. Stallman
2008-08-13 7:05 ` Johannes Weiner
2008-08-12 13:24 ` Lennart Borgman (gmail)
2008-08-12 12:21 A Soare
2008-08-12 12:33 ` Lennart Borgman (gmail)
2008-08-12 13:42 ` Michael Ekstrand
2008-08-13 6:27 ` Richard M. Stallman
2008-08-13 7:14 ` Alex Ott
2008-08-12 14:45 ` Miles Bader
2008-08-12 14:56 ` Lennart Borgman (gmail)
2008-08-12 16:47 ` Drew Adams
2008-08-13 20:20 ` Richard M. Stallman
2008-08-12 18:34 ` Eli Zaretskii
2008-08-05 2:53 dhruva
2008-08-05 4:43 ` tomas
2008-08-05 21:48 ` Richard M. Stallman
2008-07-31 9:54 dhruva
2008-07-31 22:01 ` Richard M Stallman
2008-07-30 9:58 dhruva
2008-07-31 1:59 ` Richard M Stallman
2008-07-31 9:30 ` Alan Mackenzie
2008-07-31 22:01 ` Richard M Stallman
2008-08-01 14:15 ` Frank Schmitt
2008-08-01 14:51 ` Miles Bader
2008-08-02 5:12 ` Richard M Stallman
2008-08-02 7:20 ` Frank Schmitt
2008-08-03 1:33 ` Richard M. Stallman
2008-08-03 11:38 ` Juanma Barranquero
2008-08-03 22:42 ` Richard M. Stallman
2008-08-03 23:16 ` Juanma Barranquero
2008-08-04 15:55 ` Davi Leal
2008-08-05 21:48 ` Richard M. Stallman
2008-08-12 4:48 ` Thomas Lord
2008-08-12 7:30 ` Miles Bader
2008-08-12 15:37 ` Thomas Lord
2008-08-12 10:32 ` Richard M. Stallman
2008-08-12 16:08 ` Thomas Lord
2008-08-13 20:20 ` Richard M. Stallman
2008-08-03 13:48 ` Nic
2008-08-03 22:42 ` Richard M. Stallman
2008-08-01 15:31 ` Alan Mackenzie
2008-08-02 5:12 ` Richard M Stallman
2008-08-02 17:12 ` Alan Mackenzie
2008-08-02 23:46 ` Lennart Borgman (gmail)
2008-08-03 1:33 ` Richard M. Stallman
2008-08-03 18:01 ` Alan Mackenzie
2008-08-04 15:33 ` Richard M. Stallman
2008-08-12 4:24 ` Thomas Lord
2008-08-12 10:32 ` Richard M. Stallman
2008-08-12 16:12 ` Thomas Lord
2008-08-03 1:33 ` Richard M. Stallman
2008-08-03 17:51 ` Alan Mackenzie
2008-08-04 15:33 ` Richard M. Stallman
2008-08-04 19:08 ` Alan Mackenzie
2008-08-05 8:05 ` Richard M. Stallman
2008-08-01 17:39 ` Davi Leal
2008-08-02 5:12 ` Richard M Stallman
2008-07-14 15:07 Chong Yidong
2008-07-17 0:27 ` Juri Linkov
2008-07-17 6:41 ` David Kastrup
2008-07-21 4:49 ` Chong Yidong
2008-07-21 8:06 ` Thien-Thi Nguyen
2008-07-21 13:32 ` Chong Yidong
2008-07-21 14:19 ` Thien-Thi Nguyen
2008-07-23 20:52 ` Michael Albinus
2008-07-23 21:42 ` Chong Yidong
2008-07-26 7:39 ` Eli Zaretskii
2008-07-26 21:33 ` Richard M Stallman
2008-07-27 3:22 ` Eli Zaretskii
2008-07-27 17:14 ` Richard M Stallman
2008-07-27 19:14 ` Eli Zaretskii
2008-07-28 21:46 ` Richard M Stallman
2008-07-29 3:12 ` Eli Zaretskii
2008-07-30 3:47 ` Richard M Stallman
2008-07-30 17:33 ` Eli Zaretskii
2008-07-28 13:43 ` Juri Linkov
2008-07-28 14:10 ` Chong Yidong
2008-07-28 14:33 ` Juri Linkov
2008-07-29 17:11 ` Chong Yidong
2008-07-29 17:54 ` Stefan Monnier
2008-07-29 15:21 ` Roland Winkler
2008-08-02 17:34 ` Eli Zaretskii
2008-08-09 18:29 ` Eli Zaretskii
2008-08-09 18:34 ` Juanma Barranquero
2008-08-09 19:06 ` Eli Zaretskii
2008-07-31 2:10 ` Bastien
2008-07-31 2:43 ` Chong Yidong
2008-07-31 8:06 ` Lennart Borgman (gmail)
2008-08-01 2:53 ` Bastien
2008-08-01 19:26 ` Jay Belanger
2008-08-01 19:32 ` Chong Yidong
2008-08-02 16:12 ` Jay Belanger
2008-08-02 4:08 ` Stephen J. Turnbull
2008-08-02 17:30 ` Richard M Stallman
2008-08-05 4:04 ` Bill Wohler
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