From: "Stephen J. Turnbull" <stephen@xemacs.org>
To: Dmitry Gutov <dgutov@yandex.ru>
Cc: emacs-devel@gnu.org
Subject: Re: /srv/bzr/emacs/emacs-24 r111116: eval-after-load fix
Date: Fri, 04 Jan 2013 19:58:43 +0900 [thread overview]
Message-ID: <87sj6hb4f0.fsf@uwakimon.sk.tsukuba.ac.jp> (raw)
In-Reply-To: <50E669D2.6030808@yandex.ru>
Dmitry Gutov writes:
> On 03.01.2013 7:27, Stephen J. Turnbull wrote:
> > Glenn Morris writes:
> >
> > > Maybe. (Personally, I doubt any of these purecopy calls have any
> > > non-negligible effect.)
> >
> > FWIW, XEmacs did away with purespace ages ago with no complaints from
> > anybody. (We still have `purecopy' for API compatibility with Emacs,
> > but it's a no-op now.)
> >
> > That's damning with faint praise, of course, but it's a data point.
>
> Is it really faint, though?
Yes, it is faint. I have no numbers on comparative performance in
speed or size, and I wouldn't be surprised if it increases total
memory usage for some multi-xemacs-process cases (see Andreas's post).
The arguments that killed purespace for us were (1) most users
(including most of those who argued for keeping purespace :-) are in
one-xemacs-process-per-machine workflows, and (2) in theory modern
virtual memory management by OSes (we were specifically influenced by
Linux and Windows) should produce most of the benefits of purespace
anyway, since the dumped code contains only a few writable objects,
and those tend to be clumped on a very few pages per file, such that
the potentially written pages might be measured in 100s of KB out of
the 3-5 MB (at that time) of XEmacs memory.
I'm not sure I believe (2), though.
Steve
next prev parent reply other threads:[~2013-01-04 10:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1TqZR5-0007qr-6Z@vcs.savannah.gnu.org>
2013-01-03 1:27 ` /srv/bzr/emacs/emacs-24 r111116: eval-after-load fix Dmitry Gutov
2013-01-03 1:38 ` Glenn Morris
2013-01-03 3:27 ` Stephen J. Turnbull
2013-01-04 5:34 ` Dmitry Gutov
2013-01-04 10:58 ` Stephen J. Turnbull [this message]
2013-01-04 18:10 ` Stefan Monnier
2013-01-04 22:32 ` Dmitry Gutov
2013-01-05 2:54 ` Stephen J. Turnbull
2013-01-04 5:32 ` Dmitry Gutov
2013-01-04 9:39 ` Andreas Schwab
2013-01-04 10:41 ` joakim
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87sj6hb4f0.fsf@uwakimon.sk.tsukuba.ac.jp \
--to=stephen@xemacs.org \
--cc=dgutov@yandex.ru \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.