From: "Peter S. Christopher" <peterc@midway.uchicago.edu>
Subject: Re: Floating Point?
Date: Tue, 9 Sep 2003 09:34:58 -0500 (CDT) [thread overview]
Message-ID: <Pine.GSO.4.21.0309090924260.12910-100000@harper.uchicago.edu> (raw)
In-Reply-To: <20030909092613.GE29118@ws24047.math.univ-rennes1.fr>
As I mentioned in my last e-mail, I tried the python-approach and it does
give some nice performance enhancements. My problem with it is that it's
fairly awkward even for some relatively easy algorithms. I think (unless
anyone has any ideas;-}) it is as good as we'll get unless/until GUILE
becomes a compiled language. (In this later case, one could imagine
embedding special forms that allow fast array loops and other fancy
enhancments).
Pete
On Tue, 9 Sep 2003, David Allouche wrote:
> On Tue, Sep 09, 2003 at 09:52:26AM +0200, tomas@fabula.de wrote:
> > No. Arbitrary precision is for integers (it's impossible to do general
> > arbitrary precision for reals). Floats in Guile are just machine floats
> > (properly wrapped as SCMs, which might make them a tad `slower', though).
> >
> > If I see right, they are just machine doubles, referenced indirectly
> > through the SCM object (thus the unwrapping costs you a dereference).
>
> Just an idea...
>
> Python had a similar problem: the language overhead dominated
> computing time in number crunching applications. This problem was
> solved by the implementation of a fast (written in C) matrix crunching
> library. The basic idea is "to add 1000 FP numbers, add two matrices
> and let the looping be done in C instead of in Scheme". Of course, the
> usual collection of algebra is also a nice bonus.
>
> Now, Python, though well known as a generally slow language is
> successfully used in many demanding number-crunching applications.
>
> --
> David Allouche | GNU TeXmacs -- Writing is a pleasure
> Free software engineer | http://www.texmacs.org
> http://ddaa.net | http://savannah.gnu.org/projects/texmacs
> david@allouche.net | allouche@texmacs.org
> TeXmacs is NOT a LaTeX front-end and is unrelated to emacs.
>
>
> _______________________________________________
> Guile-user mailing list
> Guile-user@gnu.org
> http://mail.gnu.org/mailman/listinfo/guile-user
>
_______________________________________________
Guile-user mailing list
Guile-user@gnu.org
http://mail.gnu.org/mailman/listinfo/guile-user
next prev parent reply other threads:[~2003-09-09 14:34 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-06 18:10 Floating Point? Peter S. Christopher
2003-09-08 14:43 ` Betoes
2003-09-09 7:52 ` tomas
2003-09-09 9:26 ` David Allouche
2003-09-09 14:34 ` Peter S. Christopher [this message]
2003-09-09 21:15 ` Robert Uhl
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
List information: https://www.gnu.org/software/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Pine.GSO.4.21.0309090924260.12910-100000@harper.uchicago.edu \
--to=peterc@midway.uchicago.edu \
/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.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).