From: Ted Zlatanov <tzz@lifelogs.com>
To: emacs-devel@gnu.org
Subject: Re: remove-duplicates performances
Date: Fri, 20 May 2011 12:57:58 -0500 [thread overview]
Message-ID: <87k4dlp849.fsf@lifelogs.com> (raw)
In-Reply-To: 871uztqpb7.fsf@fencepost.gnu.org
On Fri, 20 May 2011 19:01:16 +0200 David Kastrup <dak@gnu.org> wrote:
DK> Well, the sorting function is a mess due to not being compiled and
DK> fearing dynamic binding. If you byte-compile something like
...
DK> the behavior is likely better.
Incidentally, Doug Hoyte claims in "Let Over Lambda" that sorting
networks have better performance than other sorting algorithms for small
lists (25 elements was the biggest optimization example he gave). This
seemed very reasonable to me because of their low memory and startup
costs, though I don't know enough about the topic to recommend sorting
networks in Emacs Lisp specifically.
It may be worthwhile to generate optimized sorting networks for such
small lists and to use them for sorting and (with modifications) for
`remove-duplicates' and frequency counting. Is anyone interested?
Ted
prev parent reply other threads:[~2011-05-20 17:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 13:51 remove-duplicates performances Thierry Volpiatto
2011-05-20 14:09 ` Stefan Monnier
2011-05-20 14:39 ` Thierry Volpiatto
2011-05-20 16:14 ` Stefan Monnier
2011-05-20 17:46 ` Thierry Volpiatto
2011-05-20 15:16 ` Ted Zlatanov
2011-05-20 14:28 ` David Kastrup
2011-05-20 16:00 ` Thierry Volpiatto
2011-05-20 17:01 ` David Kastrup
2011-05-20 17:31 ` Thierry Volpiatto
2011-05-20 17:46 ` David Kastrup
2011-05-20 18:01 ` Stefan Monnier
2011-05-20 21:57 ` Pascal J. Bourguignon
2011-05-20 17:57 ` Ted Zlatanov [this message]
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