From: Katsumi Yamaoka <yamaoka@jpl.org>
Subject: Re: Using CL in Gnus
Date: Tue, 02 Dec 2003 07:54:54 +0900 [thread overview]
Message-ID: <b9ysmk4ywqp.fsf@jpl.org> (raw)
In-Reply-To: <4n8ylwfd1n.fsf@lockgroove.bwh.harvard.edu>
mapc is faster than mapcar, but dolist is a bit faster than mapc,
though they may change with cases. What should be mentioned
especially is that dolist can be used without a problem also in
Emacs 20. :)
(defvar numbers-list (let ((n 0) rest)
(while (< n 65536)
(setq rest (cons n rest)
n (1+ n)))
(nreverse rest)))
(defvar numbers-sum 0)
(progn
(setq numbers-sum 0)
(benchmark 10
(dolist (n numbers-list numbers-sum)
(setq numbers-sum (+ numbers-sum n)))))
=> 0.1352449655532837
(progn
(setq numbers-sum 0)
(benchmark 10
(mapc (lambda (n)
(setq numbers-sum (+ numbers-sum n)))
numbers-list)))
=> 0.1569150686264038
(progn
(setq numbers-sum 0)
(benchmark 10
(mapcar (lambda (n)
(setq numbers-sum (+ numbers-sum n)))
numbers-list)))
=> 0.678508996963501
;; http://quimby.gnus.org/elisp/benchmark.el
--
Katsumi Yamaoka <yamaoka@jpl.org>
next prev parent reply other threads:[~2003-12-01 22:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-24 23:29 gnus-agentize versus emacs 20 mapc Kevin Ryde
2003-11-24 23:57 ` Katsumi Yamaoka
2003-11-25 3:45 ` Kevin Greiner
2003-11-25 4:18 ` Katsumi Yamaoka
2003-11-25 21:47 ` Kevin Ryde
2003-11-26 2:13 ` Katsumi Yamaoka
2003-11-26 11:34 ` Using CL in Gnus (was: gnus-agentize versus emacs 20 mapc) Reiner Steib
2003-11-26 12:23 ` Using CL in Gnus Katsumi Yamaoka
2003-11-26 17:38 ` Reiner Steib
2003-11-26 19:46 ` Karl Pflästerer
2003-11-27 22:41 ` Reiner Steib
2003-11-28 16:30 ` Karl Pflästerer
2003-11-28 17:08 ` Jesper Harder
2003-11-29 8:04 ` Miles Bader
2003-11-29 9:10 ` Jesper Harder
2003-11-29 12:37 ` Miles Bader
2003-12-01 21:23 ` Ted Zlatanov
2003-12-01 22:54 ` Katsumi Yamaoka [this message]
2003-11-30 13:22 ` Using CL in Gnus (was: gnus-agentize versus emacs 20 mapc) Per Abrahamsen
2003-11-28 21:31 ` gnus-agentize versus emacs 20 mapc Kevin Ryde
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