From: Xah Lee <xahlee@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: is there a emacs lisp timing command?
Date: Mon, 23 Mar 2009 18:57:44 -0700 (PDT) [thread overview]
Message-ID: <3a58c551-a1da-4794-8eb3-7de3c504c556@n7g2000prc.googlegroups.com> (raw)
is there a elisp command like timing, that returns the time a function
took?
while testing some performance issues, i tried to write one.
(defun xx-timing ()
"returns the timing."
(interactive)
(let (starttime endtime)
(setq starttime (current-time))
;; some function here
(sleep-for 0 5)
(setq endtime (current-time))
(message "%f" (+ (* (- (elt endtime 0)
(elt starttime 0)) 65536)
(- (elt endtime 1)
(elt starttime 1))
(* (- (elt endtime 2)
(elt starttime 2)) 0.001)))
))
but after about 20 minutes on this, i gave up. It seems to me, when
microseconds is involved (returned by current-time), the result is
weired. I don't see any logical problem in my code, but the above code
is obvious wrong, often returning results some 70 seconds extra
whenever microseconds is involved.
anyone has written a timing command somewhere?
This is on:
GNU Emacs 22.2.1 (powerpc-apple-darwin8.11.0, Carbon Version 1.6.0) of
2008-04-05 on g5.tokyo.stp.isas.jaxa.jp
PowerPC G5, osx 10.4.11.
Xah
∑ http://xahlee.org/
☄
next reply other threads:[~2009-03-24 1:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-24 1:57 Xah Lee [this message]
2009-03-24 6:12 ` is there a emacs lisp timing command? thierry.volpiatto
2009-03-24 6:35 ` thierry.volpiatto
2009-03-24 6:46 ` thierry.volpiatto
2009-03-24 7:30 ` Helmut Eller
2009-03-24 8:11 ` thierry.volpiatto
2009-03-24 10:05 ` David Kastrup
2009-03-24 20:25 ` Nikolaj Schumacher
[not found] ` <mailman.3921.1237926315.31690.help-gnu-emacs@gnu.org>
2009-03-24 22:07 ` Xah Lee
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