From: Nala Ginrut <nalaginrut@gmail.com>
To: guile-devel@gnu.org
Subject: Extremly slow for format & string-join
Date: Mon, 01 Apr 2013 12:00:01 +0800 [thread overview]
Message-ID: <1364788801.4639.6.camel@Renee-desktop.suse> (raw)
I've tried to implement a function to mimic string multiply like Python:
"asdf" * 10
--------------code----------------
(define (str* str n)
(format #f "~{~a~}" (make-list n str)))
or
(define (str* str n)
(string-join (make-list n str) ""))
--------------end-----------------
Both are very slow when N is large (> 1000000).
For 'format':
================profile==============
time seconds seconds name
73.90 1089.05 1089.04 length
23.61 347.92 347.92 list-tail
0.78 1473.57 11.46 format:format-work
0.60 8.84 8.84 get-output-string
0.28 4.15 4.15 display
=================end=================
For 'string-join', is shows that the C implementation of string-join is
the bottleneck.
I have no time to dig into, just report it.
Regards.
next reply other threads:[~2013-04-01 4:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-01 4:00 Nala Ginrut [this message]
2013-04-01 4:39 ` Extremly slow for format & string-join Daniel Hartwig
2013-04-01 5:13 ` Nala Ginrut
2013-04-01 5:35 ` Daniel Hartwig
2013-04-01 6:58 ` Nala Ginrut
2013-04-01 7:02 ` Daniel Hartwig
2013-04-01 8:36 ` Mark H Weaver
2013-04-01 9:52 ` Nala Ginrut
2013-04-01 12:55 ` Ian Price
2013-04-02 15:56 ` Ludovic Courtès
2013-04-01 10:37 ` Thien-Thi Nguyen
[not found] <mailman.1257260.1364793213.854.guile-devel@gnu.org>
2013-04-01 6:59 ` Daniel Llorens
2013-04-01 7:40 ` Daniel Hartwig
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