From: ludo@gnu.org (Ludovic Courtès)
To: guile-devel@gnu.org
Subject: Re: Extremly slow for format & string-join
Date: Tue, 02 Apr 2013 17:56:16 +0200 [thread overview]
Message-ID: <87d2udx6xr.fsf@gnu.org> (raw)
In-Reply-To: 87obdy3aw9.fsf@tines.lan
Mark H Weaver <mhw@netris.org> skribis:
> Indeed, the implementation of 'string-join' was very bad: about O(n^2)
[...]
> Before:
>
> scheme@(guile-user)> ,time (define s (string-join (make-list 10000 "test") "-"))
> ;; 0.998800s real time, 0.996677s run time. 0.984885s spent in GC.
> scheme@(guile-user)> ,time (define s (string-join (make-list 100000 "test") "-"))
> ;; 98.006569s real time, 97.817077s run time. 97.795970s spent in GC.
>
> After:
>
> scheme@(guile-user)> ,time (define s (string-join (make-list 10000 "test") "-"))
> ;; 0.006362s real time, 0.006351s run time. 0.000000s spent in GC.
> scheme@(guile-user)> ,time (define s (string-join (make-list 100000 "test") "-"))
> ;; 0.028513s real time, 0.028457s run time. 0.022235s spent in GC.
> scheme@(guile-user)> ,time (define s (string-join (make-list 1000000 "test") "-"))
> ;; 0.303098s real time, 0.302543s run time. 0.289639s spent in GC.
> scheme@(guile-user)> ,time (define s (string-join (make-list 10000000 "test") "-"))
> ;; 3.288105s real time, 3.281922s run time. 3.174460s spent in GC.
Nice!
Ludo’.
next prev parent reply other threads:[~2013-04-02 15:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-01 4:00 Extremly slow for format & string-join Nala Ginrut
2013-04-01 4:39 ` 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 [this message]
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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