From: Julian Assange <proff@iq.org>
To: eijiro_sumii@anet.ne.jp
Cc: caml-list@inria.fr, Jean-Christophe.Filliatre@lri.fr,
jmp@arsdigita.com, sumii@venus.is.s.u-tokyo.ac.jp
Cc: proff@iq.org
Subject: Re: substring match like "strstr"
Date: 13 Dec 2000 21:53:09 +1100 [thread overview]
Message-ID: <wxzoi0h9t6.fsf@suburbia.net> (raw)
In-Reply-To: eijiro_sumii@anet.ne.jp's message of "Wed, 13 Dec 2000 19:02:07 +0900"
eijiro_sumii@anet.ne.jp writes:
> Hi everyone,
>
> Thank you very much for a lot of kind advice!
>
> Jean-Christophe Filliatre <Jean-Christophe.Filliatre@lri.fr> wrote:
> > I missed the beginning of the discussion, but implementing
> > Knuth-Morris-Pratt is quite easy. The code is given below (26 lines),
>
> Actually, I found the (almost) same code on the web and tried it. The
> results (again, execution time in seconds) were:
>
> SPARC Pentium
> strstr 52.68 57.050
> kmp 111.52 143.490
All of these more sophisticated methods are only going to be a win
when you are searching for larger strings. strstr is brutally simple,
has little setup/cleanup time, and hence is hard to beat for short
strings. Additionally gcc, will replace various s* calls with in-line
assembly versions. I'm not sure if this includes strstr (it is a
little more complicated than most).
Cheers,
Julian.
next prev parent reply other threads:[~2000-12-14 18:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-08 6:04 eijiro_sumii
2000-12-08 12:57 ` Gerd Stolpmann
2000-12-10 13:16 ` eijiro_sumii
2000-12-10 15:39 ` Gerd Stolpmann
2000-12-11 3:57 ` eijiro_sumii
2000-12-12 13:58 ` Julian Assange
2000-12-11 21:07 ` Chris Hecker
2000-12-11 22:22 ` Gerd Stolpmann
2000-12-12 5:06 ` Chris Hecker
2000-12-12 12:28 ` Jean-Christophe Filliatre
2000-12-13 10:02 ` eijiro_sumii
2000-12-13 10:17 ` Eijiro Sumii
2000-12-13 10:53 ` Julian Assange [this message]
2000-12-13 13:28 ` Eijiro Sumii
2000-12-12 3:28 ` eijiro_sumii
2000-12-13 1:12 ` John Prevost
2000-12-13 2:35 ` Chris Hecker
2000-12-12 10:07 ` Sven LUTHER
2000-12-14 3:36 ` eijiro_sumii
2000-12-14 6:48 ` Chris Hecker
2000-12-14 8:02 ` eijiro_sumii
2000-12-14 21:53 ` Stephan Tolksdorf
2000-12-14 21:12 Ruchira Datta
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