Re: substring match like "strstr"

[Gerd Stolpmann <gerd@gerd-stolpmann.de>]

On Sun, 10 Dec 2000, eijiro_sumii@anet.ne.jp wrote:
>OK, I benchmarked the following 4 implementations for the purpose of
>comparison.
>
>  strstr
>    stub to call "strstr" in libc
>
>  regexp
>    combination of "Str.regexp_string" and "Str.search_forward"
>
>  OCamlA
>    the simple implementation in OCaml given in the previous message,
>    a little tuned for more efficiency
>
>  OCamlB
>    another straightforward implementation in OCaml, attached at the
>    end of this message
>
>The results (execution time in seconds) were as follows.
>
>  strstr   55.74
>  regexp  154.37
>  OCamlA  302.57
>  OCamlB  129.23

I did not expect that OCamlB performs so well; so I suggested OcamlA and
regexp (which are both fast for the bytecode interpreter, too). I think it
depends also on the problem size (especially on the length of the substring).

Gerd
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