Hi Yasu,
Indeed, String#[] will now perform slower on UTF8 non-ascii strings, because
computing the character index cannot be done in constant time anymore.
I don't believe this can be improved using the optimization we implemented for
#gsub and #scan. Maybe 1.9.2 has a better optimization, I will let Vincent
comment :)
Laurent
On Jan 16, 2011, at 8:26 AM, Yasu Imao wrote:
> Hi,
>
> I found another String performance issue, which is different from #1077. I
> used the same 8092 words English text in UTF-8 used in #1077.
>
> The latest nightly (2011/01/16) is about 6 times slower than MacRuby 0.8,
> which was as fast as 1.9.2.
>
> I'm just wondering if I should file this for 0.9 or for 'later'.
>
>
> text = File.read("test.txt")
> #text = File.read("test.txt").force_encoding("UTF-16BE")
> 1000.times do |i|
> a = text[i,i+30]
> end
>
>
> *Ruby 1.8.7 0.0019 0.0018 0.0017
> Ruby 1.9.2 0.029 0.030 0.029
> MacRuby 0.8 0.028 0.025 0.028
> MacRuby 0.9 2011/01/16 0.18 0.17 0.18
> MacRuby 0.9 2011/01/16 0.0023 0.0029 0.0021
> (force_encoding)
>
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