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Bug #8129

Updated by nobu (Nobuyoshi Nakada) over 6 years ago

=begin
I created a simple ruby script:



```
#! /usr/bin/env ruby



raise "need a file name" unless ARGV[0]

contents = File.read(ARGV[0])



326_000.times do |i|

contents[(i + 23) % contents.size]

end
```


And I uploaded two files below. One is all ASCII characters and the other has a single Unicode character in the first line (an "em dash").

String#index has dramatically different performance for the two strings. Locally, I'm seeing ~1.5 seconds with all_ascii.css and ~30 seconds with one_unicode.css on 1.9.3-p385. It gets worse with ruby 2.0, all_ascii.css still takes ~1 sec, but one_unicode.css takes ~2.5 minutes!

Any idea why the performance is so dramatically different between the two?
=end

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