From: Tanaka Akira <akr@...>
Date: 2008-01-20T01:07:05+09:00
Subject: [ruby-dev:33189] nonlinear performance of each_char

String#each_char の処理時間が文字列長に比例しない感じです。

% ./ruby -v -e '
c = "\xa1\xa1".force_encoding("euc-jp");
1000.step(20000, 1000) {|n|
  s = c * n
  t1 = Process.times.utime
  s.each_char {|x| }
  t2 = Process.times.utime
  p t2 - t1
}
'
ruby 1.9.0 (2008-01-19 revision 0) [i686-linux]
0.09
0.35
0.8
1.41
2.22
3.21
4.34
5.68
7.14
8.85
10.62
12.63
14.8
17.15
19.7
22.38
25.25
28.25
31.47
34.9
-- 
[田中 哲][たなか あきら][Tanaka Akira]