Ruby 1.9.3 prev1 で Array#[]=( Array.new ) が1.9.2より2倍遅い

Ruby Development
1

Array$B%*%V%8%’%/%H$r(B Array#[]= $B$G@_Dj$9$k>l9g$K!"(B
ruby 1.9.3 prev1 $B$,(B 1.9.2 p290
$B$HHf3S$7$F(B2$BG$[$ICY$/$J$C$F$$$k$h$&$J$N$G(B
$B$4Js9p$$$?$7$^$9!#(B

($B4{CN$N8=>]$G$"$l$P!"?=$7Lu$"$j$^$;$s$,%9%k!<$7$F$/$@$5$$(B)

require ‘benchmark’

Benchmark.bm(22) do |x|
x.report “Array.new” do
1_000_000.times do
Array.new(100)
end
end

x.report “Array#[]= with Array” do
a = Array.new(1_000_000)
1_000_000.times do |i|
a[i] = Array.new(100)
end
end
end

$B>e5-$N%3!<%I$r<B9T$7$?>l9g$K!";d$N4D6-$G$O0J2<$N$h$&$J7k2L$H$J$j$^$9!#(B
$ ruby19 -v bm_array.rb
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.0.0]
user system total real
Array.new 0.600000 0.140000 0.740000 ( 0.740639)
Array#[]= with Array 8.590000 0.300000 8.890000 ( 8.874507)

$ ruby -v bm_array.rb
ruby 1.9.3dev (2011-07-31 revision 32789) [x86_64-darwin11.0.0]
user system total real
Array.new 0.670000 0.160000 0.830000 ( 0.826589)
Array#[]= with Array 16.160000 0.280000 16.440000 ( 16.597618)

$B;HMQ$7$F$$$k4D6-$O(B

  • OS : Mac OS X 10.7
  • CPU : Intel Core i5
  • Memory : 4GB
  • compiler: gcc 4.2.1
    $B$G$9!#(B

$B0J>e!"$h$m$7$/$*4j$$$$$?$7$^$9!#(B