hash like comparison benchmark

hashlike_bench.rb

#!/usr/bin/env ruby

require 'rubygems'
require "benchmark"
require 'map'
require 'digest/md5'
require 'hashr'
require 'hashie'

def keys( count, start = 'aaaaaa' )
  k = []
  count.times { k << start.succ! }
  return k
end

def values_from( keys1, keys2 )
  values = []
  keys1.each do |k1|
    keys2.each do |k2|
      values << Digest::MD5.hexdigest( "#{k1}/#{k2}" )
    end
  end
  return values
end

def nested_yield( keys1, keys2 )
  keys1.each do |k1|
    keys2.each do |k2|
      yield k1, k2
    end
  end
end


puts "Testing 2 level hashes between Hash and Map"
keys1 = keys( 100, 'aaaaaa' )
keys2 = keys( 100, 'bbbbbb' )

puts "Starting benchmark"
Benchmark.bm(42) do |bm|
  bm.report("values gen") do
    values = values_from( keys1, keys2 )
  end

  bm.report("Hash") do 
    h = Hash.new{ |h,k| h[k] = Hash.new }
    values = values_from( keys1, keys2 )
    nested_yield( keys1, keys2) do |k1, k2|
      h[k1][k2] = values.shift
    end
  end

  bm.report("Map.set") do
    m = Map.new
    values = values_from( keys1, keys2 )
    nested_yield( keys1, keys2 ) do |k1, k2|
      m.set( k1, k2, values.shift )
    end
  end

  bm.report( "Hashr" ) do
    h = Hashr.new
    values = values_from( keys1, keys2 )
    nested_yield( keys1, keys2 ) do |k1, k2|
      h.set("#{k1}.#{k2}", values.shift )
    end
  end

  bm.report( "Mash" ) do
    m = Hashie::Mash.new
    values = values_from( keys1, keys2 )
    nested_yield( keys1, keys2 ) do |k1, k2|
      m.send( "#{k1}!" ).send( "#{k2}=", values.shift )
    end
  end
end

__END__
% ruby hashlike_bench.rb
Testing 2 level hashes between Hash and Map
Starting benchmark
                                                user     system      total        real
values gen                                  0.030000   0.000000   0.030000 (  0.028457)
Hash                                        0.040000   0.000000   0.040000 (  0.040128)
Map.set                                     0.260000   0.010000   0.270000 (  0.258244)
Hashr                                       0.450000   0.010000   0.460000 (  0.473694)
Mash                                        0.180000   0.010000   0.190000 (  0.178579)