Some interesting Ruby benchmarks

define_method_vs_class_eval.rb

require 'benchmark'

Benchmark.bm 20 do |x|
  x.report "define_method" do
    25_000.times do
      class MyClass
        define_method :foo do
          puts 'hi'
        end
      end
    end
  end

  x.report "class_eval" do
    25_000.times do
      class MyClass
        class_eval %{
          def foo
            puts 'hi'
          end
        }, __FILE__, __LINE__
      end
    end
  end
end

## Ruby Enterprise Edition 1.8.7
#                           user     system      total        real
# define_method         0.240000   0.010000   0.250000 (  0.251318)
# class_eval            0.320000   0.000000   0.320000 (  0.319751)

## Ruby 1.9.2rc2
#                           user     system      total        real
# define_method         0.120000   0.010000   0.130000 (  0.130996)
# class_eval            0.640000   0.000000   0.640000 (  0.637815)

## JRuby 1.5.1
#                           user     system      total        real
# define_method         0.756000   0.000000   0.756000 (  0.699000)
# class_eval            2.866000   0.000000   2.866000 (  2.866000)

for_vs_each.rb

require 'benchmark'

Benchmark.bm 20 do |x|
  x.report 'for' do
    25_000.times do
      for i in 1..5
        i += 1
      end
    end
  end

  x.report '#each' do
    25_000.times do
      (1..5).each do |i|
        i += 1
      end
    end
  end
end

## Ruby Enterprise Edition 1.8.7
#                           user     system      total        real
# for                   0.050000   0.000000   0.050000 (  0.053650)
# #each                 0.060000   0.000000   0.060000 (  0.058752)

## Ruby 1.9.2rc2
#                           user     system      total        real
# for                   0.020000   0.000000   0.020000 (  0.019428)
# #each                 0.020000   0.000000   0.020000 (  0.018324)

## JRuby 1.5.1
#                           user     system      total        real
# for                   0.376000   0.000000   0.376000 (  0.330000)
# #each                 0.093000   0.000000   0.093000 (  0.093000)

string_interpolation_vs_array_join.rb

require 'benchmark'

foo = 'foo'
bar = 'bar'

Benchmark.bm 20 do |x|
  x.report 'string interpolation' do
    100_000.times do
      "#{foo} #{bar}"
    end
  end

  x.report 'array join' do
    100_000.times do
      [foo, bar].join(' ')
    end
  end
end

## Ruby Enterprise Edition 1.8.7
#                           user     system      total        real
# string interpolation  0.080000   0.000000   0.080000 (  0.081084)
# array join            0.120000   0.000000   0.120000 (  0.121376)

## Ruby 1.9.2rc2
#                           user     system      total        real
# string interpolation  0.060000   0.000000   0.060000 (  0.060890)
# array join            0.110000   0.000000   0.110000 (  0.105644)

## JRuby 1.5.1
#                           user     system      total        real
# string interpolation  0.287000   0.000000   0.287000 (  0.240000)
# array join            0.140000   0.000000   0.140000 (  0.140000)

symbol_to_proc_vs_block.rb

require 'benchmark'

Benchmark.bm 20 do |x|
  x.report 'symbol#to_proc' do
    100_000.times do
      %w(1 2 3).map(&:to_i)
    end
  end

  x.report 'block' do
    100_000.times do
      %w(1 2 3).map {|i| i.to_i }
    end
  end
end

## Ruby Enterprise Edition 1.8.7
#                           user     system      total        real
# symbol#to_proc        0.670000   0.000000   0.670000 (  0.674756)
# block                 0.260000   0.000000   0.260000 (  0.256443)

## Ruby 1.9.2rc2
#                           user     system      total        real
# symbol#to_proc        0.140000   0.000000   0.140000 (  0.140275)
# block                 0.150000   0.000000   0.150000 (  0.154282)

## JRuby 1.5.1
#                           user     system      total        real
# symbol#to_proc        1.182000   0.000000   1.182000 (  1.136000)
# block                 0.188000   0.000000   0.188000 (  0.188000)

to_sym_vs_interpolation.rb

require 'benchmark'

name = 'foos'

Benchmark.bm 20 do |x|
  x.report 'interpolation' do
    100_000.times do
      :"@#{name}"
    end
  end

  x.report 'to_sym' do
    100_000.times do
      "@#{name}".to_sym
    end
  end
end

## Ruby Enterprise Edition 1.8.7
#                           user     system      total        real
# interpolation         0.070000   0.000000   0.070000 (  0.069094)
# #to_sym               0.080000   0.000000   0.080000 (  0.077872)

## Ruby 1.9.2rc2
#                           user     system      total        real
# interpolation         0.060000   0.000000   0.060000 (  0.057004)
# #to_sym               0.050000   0.000000   0.050000 (  0.056125)

## JRuby 1.5.1
#                           user     system      total        real
# interpolation         0.521000   0.000000   0.521000 (  0.468000)
# #to_sym               0.113000   0.000000   0.113000 (  0.113000)