gistfile1.rb

require 'benchmark'

N      =  1000000
fixnum =  1234567
float  =  1.23456
string = 'abcdefg'
symbol = :symbol!

Benchmark.bm(11) do |x|
  x.report 'Fixnum#to_s' do
  (1..N).each { fixnum.to_s }
end

x.report '"#{Fixnum}"' do
(1..N).each { "#{fixnum}" }
  end
  x.report 'Float#to_s' do
  (1..N).each { float.to_s }
  end

  x.report '"#{Float}"' do
  (1..N).each { "#{float}" }
  end

  x.report 'Symbol#to_s' do
  (1..N).each { symbol.to_s }
  end

  x.report '"#{Symbol}"' do
  (1..N).each { "#{symbol}" }
  end

  x.report 'String#to_s' do
  (1..N).each { string.to_s }
  end

  x.report '"#{String}"' do
  (1..N).each { "#{string}" }
  end
end

=begin
                  user     system      total        real
Fixnum#to_s   0.220000   0.000000   0.220000 (  0.228480)
"#{Fixnum}"   0.320000   0.000000   0.320000 (  0.322111)
Float#to_s    0.590000   0.000000   0.590000 (  0.585839)
"#{Float}"    0.730000   0.000000   0.730000 (  0.724339)
Symbol#to_s   0.140000   0.000000   0.140000 (  0.141902)
"#{Symbol}"   0.250000   0.000000   0.250000 (  0.250409)
String#to_s   0.070000   0.000000   0.070000 (  0.068322)
"#{String}"   0.130000   0.000000   0.130000 (  0.136455)
=end