shit.rb

#!/usr/bin/env ruby

require "benchmark"

def speak_with_block(&block)
  block.call
end

def speak_with_yield
  yield
end

n = 1_000_000
Benchmark.bmbm do |x|
  x.report("&block") do
    n.times { speak_with_block { "ook" } }
  end
  x.report("yield") do
    n.times { speak_with_yield { "ook" } }
  end
end

# 1.9.2 ~/Desktop $ ./shit.rb 
# Rehearsal ------------------------------------------
# &block   2.260000   0.020000   2.280000 (  2.761372)
# yield    0.570000   0.000000   0.570000 (  0.674249)
# --------------------------------- total: 2.850000sec
# 
#              user     system      total        real
# &block   2.300000   0.020000   2.320000 (  2.492953)
# yield    0.590000   0.000000   0.590000 (  0.659533)

# 1.9.3 ~/Desktop $ ./shit.rb 
# Rehearsal ------------------------------------------
# &block   2.450000   0.170000   2.620000 (  2.648374)
# yield    0.420000   0.000000   0.420000 (  0.435521)
# --------------------------------- total: 3.040000sec
# 
#              user     system      total        real
# &block   2.290000   0.140000   2.430000 (  3.283690)
# yield    0.400000   0.000000   0.400000 (  0.414590)