benchmark.rb

require 'rubygems'
require "./nolate"
require "erb"
require "bench"

module FastERB
  def self.new(*args)
    o = Object.new
    erb = ERB.new(*args)
    o.extend erb.def_module("render(myfield)")
  end
end

myfield = 10
slow_erb = ERB.new("The sum is <%=2+2%> Also substitute <%=myfield%> ok")
slow_erb100 = ERB.new("The sum is <%=2+2%> Also substitute <%=myfield%> ok" * 100)
fast_erb = FastERB.new("The sum is <%=2+2%> Also substitute <%=myfield%> ok")
fast_erb100 = FastERB.new("The sum is <%=2+2%> Also substitute <%=myfield%> ok" * 100)

benchmark "nolate" do
  nolate("The sum is <%=2+2%> Also substitute <%#myfield%> ok", {:myfield => 10})
end

benchmark "slow_erb" do
  slow_erb.result
end

benchmark "fast_erb" do
  fast_erb.render(10)
end

benchmark "nolate * 100" do
  nolate("The sum is <%=2+2%> Also substitute <%#myfield%> ok" * 100, {:myfield => 10})
end

benchmark "slow_erb * 100" do
  slow_erb100.result
end

benchmark "fast_erb * 100" do
  fast_erb100.render(10)
end

run 10000

# Ruby 1.8.7
#                     user     system      total        real
# nolate          0.340000   0.020000   0.360000 (  0.349417)
# slow_erb        0.410000   0.000000   0.410000 (  0.414083)
# fast_erb        0.070000   0.000000   0.070000 (  0.077964)
# nolate * 100   25.520000   0.760000  26.280000 ( 26.967786)
# slow_erb * 100 22.780000   0.080000  22.860000 ( 23.389305)
# fast_erb * 100  3.360000   0.010000   3.370000 (  3.402738)

# Ruby 1.9.2
#                     user     system      total        real
# nolate          0.320000   0.010000   0.330000 (  0.333347)
# slow_erb        0.510000   0.010000   0.520000 (  0.515306)
# fast_erb        0.030000   0.000000   0.030000 (  0.037021)
# nolate * 100   22.060000   0.080000  22.140000 ( 22.420401)
# slow_erb * 100 19.320000   0.080000  19.400000 ( 19.461102)
# fast_erb * 100  1.580000   0.010000   1.590000 (  1.618233)