gistfile1.rb

require 'rubygems'
require 'benchmark'
require 'rdiscount'

FILE = 'README.markdown'

Benchmark.bm do |b|

  b.report("File.read            ") do
    mdown = File.read(FILE)
    RDiscount.new(mdown).to_html
  end
  
  b.report("File.open.read       ") do
    mdown = File.open(FILE, 'r').read
    RDiscount.new(mdown).to_html
  end
  
  #SUCKS
  b.report("File.open 1nest +=   ") do
    mdown =  ''
    File.open(FILE, "r").each_line do |line|
      mdown += line
    end
    RDiscount.new(mdown).to_html
  end

  #SUCKS
  b.report("File.open 1nest <<   ") do
    mdown =  ''
    File.open(FILE, "r").each_line do |line|
      mdown << line
    end
    RDiscount.new(mdown).to_html
  end

  #SUCKS
  b.report("File.open 2nested += ") do
    mdown =  ''
    File.open(FILE, 'r') { |f|
      f.each_line do |line|
        mdown += line
      end
    }
    RDiscount.new(mdown).to_html
  end
  
  b.report("File.open 2nested << ") do
    mdown =  ''
    File.open(FILE, 'r') { |f|
      f.each_line do |line|
        mdown << line
      end
    }
    RDiscount.new(mdown).to_html
  end
  
end

#       user     system      total        real
# File.read              0.000000   0.000000   0.000000 (  0.001659)
# File.open.read         0.000000   0.000000   0.000000 (  0.001477)
# File.open 1nest +=     0.020000   0.010000   0.030000 (  0.024936)
# File.open 1nest <<     0.000000   0.000000   0.000000 (  0.002105)
# File.open 2nested +=   0.020000   0.000000   0.020000 (  0.021238)
# File.open 2nested <<   0.000000   0.000000   0.000000 (  0.002230)