# AR Object dup vs marshal benchmarks
#
# re: http://rails.lighthouseapp.com/projects/8994/tickets/785
#
#                        user       system     total       real
#  string saved in hash  0.050000   0.000000   0.050000 (  0.048411)
#    string marshalling  0.580000   0.020000   0.600000 (  0.659637)
# 
#  object saved in hash  0.040000   0.000000   0.040000 (  0.047936)
#    object marshalling  9.240000   0.170000   9.410000 (  9.932777)
# 
# string load from hash  0.040000   0.000000   0.040000 (  0.044545)
#   string marshal load  0.440000   0.010000   0.450000 (  0.478145)
# 
# object load from hash  0.040000   0.000000   0.040000 (  0.041927)
#   object marshal load  4.360000   0.090000   4.450000 (  4.689497)
#      object db reload 43.910000   3.520000  47.430000 ( 75.749377)

require 'benchmark'

namespace :bm do

  desc "Benchmark hash / marshalling"
  task :marshal => :environment do

    n = 100000
    s = "Hello, world!"
    o = Student.first
    h = Hash.new

    s_marshalled = Marshal.dump(s)
    o_marshalled = Marshal.dump(o)
    h_loaded = {:str => s, :obj => o}
    h_marshalled = {:str => s_marshalled, :obj => o_marshalled}

    Benchmark.bm do |x|
      x.report('string saved in hash'.rjust(24)) do
        n.times do
          h[:key] = s
        end
      end
      x.report('string marshalling'.rjust(24)) do
        n.times do
          h[:key] = Marshal.dump(s)
        end
      end
      puts
      x.report('object saved in hash'.rjust(24)) do
        n.times do
          h[:key] = o
        end
      end
      x.report('object marshalling'.rjust(24)) do
        n.times do
          h[:key] = Marshal.dump(o)
        end
      end
      puts
      x.report('string load from hash'.rjust(24)) do
        n.times do
          str = h_loaded[:str]
        end
      end
      x.report('string marshal load'.rjust(24)) do
        n.times do
          str = Marshal.load(h_marshalled[:str])
        end
      end
      puts
      x.report('object load from hash'.rjust(24)) do
        n.times do
          obj = h_loaded[:obj]
        end
      end
      x.report('object marshal load'.rjust(24)) do
        n.times do
          obj = Marshal.load(h_marshalled[:obj])
        end
      end
      x.report('object db reload'.rjust(24)) do
        n.times do
          obj = Student.find(o)
        end
      end
    end

  end
end