gist: 4688


  
    
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              # AR Object dup vs marshal benchmarks
#
# re: http://rails.lighthouseapp.com/projects/8994/tickets/785
#
#    user     system      total        real
#  string saved in hash  0.060000   0.000000   0.060000 (  0.051861)
#    string marshalling  0.630000   0.000000   0.630000 (  0.643304)
#
#  object saved in hash  0.060000   0.000000   0.060000 (  0.052789)
#    object marshalling  7.020000   0.030000   7.050000 (  7.073463)
#
# string load from hash  0.040000   0.000000   0.040000 (  0.047476)
#   string marshal load  0.450000   0.000000   0.450000 (  0.447863)
#
# object load from hash  0.040000   0.000000   0.040000 (  0.045871)
#   object marshal load  3.550000   0.010000   3.560000 (  3.575256)
#      object db reload 77.960000   3.300000  81.260000 ( 82.124798)
 
require 'benchmark'
 
namespace :bm do
 
  desc "Benchmark hash / marshalling"
  task :marshal => :environment do
 
    n = 100000
    s = "Hello, world!"
    o = Episode.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
      Episode.uncached do
        x.report('object db reload'.rjust(24)) do
          n.times do
            obj = Episode.find(o)
          end
        end
      end
    end
 
  end
end