yaml_benchmark.rb

require 'rubygems'
require 'benchmark'
require 'yaml'
require 'zaml'
require 'json'

yaml_str = <<-eos
yaml goes here
eos

h = nil
GC.start
yaml_load_time = Benchmark::realtime {
1000.times { h = YAML.load(yaml_str) }
}

GC.start
to_yaml_time = Benchmark::realtime {
1000.times { h.to_yaml }
}

begin
  YAML::ENGINE.yamler = 'psych' if RUBY_VERSION == "1.9.2"
rescue
  puts "Cannot load Psych. Is libyaml installed? Install it and recompile Ruby."
  puts "On OS X with RVM, install it with MacPorts and run:"
  puts "rvm install ruby-1.9.2 -C --with-libyaml-dir=/opt/local"
  exit 1
end

GC.start
psych_load_time = Benchmark::realtime {
  1000.times { YAML.load(yaml_str) }
}

GC.start
to_yaml_psych_time  = Benchmark::realtime {
  1000.times { h.to_yaml }
}

GC.start
to_json_time = Benchmark::realtime {
1000.times { h.to_json }
}

GC.start
zaml_dump_time = Benchmark::realtime {
1000.times { ZAML.dump(h) }
}

marshaled = nil
GC.start
marshal_dump_time = Benchmark::realtime {
1000.times { marshaled = Marshal.dump(h) }
}

GC.start
marshall_load_time = Benchmark::realtime {
1000.times { h = Marshal.load(marshaled) }
}

puts `ruby -v`
puts "--------------------------------------------------------------------"
puts "YAML.load:\t\t#{'%.4f' % yaml_load_time}"
puts "YAML.load (Psych):\t#{'%.4f' % psych_load_time}" if RUBY_VERSION == "1.9.2"
puts "Marshal.load:\t\t#{'%.4f' % marshall_load_time}"
puts "to_yaml:\t\t#{'%.4f' % to_yaml_time}"
puts "to_load (Psych):\t#{'%.4f' % to_yaml_psych_time}" if RUBY_VERSION == "1.9.2"
puts "ZAML.dump:\t\t#{'%.4f' % zaml_dump_time}"
puts "to_json:\t\t#{'%.4f' % to_json_time}"
puts "Marshal.dump:\t\t#{'%.4f' % marshal_dump_time}"