gistfile1.rb

# ruby 1.9.3 was released today. One of the notes in the NEWS file says
#
# * yaml
#   * The default YAML engine is now Psych. You may downgrade to syck by setting
#     YAML::ENGINE.yamler = 'syck'.
#
# I assumed that psych would be faster than syck, so I ran a test. timeline.yml is
# 984K of twitter timeline json converted to yaml.

require 'yaml'
require "benchmark"

Benchmark.bm(10) do |x|
  x.report("Psych x1:") do
    YAML::ENGINE.yamler = 'psych'
    YAML.load_file('timeline.yml')
  end

  x.report("Syck x1:") do
    YAML::ENGINE.yamler = 'syck'
    YAML.load_file('timeline.yml')
  end

  x.report("Psych x10:") do
    YAML::ENGINE.yamler = 'psych'
    (1..10).each do
      YAML.load_file('timeline.yml')
    end
  end

  x.report("Syck x10:") do
    YAML::ENGINE.yamler = 'syck'
    (1..10).each do
      YAML.load_file('timeline.yml')
    end
  end
end

__END__
                 user     system      total        real
Psych x1:    0.760000   0.010000   0.770000 (  0.781250)
Syck x1:     0.260000   0.000000   0.260000 (  0.262390)
Psych x10:   8.100000   0.030000   8.130000 (  8.188998)
Syck x10:    2.820000   0.000000   2.820000 (  2.870540)