marshal is faster and smaller than json

test_marshal_json.rb

require "json"
require "benchmark"

h = {}
1000.times{|i|h[i]=0}

print "marshaled size: "
marshaled = Marshal.dump(h)
puts marshaled.bytesize

print "jsoned size:    "
jsoned = h.to_json
puts jsoned.bytesize

puts 'marshal dump'
puts Benchmark.measure {
  1000.times{
    Marshal.dump h
  }
}
puts 'json dump'
puts Benchmark.measure {
  1000.times{
    h.to_json
  }
}
puts 'marshal load'
puts Benchmark.measure {
  1000.times{
    Marshal.load marshaled
  }
}
puts 'json load'
puts Benchmark.measure {
  1000.times{
    JSON.load jsoned
  }
}

__END__
marshaled size: 5627
jsoned size:    7891
marshal dump
  0.200000   0.000000   0.200000 (  0.200995)
json dump
  0.620000   0.000000   0.620000 (  0.612358)
marshal load
  0.300000   0.010000   0.310000 (  0.320537)
json load
  0.830000   0.000000   0.830000 (  0.827750)