msgpack<->pstore でベンチしてみたらJSONよりも遅いという結果に

benchmark_2.rb

# encoding: utf-8

require "pstore"
require "msgpack"
require "json"
require "benchmark"

_data = {test: "testdatatestdatatestdata",
         data: 18358374659302536,
         _float: 0.1332542572647585,
         arr: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,],
         nested: {key: "key", arr: [1, 1, 1, 000, 32435, true, false]},
         bool: true
}

data = {}
read_obj = nil

(1..30000).each do |cycle|
  data["#{cycle}"] = _data
end

p "msgpack+pstore"
Benchmark.bm(13) do |x|
  packed = MessagePack.pack(data)
  x.report("write: ") {
    db = PStore.new("./backup")
    db.transaction do
      db["root"] = MessagePack.unpack(packed)
    end
  }
  x.report("read: ") {
    db = PStore.new("./backup")
    db.transaction(true) do
      read_obj = db["root"]
      MessagePack.pack(read_obj)
    end
  }
end

p "json"
Benchmark.bm(13) do |x|
  x.report("write: ") {
    File.open('json', 'w') do |f|
      f.flock(File::LOCK_EX)

      f.write JSON.generate(data)

      f.flock(File::LOCK_UN)
    end
  }
  x.report("read: ") {
    File.open('json', 'r') do |f|
      f.flock(File::LOCK_EX)

      read_obj = JSON.load(f)

      f.flock(File::LOCK_UN)
    end
  }
end

計測結果

msgpack+pstore
user system total real
write: 0.827000 0.000000 0.827000 ( 0.836048)
read: 0.936000 0.015000 0.951000 ( 0.943054)

json
user system total real
write: 0.609000 0.016000 0.625000 ( 0.668038)
read: 0.873000 0.000000 0.873000 ( 0.878050)

Process finished with exit code 0

多分、msgpackを通すとHash-key値のSymbolがStringになってしまうのが負荷要因と推測する