ruby 1.9 環境でPStoreとJsonファイルのI/O処理時間を比較してみた

gistfile1.rb

# encoding: utf-8
require "pstore"
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

Benchmark.bm(13) do |x|
 x.report("write: "){
   db = PStore.new("./backup")
   db.transaction do
     db["root"] = data
   end
 }
 x.report("read: "){
   db = PStore.new("./backup")
   db.transaction(true) do
     read_obj = db["root"]
   end
 }
end

p read_obj["1"][:test]
p read_obj["#{read_obj.size}"][:arr]

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

p read_obj["1"]["test"]
p read_obj["#{read_obj.size}"]["arr"]

計測結果の一例
PStore:
user system total real
write: 0.032000 0.000000 0.032000 ( 0.061003)
read: 0.046000 0.000000 0.046000 ( 0.054003)

JSONFile:
user system total real
write: 0.546000 0.031000 0.577000 ( 0.607035)
read: 0.812000 0.047000 0.859000 ( 0.849049)