granola-bench-encode.rb

require "benchmark/ips"
require "granola"

require "json"
require "oj"
require "yajl"

require "multi_json"
require "multi_json/adapters/json_gem"
require "multi_json/adapters/oj"
require "multi_json/adapters/yajl"

Oj.default_options = { mode: :compat }

User = Struct.new(:name, :age)

class UserSerializer < Granola::Serializer
  def data
    { "name" => object.name, "age" => object.age }
  end
end

SERIALIZER = UserSerializer.new(User.new("John Doe", 30))

JSON_METHOD  = JSON.method(:generate)
OJ_METHOD    = Oj.method(:dump)
YAJL_METHOD  = Yajl::Encoder.method(:encode)
MULTI_METHOD = MultiJson.method(:dump)

Benchmark.ips do |b|
  b.report("json") do
    Granola.json = JSON_METHOD
    SERIALIZER.to_json
  end

  b.report("oj") do
    Granola.json = OJ_METHOD
    SERIALIZER.to_json
  end

  b.report("yajl") do
    Granola.json = YAJL_METHOD
    SERIALIZER.to_json
  end

  b.report("multi_json/json") do
    MultiJson.engine = MultiJson::Adapters::JsonGem
    Granola.json = MULTI_METHOD
    SERIALIZER.to_json
  end

  b.report("multi_json/oj") do
    MultiJson.engine = MultiJson::Adapters::Oj
    Granola.json = MULTI_METHOD
    SERIALIZER.to_json
  end

  b.report("multi_json/yajl") do
    MultiJson.engine = MultiJson::Adapters::Yajl
    Granola.json = MULTI_METHOD
    SERIALIZER.to_json
  end

  b.compare!
end

granola-results.txt

Calculating -------------------------------------
                json     9.352k i/100ms
                  oj    21.870k i/100ms
                yajl     9.232k i/100ms
     multi_json/json     7.167k i/100ms
       multi_json/oj     9.979k i/100ms
     multi_json/yajl     6.656k i/100ms
-------------------------------------------------
                json    113.833k (± 8.2%) i/s -    570.472k
                  oj    348.320k (±23.5%) i/s -      1.662M
                yajl    117.316k (±24.3%) i/s -    563.152k
     multi_json/json     81.048k (± 9.9%) i/s -    408.519k
       multi_json/oj    124.795k (±11.2%) i/s -    618.698k
     multi_json/yajl     79.713k (±21.1%) i/s -    386.048k

Comparison:
                  oj:   348320.1 i/s
       multi_json/oj:   124794.7 i/s - 2.79x slower
                yajl:   117316.0 i/s - 2.97x slower
                json:   113833.2 i/s - 3.06x slower
     multi_json/json:    81047.7 i/s - 4.30x slower
     multi_json/yajl:    79713.5 i/s - 4.37x slower