Json gem vs. Json pure

json_bench.rb

require 'rubygems'
require 'multi_json'
require 'benchmark'


n = 100000
json = "{\"ids_shop\":[],\"ids_collection\":[],\"ids_wish_list\":[]}"

Benchmark.bmbm do |x|
  # x.report("json") do 
  #   MultiJson.engine = :json_gem
  #   n.times { MultiJson.decode(json) }
  # end
  x.report("json pure") do 
    MultiJson.engine = :json_pure
    n.times { MultiJson.decode(json) }
  end
end

# Rehearsal ---------------------------------------------
# json pure   5.260000   0.010000   5.270000 (  5.267665)
# ------------------------------------ total: 5.270000sec
# 
#                 user     system      total        real
# json pure   5.300000   0.020000   5.320000 (  5.308652)

# Rehearsal ----------------------------------------
# json   0.760000   0.020000   0.780000 (  0.786621)
# ------------------------------- total: 0.780000sec
# 
#            user     system      total        real
# json   0.750000   0.030000   0.780000 (  0.770398)
# copy output