benchmark json generation and parsing in rails/ruby

json_generation.rb

#!/usr/bin/env ruby

require 'benchmark'
require 'rubygems'
require 'nokogiri'
require 'yajl'

require 'active_support'
ActiveSupport::XmlMini.backend='Nokogiri'
require 'active_resource'

TIMES = 1000

data_hash = ('a'..'zz').inject([]) {|acc, x| acc << {x => x.to_s } }
json_str = File.read('json_gen_file.json')
xml_str = File.read('json_gen_file.xml')

Benchmark.bmbm do |x|
  x.report('nokogiri-generate') do
    TIMES.times do
      builder = Nokogiri::XML::Builder.new do |xml|
        xml.test do
          data_hash.each { |k,v| xml.tag!(k, v) }
        end
      end
      builder.to_xml
    end
  end
  x.report('yajl-generate') do
    TIMES.times { Yajl::Encoder.encode(data_hash) }
  end
  x.report('activeresource-generate-xml') do
    TIMES.times { ActiveResource::Formats::XmlFormat.encode(data_hash) }
  end
  x.report('activeresource-generate-json') do
    TIMES.times { ActiveResource::Formats::JsonFormat.encode(data_hash) }
  end
  x.report('nokogiri-read') do
    TIMES.times do
      doc = Nokogiri::XML(xml_str) { |cfg| cfg.noblanks }
      raise doc.errors.first if doc.errors.length > 0
    end
  end
  x.report('yajl-read') do
    TIMES.times { Yajl::Parser.parse(json_str) }
  end
  x.report('activeresource-read-xml') do
    TIMES.times { ActiveResource::Formats::XmlFormat.decode(xml_str) }
  end
  x.report('activeresource-read-json') do
    TIMES.times { ActiveResource::Formats::JsonFormat.decode(json_str) }
  end  
end

__END__

# ree 2010.01 with rails2.3.5
user     system      total        real
nokogiri-generate             21.810000   0.010000  21.820000 ( 21.811517)
yajl-generate                  0.780000   0.000000   0.780000 (  0.795478)
activeresource-generate-xml   66.590000   0.010000  66.600000 ( 66.590918)
activeresource-generate-json  25.300000   0.020000  25.320000 ( 25.311039)
nokogiri-read                  1.500000   0.000000   1.500000 (  1.491643)
yajl-read                      1.270000   0.000000   1.270000 (  1.276286)
activeresource-read-xml      184.660000   0.070000 184.730000 (184.748111)
activeresource-read-json      21.530000   0.000000  21.530000 ( 21.527788)

# ree 2010.01 with rails3-rc
nokogiri-generate             21.680000   0.040000  21.720000 ( 21.723874)
yajl-generate                  0.780000   0.000000   0.780000 (  0.780465)
activeresource-generate-xml   82.330000   0.100000  82.430000 ( 82.544486)
activeresource-generate-json  16.300000   0.000000  16.300000 ( 16.307495)
nokogiri-read                  1.340000   0.000000   1.340000 (  1.336867)
yajl-read                      1.210000   0.010000   1.220000 (  1.215114)
activeresource-read-xml       56.410000   0.040000  56.450000 ( 56.608312)
activeresource-read-json       1.240000   0.000000   1.240000 (  1.261060)

# memory benchmark
# ree 2010.01 with rails2.3.5 
# with the default values for GC tuning
# RUBY_HEAP_MIN_SLOTS,RUBY_HEAP_SLOTS_INCREMENT,
# RUBY_HEAP_SLOTS_GROWTH_FACTOR, RUBY_GC_MALLOC_LIMIT
# have added, using http://github.com/brianmario/yajl-rails on rails 2.3.5 
# getting the stats by:
# GC.enable_stats
# #<code>
# GC.disable_stats
# puts GC.collections                                                                              
# puts ObjectSpace.live_objects

user                                       live_objects gc_cycles
nokogiri-generate                          152166       5  
yajl-generate                              156617       0 
activeresource-generate-xml                326285       5                    
activeresource-generate-json-normal        197040       2  
activeresource-generate-json-yajl-rails    206439       2             
nokogiri-read                              121409       0 
yajl-read                                  96135        1 
activeresource-read-xml                    185695       8             
activeresource-read-json-normal            197820       3             
activeresource-read-json-yajl-rails        358533       0

wanted to use memprof but was not working on the server, gives a segmentation fault:
http://github.com/ice799/memprof/issues/7

Could you post the json/xml files used as well?

@thatdutchguy the json files must be in my old laptop, i will try to find them but cannot promise