json_benchmark.rb

require 'rubygems'
require 'json'
require 'benchmark'

# all_dbs.js > Output from CouchDBs http://127.0.0.1:5984/_all_dbs
# Simple array of strings
js = File.read('all_dbs.js')
# sg.js > Internal API for hotels in a city (Singapore)
# Slightly more complicated nested data structures including strings and numbers and arrays and hashes
sg = File.read('sg.js')

Benchmark.bm do |x|
  x.report("simple json:") { JSON.parse(js) }
  x.report("slightly complicated json:") { JSON.parse(sg) }
end


Results:

* 1.9.1-p0
arun:~/ruby/json_benchmark$ ~/.multiruby/install/1.9.1-p0/bin/ruby json_parser.rb 
      user     system      total        real
simple json: 13.060000   0.310000  13.370000 ( 13.384820)
slightly complicated json: 18.420000   0.110000  18.530000 ( 18.556238)

* 1.8.7
arun:~/ruby/json_benchmark$ ruby json_parser.rb 
      user     system      total        real
simple json: 13.290000   0.330000  13.620000 ( 13.759942)
slightly complicated json: 16.170000   0.080000  16.250000 ( 16.356992)