gistfile1.rb

# MongoDB Java driver vs Ruby Driver with JRuby 1.3.1
#
#       user     system      total        real
# java driver (find)  2.266000   0.000000   2.266000 (  2.266000)
# ruby driver (find)  6.790000   0.000000   6.790000 (  6.790000)
# java driver (create)  0.602000   0.000000   0.602000 (  0.602000)
# ruby driver (create)  3.963000   0.000000   3.963000 (  3.963000)

require "java"
require "benchmark"
require "rubygems"
require "mongo"
require "mongo.jar"

class MongoJava
  import "com.mongodb.Mongo"
  import "com.mongodb.DBCollection"
  import "com.mongodb.BasicDBObject"
  import "com.mongodb.DBObject"
  
  def initialize
    @db = Mongo.new("mongojavatest")
    @coll = @db.get_collection("testCollection")
    @coll.drop

    doc = BasicDBObject.new
    doc.put "name", "MongoDB"
    @coll.insert(doc)
  end
  
  def create
    doc = BasicDBObject.new
    doc.put "name", "MongoDB"
    @coll.insert(doc)
  end
  
  def find
    @coll.find_one
  end
end

class MongoRuby
  def initialize
    @db = Mongo::Connection.new.db("mongorubytest")
    @coll = @db.collection("testCollection")
    @coll.insert({ "name" => "MongoDB" })
  end
  
  def create
    @coll.insert({ "name" => "MongoDB" })
  end
  
  def find
    @coll.find_one
  end
end

jdriver = MongoJava.new
rdriver = MongoRuby.new

TIMES = 10_000

Benchmark.bm do |x|
  x.report("java driver (find)") { TIMES.times { |n| jdriver.find } }
  x.report("ruby driver (find)") { TIMES.times { |n| rdriver.find } }
  x.report("java driver (create)") { TIMES.times { |n| jdriver.create } }
  x.report("ruby driver (create)") { TIMES.times { |n| rdriver.create } }
end

gistfile2.rb

#       user     system      total        real
# ruby 1.8.6  4.570000   0.400000   4.970000 (  6.119891)
#
#       user     system      total        real
# ruby 1.9.1  2.740000   0.460000   3.200000 (  4.251336)

require "benchmark"
require "rubygems"
require "mongo"

class MongoRuby
  def initialize
    @db = Mongo::Connection.new.db("mongorubytest")
    @coll = @db.collection("testCollection")
    @coll.insert({ "name" => "MongoDB" })
  end
  
  def find
    @coll.find_one
  end
end

rdriver = MongoRuby.new

TIMES = 10_000

Benchmark.bm do |x|
  x.report("ruby driver") { TIMES.times { |n| rdriver.find } }
end