new benchmark common to all drivers

bin/standard_benchmark

@@ -0,0 +1,50 @@
+#!/usr/bin/env ruby
+#
+# Note: Ruby 1.9 is faster than 1.8, as expected.
+
+$LOAD_PATH[0,0] = File.join(File.dirname(__FILE__), '..', 'lib')
+require 'mongo'
+
+include XGen::Mongo::Driver
+
+N = 30_000
+
+def report(str, t0, t1, n)
+  dt = t1.to_f - t0.to_f
+  printf("%16s: %03.8f\n", str, dt)
+end
+
+host = ENV['MONGO_RUBY_DRIVER_HOST'] || 'localhost'
+port = ENV['MONGO_RUBY_DRIVER_PORT'] || XGen::Mongo::Driver::Mongo::DEFAULT_PORT
+
+db = Mongo.new(host, port).db('ruby-benchmark')
+db.drop_collection('benchmark')
+coll = db.collection('benchmark')
+
+coll.create_index('foo', 'i')
+
+t0 = Time.new
+N.times { |i| coll.insert('i' => i) }
+db.error                        # forces pause until all finished
+t1 = Time.new
+report('insert', t0, t1, N)
+
+t0 = Time.new
+N.times { coll.find_first }
+t1 = Time.new
+report('find_first', t0, t1, N)
+
+t0 = Time.new
+N.times {
+  coll.find('i' => 3).each { }
+  coll.find('i' => 234).each { }
+  coll.find('i' => 9876).each { }
+}
+t1 = Time.new
+report('find', t0, t1, N * 3)
+
+h = {'i' => {'$gt' => 200, '$lt' => 200}}
+t0 = Time.new
+N.times { coll.find(h).each { } }
+t1 = Time.new
+report('find gt/lt', t0, t1, N)