add AR benchmark - mysql2 looks to be about 19% faster so far

benchmark/active_record.rb

@@ -0,0 +1,39 @@
+# encoding: UTF-8
+$LOAD_PATH.unshift File.expand_path(File.dirname(__FILE__) + '/../lib')
+
+require 'rubygems'
+require 'benchmark'
+require 'active_record'
+require 'ruby-debug'
+
+number_of = 1
+mysql2_opts = {
+  :adapter => 'mysql2',
+  :database => 'test'
+}
+mysql_opts = {
+  :adapter => 'mysql',
+  :database => 'test'
+}
+
+class TestModel < ActiveRecord::Base
+  set_table_name :mysql2_test
+end
+
+Benchmark.bmbm do |x|
+  x.report do
+    TestModel.establish_connection(mysql2_opts)
+    puts "Mysql2"
+    number_of.times do
+      TestModel.all(:limit => 1000)
+    end
+  end
+
+  x.report do
+    TestModel.establish_connection(mysql_opts)
+    puts "Mysql"
+    number_of.times do
+      TestModel.all(:limit => 1000)
+    end
+  end
+end