AR perf test: switch to mysql2, bundle faker and rbench

Gemfile

@@ -13,6 +13,10 @@ gem "mocha", ">= 0.9.8"
 gem "rdoc",  ">= 2.5.10"
 gem "horo",  ">= 1.0.2"
 
+# for perf tests
+gem "faker"
+gem "rbench"
+
 # AS
 gem "memcache-client", ">= 1.8.5"
 
@@ -22,6 +26,7 @@ gem "text-format", "~> 1.0.0"
 platforms :mri_18 do
   gem "system_timer"
   gem "ruby-debug", ">= 0.10.3"
+  gem 'ruby-prof'
 end
 
 platforms :mri_19 do

activerecord/examples/performance.rb

@@ -14,7 +14,7 @@
 require File.expand_path("../../../load_paths", __FILE__)
 require "active_record"
 
-conn = { :adapter => 'mysql',
+conn = { :adapter => 'mysql2',
   :database => 'activerecord_unittest',
   :username => 'rails', :password => '',
   :encoding => 'utf8' }