gistfile1.rb

require "rubygems"
require "active_record"
require 'mysqlplus'

Mysql.class_eval { alias :query :async_query }
 
ActiveRecord::Base.establish_connection(
  :adapter => "mysql",
  :username => "root",
  :database => "test",
  :pool => 40
)
 
threads = []

40.times do
  threads << Thread.new do
    ActiveRecord::Base.connection_pool.with_connection do |conn|
      res = conn.execute("select sleep(1)")
    end
  end
end
 
# block and wait for all threads to finish
threads.each { |t| t.join }