gistfile1.rb

require 'rubygems'
require 'sinatra'

# eventmachine/thin
require 'eventmachine'
require 'thin'

# mysql
require 'mysqlplus'

# single threaded
  # DB = Mysql.connect

# fibered
  require 'neverblock'
  require 'never_block/servers/thin'
  require 'neverblock-mysql'
  class Thin::Server
    def fiber_pool() @fiber_pool ||= NB::Pool::FiberPool.new(20) end
  end
  DB = NB::DB::PooledDBConnection.new(20){ NB::DB::FMysql.connect }

# threaded
  # def (Sinatra::Application).deferred?(env) true end
  # class Mysql
  #   alias :sync_query :query
  #   alias :query :async_query
  # end
  # 
  # require 'sequel_core'
  # DB = Sequel::ConnectionPool.new(:max_connections => 20){ Mysql.connect }
  # def DB.query sql
  #   hold do |conn|
  #     conn.query(sql)
  #   end
  # end

disable :reload

get '/' do
  4.times do
    DB.query('select sleep(0.25)')
  end
  'done'
end