test_script.rb

#!/usr/bin/env ruby

require 'thread'

require 'rubygems'
require 'typhoeus'

mutex = Mutex.new

100000.times do |t| 
 Thread.new do
   puts "requesting - #{t}"
   req = Typhoeus::Request.new("http://#{ARGV[0]}:#{ARGV[1]}",
                               :method  => :post,
                               :body    => "something=somethingelse")

   # this is still problematic: see all the shared state in
   #   https://github.com/dbalatero/typhoeus/blob/master/lib/typhoeus/hydra.rb
   Typhoeus::Hydra.hydra.queue req 

   mutex.synchronize do
     Typhoeus::Hydra.hydra.run
   end 

 end 
end

test_server.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'sinatra'

post '/' do
  "hello there!"
end