foo.rb

class Foo
  def threaded_upload
    t1 = Time.now
    threads = []

    100.times do |i|
      threads << Thread.new(i) do |i|
        uploader = Attachment::Uploader.new
        uploader.upload("0" * 20 * 1024, "threaded/#{i}")
      end
    end

    threads.each(&:join)
    puts "Total Time: #{Time.now - t1} seconds"
  end

  def upload
    t1 = Time.now
    uploader = Attachment::Uploader.new

    100.times do |i|
      uploader.upload("0" * 20 * 1024, "regular/#{i}")
    end
    puts "Total Time: #{Time.now - t1} seconds"
  end
end