em_leak.rb

require 'eventmachine'
require 'em-http'

module SCEA
  class Server

    def self.start
      new_size = EventMachine.set_descriptor_table_size(20000)
      puts "New fd table size is: #{new_size}"

      EventMachine.epoll  # use epoll where available
      EventMachine.run do
        EventMachine.add_periodic_timer(5){ HttpFetcher.do_it }
      end
    end

  end

  class HttpFetcher
    def self.do_it
      begin
        http = EventMachine::HttpRequest.new('https://gist.github.com/raw/8ea88329fdc71337c95a/5356f2dca3615022050d0c91930ddb333eb2819d/gistfile1.xsl').get(
        :head => {
          'User-Agent'   => 'ruby-test',
          'X-Test'       => 'test'
        }
        )
        http.callback do
          if http.response_header.status != 200
            puts "request failed: #{http.response_header.http_status} #{http.response_header.http_reason}"
          else
            puts "request succeeded: #{http.response_header.http_status} #{http.response_header.http_reason}"
          end
        end

        http.errback do
          errors = http.errors && http.errors != '' ? http.errors : 'Unknown error (server down?)'
          puts "request failed: #{errors}"
        end
      rescue => e
        puts "Failure (exception): #{e.prettify}"
      end
    end
  end
end

SCEA::Server.start