keep_alive_client.rb

class Net::BufferedIO #:nodoc:
  alias :old_rbuf_fill :rbuf_fill
  def rbuf_fill
    if @io.respond_to?(:read_nonblock)
      begin
        @rbuf << @io.read_nonblock(65536)
      rescue Errno::EWOULDBLOCK
        if IO.select([@io], nil, nil, @read_timeout)
          @rbuf << @io.read_nonblock(65536)
        else
          raise Timeout::TimeoutError
        end
      end
    else # SSL sockets do not have read_nonblock
      timeout(@read_timeout) {
        @rbuf << @io.sysread(65536)
      }
    end
  end
end

class KeepAliveClient
  @@mutex = Mutex.new
  @@connection_cache = Hash.new { |h,k|
    h[k] = {
      :connection => Net::HTTP.new(*k.split(':')).start,
      :options    => {}
    }
  }

  class << self
    def get uri
      cache       = @@connection_cache["#{uri.host}:#{uri.port}"]
      connection  = cache[:connection]
      opts        = cache[:options]

      @@mutex.synchronize {
        res = connection.get(uri.path, {
          'Connection' => 'keep-alive',
          'Keep-Alive' => '300',
        })
      }
    end
  end
end

results.txt

                user     system      total        real
net/http    0.600000   0.290000   0.890000 ( 17.072703)
net/http2   0.570000   0.260000   0.830000 (  5.463130)
curb        0.110000   0.150000   0.260000 ( 18.505145)
multicurb   0.360000   1.160000   1.520000 (  4.958537)

speed_test.rb

require 'net/http'
require 'uri'
require 'benchmark'
require 'rubygems'
require 'curb'
require 'keep_alive_client'

N = 100
URL = 'http://www.pauldix.net/'
p_url = URI.parse(URL)

Benchmark.bm(10) do |x|
  x.report('net/http') {
    N.times {
      Net::HTTP.get(p_url)
    }
  }

  x.report('net/http2') {
    N.times {
      KeepAliveClient.get(p_url)
    }
  }

  x.report('curb') {
    N.times {
      c = Curl::Easy.perform(URL)
    }
  }

  x.report('multicurb') {
    multi = Curl::Multi.new
    N.times do
      easy = Curl::Easy.new(URL) do |curl|
        curl.on_success do |c|
          c.response_code
        end
        curl.on_failure do |c|
          puts "**** #{c.response_code}"
        end
      end
      multi.add(easy)
    end
    multi.perform
  }
end