From: Massimiliano Mirra <list@...>
Date: 2001-12-26T03:47:41+09:00
Subject: [ruby-talk:29414] Surprise (?) with sockets

I took for granted that one socket opening and closing, plus three
puts and gets, would be faster than *three* socket opening and
closing, plus three puts and gets.

Well, it looks like I'm wrong.  In fact this is the output of the
attached code:

Loaded suite Test
Started...
...Three puts and gets with one-time connections: 0.036726 secs
....Three puts and gets with a persistent connection: 0.162311 secs
.
Finished in 0.204511 seconds.
2 runs, 6 assertions, 0 failures, 0 errors

Four times as slow?!  Someone please tell me that there is some
macroscopic mistake in the code below (or that this is a bad dream).



require 'Lapidary/TestCase'

class OneTimeServer 
  def initialize(host, port)
    @server = TCPServer.new(host, port)
  end

  def listen
    while (session = @server.accept)
      session.gets
      session.puts "received"
      session.close
    end
  end
end

class PersistentServer
  def initialize(host, port)
    @server = TCPServer.new(host, port)
  end

  def listen
    while (session = @server.accept)
      while (line = session.gets)
	break if line =~ /quit/
	session.puts "received"
      end
      session.close
    end
  end      
end

def prof(message = nil, &block)
  start = Time.new
  block.call
  time = Time.new - start
  puts "#{message}: #{time} secs" if message
  time 
end

require 'socket'

class Test < Lapidary::TestCase
  def initialize(*args)
    super
    Thread.new { OneTimeServer.new('localhost', 8888).listen }
    Thread.new { PersistentServer.new('localhost', 9999).listen }
  end

  def testOneTime
    prof('Three puts and gets with one-time connections') {
      3.times {
	socket = TCPSocket.new('localhost', 8888)
	socket.puts "something"
	assert_equal "received\n", socket.gets
      }
    }
  end

  def testPersistent
    socket = TCPSocket.new('localhost', 9999)
    prof('Three puts and gets with a persistent connection') {
      3.times {
	socket.puts "something"
	assert_equal "received\n", socket.gets
      }
    }
  end
end


if $0 == __FILE__
  require 'Lapidary/UI/Console/TestRunner'
  Lapidary::UI::Console::TestRunner.run(Test)
end