node/benchmark/net/net-pipe.js

// test the speed of .pipe() with sockets

var common = require('../common.js');
var PORT = common.PORT;

var bench = common.createBenchmark(main, {
  len: [102400, 1024 * 1024 * 16],
  type: ['utf', 'asc', 'buf'],
  dur: [5],
});

var dur;
var len;
var type;
var chunk;
var encoding;

function main(conf) {
  dur = +conf.dur;
  len = +conf.len;
  type = conf.type;

  switch (type) {
    case 'buf':
      chunk = new Buffer(len);
      chunk.fill('x');
      break;
    case 'utf':
      encoding = 'utf8';
      chunk = new Array(len / 2 + 1).join('ü');
      break;
    case 'asc':
      encoding = 'ascii';
      chunk = new Array(len + 1).join('x');
      break;
    default:
      throw new Error('invalid type: ' + type);
      break;
  }

  server();
}

var net = require('net');

function Writer() {
  this.received = 0;
  this.writable = true;
}

Writer.prototype.write = function(chunk, encoding, cb) {
  this.received += chunk.length;

  if (typeof encoding === 'function')
    encoding();
  else if (typeof cb === 'function')
    cb();

  return true;
};

// doesn't matter, never emits anything.
Writer.prototype.on = function() {};
Writer.prototype.once = function() {};
Writer.prototype.emit = function() {};


function Reader() {
  this.flow = this.flow.bind(this);
  this.readable = true;
}

Reader.prototype.pipe = function(dest) {
  this.dest = dest;
  this.flow();
  return dest;
};

Reader.prototype.flow = function() {
  var dest = this.dest;
  var res = dest.write(chunk, encoding);
  if (!res)
    dest.once('drain', this.flow);
  else
    process.nextTick(this.flow);
};


function server() {
  var reader = new Reader();
  var writer = new Writer();

  // the actual benchmark.
  var server = net.createServer(function(socket) {
    socket.pipe(socket);
  });

  server.listen(PORT, function() {
    var socket = net.connect(PORT);
    socket.on('connect', function() {
      bench.start();

      reader.pipe(socket);
      socket.pipe(writer);

      setTimeout(function() {
        // multiply by 2 since we're sending it first one way
        // then then back again.
        var bytes = writer.received * 2;
        var gbits = (bytes * 8) / (1024 * 1024 * 1024);
        bench.end(gbits);
      }, dur * 1000);
    });
  });
}