h.js

console.log(process.argv[2]);

switch (process.argv[2]) {
  case 'child':
    return child();
  case undefined:
    return parent();
  default:
    throw new Error('wtf');
}

function parent() {
  var http = require('http');

  var server = http.createServer(function(req, res) {
    var bigResponse = new Buffer(10240).fill('x');
    res.end(bigResponse);
  });
  server.listen(10007, function() {
    console.error('spawning children');
    var spawn = require('child_process').spawn;
    var node = process.execPath;
    var args = [__filename, 'child'];
    var opt = {}; // stdio: 'inherit' };
    var c1 = spawn(node, args.concat('1'), opt);
    var c2 = spawn(node, args.concat('2'), opt);
    var c3 = spawn(node, args.concat('3'), opt);
    var c4 = spawn(node, args.concat('4'), opt);
    setInterval(function() {
      console.error('master: %j', process.memoryUsage());
    }, 1000);
  });
}

function child() {
  var net = require('net');
  var conn = net.connect({ port: 10007 });
  var req = 'GET / HTTP/1.1\r\nHost: localhost:10007\r\nAccept: */*\r\n\r\n';
  req = new Array(10241).join(req);
  conn.on('connect', function() {
    write();
  });
  conn.on('drain', write);
  function write() {
    console.error('%s: write requests', process.argv[3]);
    var i = 1;
    while (false !== conn.write(req, 'ascii')) i++;
    console.error('%s: wrote %d of request', process.argv[3], i * req.length);
  }
}