nodejs domain module hello world and benchmark

domain: Domains provide a way to handle multiple different IO operations as a single group.

Example: http hello world using domain

var domain = require('domain');
var http = require('http');

var domainMiddleware = function (req, res, next, errorHandle) {
  var d = domain.create();
  d.once('error', errorHandle);
  d.run(next);
};

var app = http.createServer(function (req, res) {
  domainMiddleware(req, res, function () {
    // normal response
    if (req.url === '/error') {
      process.nextTick(function () {
        var a = null;
        a.foo();
      });
      return;
    }
    res.end('hello domain');
  }, function (err) {
    // sending err response
    res.statusCode = 500;
    res.end(err.stack);
  });
});

app.listen(1984);

Benchmark

Results: QPS reduced by 8%

hello world

var appNoDomain = http.createServer(function (req, res) {
  if (req.url === '/error') {
    process.nextTick(function () {
      var a = null;
      a.foo();
    });
    return;
  }
  res.end('hello domain');
});
appNoDomain.listen(1985);
$ siege -c 100 -b -t 10s http://127.0.0.1:1985/
$ siege -c 100 -b -t 10s http://127.0.0.1:1985/
** SIEGE 2.72
** Preparing 100 concurrent users for battle.
The server is now under siege...
Lifting the server siege...      done.

Transactions:          73806 hits
Availability:         100.00 %
Elapsed time:           9.68 secs
Data transferred:         0.84 MB
Response time:            0.01 secs
Transaction rate:      7624.59 trans/sec
Throughput:           0.09 MB/sec
Concurrency:           99.69
Successful transactions:       73806
Failed transactions:             0
Longest transaction:          0.05
Shortest transaction:         0.00

hello world with domain

$ siege -c 100 -b -t 10s http://127.0.0.1:1984/
$ siege -c 100 -b -t 10s http://127.0.0.1:1984/
** SIEGE 2.72
** Preparing 100 concurrent users for battle.
The server is now under siege...
Lifting the server siege...      done.

Transactions:          70759 hits
Availability:         100.00 %
Elapsed time:          10.01 secs
Data transferred:         0.81 MB
Response time:            0.01 secs
Transaction rate:      7068.83 trans/sec
Throughput:           0.08 MB/sec
Concurrency:           98.86
Successful transactions:       70759
Failed transactions:             0
Longest transaction:          0.10
Shortest transaction:         0.00

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