benchmark.log

`node --nouse-idle-notification --expose-gc --max-old-space-size=8192 testserver.js`

This is ApacheBench, Version 2.3 <$Revision: 1706008 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done


Server Software:
Server Hostname:        localhost
Server Port:            8890

Document Path:          /
Document Length:        25 bytes

Concurrency Level:      1
Time taken for tests:   0.078 seconds
Complete requests:      10
Failed requests:        0
Total transferred:      1000 bytes
HTML transferred:       250 bytes
Requests per second:    128.23 [#/sec] (mean)
Time per request:       7.798 [ms] (mean)
Time per request:       7.798 [ms] (mean, across all concurrent requests)
Transfer rate:          12.52 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.1      0       0
Processing:     1    8   7.8      4      20
Waiting:        1    5   5.0      4      13
Total:          1    8   7.8      4      20

Percentage of the requests served within a certain time (ms)
  50%      4
  66%      7
  75%     16
  80%     19
  90%     20
  95%     20
  98%     20
  99%     20
 100%     20 (longest request)

testserver.js

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

if(cluster.isMaster) {
  var numWorkers = require('os').cpus().length;

  console.log('Master cluster setting up ' + numWorkers + ' workers...');

  for(var i = 0; i < numWorkers; i++) {
    cluster.fork();
  }

  cluster.on('online', function(worker) {
    console.log('Worker ' + worker.process.pid + ' is online');
  });

  cluster.on('exit', function(worker, code, signal) {
    console.log('Worker ' + worker.process.pid + ' died with code: ' + code + ', and signal: ' + signal);
    console.log('Starting a new worker');
    cluster.fork();
  });
} else {
  http.createServer(function(req, res) {
    res.writeHead(200);
    res.end('process ' + process.pid + ' says hello!');
  }).listen(8890);
}