Added cluster server for testing

Author: mcollina

cluster.js

@@ -0,0 +1,26 @@
+'use strict'
+
+const cluster = require('cluster')
+const http = require('http')
+const numCPUs = Math.floor(require('os').cpus().length / 2) || 1
+
+if (cluster.isMaster) {
+  console.log(`Master ${process.pid} is running`)
+
+  for (let i = 0; i < numCPUs; i++) {
+    cluster.fork()
+  }
+
+  cluster.on('exit', (worker, code, signal) => {
+    console.log(`worker ${worker.process.pid} died`)
+  })
+} else {
+  // Workers can share any TCP connection
+  // In this case it is an HTTP server
+  http.createServer((req, res) => {
+    res.writeHead(200)
+    res.end('hello world\n')
+  }).listen(3000)
+
+  console.log(`Worker ${process.pid} started`)
+}