Multi-process across all CPU cores

server/index.js

@@ -1,9 +1,26 @@
 const express = require('express');
 const path = require('path');
+const cluster = require('cluster');
+const numCPUs = require('os').cpus().length;
 
-const app = express();
 const PORT = process.env.PORT || 5000;
 
+// Multi-process to utilize all CPU cores.
+if (cluster.isMaster) {
+  console.error(`Node cluster master ${process.pid} is running`);
+
+  // Fork workers.
+  for (let i = 0; i < numCPUs; i++) {
+    cluster.fork();
+  }
+
+  cluster.on('exit', (worker, code, signal) => {
+    console.error(`Node cluster worker ${worker.process.pid} exited: code ${code}, signal ${signal}`);
+  });
+
+} else {
+  const app = express();
+
   // Priority serve any static files.
   app.use(express.static(path.resolve(__dirname, '../react-ui/build')));
 
@@ -19,5 +36,6 @@ app.get('*', function(request, response) {
   });
 
   app.listen(PORT, function () {
-  console.log(`Listening on port ${PORT}`);
+    console.error(`Node cluster worker ${process.pid}: listening on port ${PORT}`);
   });
+}