Run webapp on more than 1 thread

webapp.js

@@ -179,14 +179,32 @@ function killOldInvites(){
     })
 }
 killOldInvites()
-setInterval(() => {
-    killOldInvites()
-}, 3600000)
+
 
 var shortenedLinks = {}
 loadFromFile((result) => {
     shortenedLinks = result
-    rootserver.listen(PORT);
+    const cluster = require('cluster');
+    const http = require('http');
+    const numCPUs = require('os').cpus().length;
+        
+    if (cluster.isMaster) {
+      // Fork workers.
+        setInterval(() => {
+            if (cluster.isMaster) {
+                killOldInvites()
+            }
+        }, 3600000)
+      for (let i = 0; i < numCPUs; i++) {
+        cluster.fork();
+      }
+    
+      cluster.on('exit', (thread, code, signal) => {
+        console.log(`thread ${thread.process.pid} died`, code, signal)
+      });
+    } else {
+        rootserver.listen(PORT)
+    }      
 })
 
 console.log('SyncLounge WebApp successfully started on port ' + PORT)