clustering

Node processes run in a single thread limited by default to 512Mb on 32-bit machines and 1Gb on 64-bit.

In order to avoid processing power bottlenecks the cluster module can be used to split a single process into multiple ones (workers). Child processes share the same server ports with the master process.

Import the cluster module:

var cluster = require('cluster');

As a cluster module executes the same Node process multiple times, you need to find what portion of the code is executed by the children or master. Identify the master process:

if(cluster.isMaster) { ... };

You can then initiate the master process as it will initiate other worker processes:

cluster.fork();

Most used events contained by clusters are the online and exit emitted either when the worker process is forked or when the worker process is terminated.