What will be the output if you run this code on a machine with 2 CPU cores?

What will be the output if you run this code on a machine with 2 CPU cores?

const cluster = require('cluster');
const os = require('os');
if (cluster.isPrimary) {
  console.log('Primary process');
  for (let i = 0; i < os.cpus().length; i++) {
    cluster.fork();
  }
} else {
  console.log('Worker process');
}