TechEmpower.FrameworkBenchmarks/frameworks/JavaScript/koa/app.js

const cluster = require('cluster');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  console.log('Master starting ' + new Date().toISOString());
  cluster.on('exit', () => {
    process.exit(1);
  });
} else {
  // worker task
  require('./create-server');
}