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

const cluster = require("cluster");
const physicalCpuCount = require("physical-cpu-count")

if (cluster.isPrimary) {
  console.log(`Primary ${process.pid} is running`);

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

  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`);
  });
} else {
  // worker task
  require("./create-server");
}