Node spawn delay test

node_spawn_delay_test.js

const cluster = require('cluster');

if(cluster.isMaster){
function test(num){
  let workers = {};
  let count = num;
  for (let i = 0; i < num; i++) {
    workers[i] = [];
    workers[i].push((new Date).getTime());
    const worker = cluster.fork();
    workers[i].push(worker);
    const workernum = i;
    worker.on('online', function () {
      workers[workernum].push((new Date).getTime() - workers[i][0])
    });
    worker.on('message', function (message) {
      if(! --count){
        let total = 0;
        Object.keys(workers).forEach(key=>{
          workers[key][1].kill()
          total = total + workers[key][2]
        });
        console.log(`${num}  -----   ${total/num}`)
        setImmediate(()=> test(num + (num/5)*5))
      }
    });
  }
}
  test(5)
} else{
    process.send(new Date().getMilliseconds());
    setTimeout(process.exit, 600000);
}