multi_bench.js

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

if (cluster.isMaster) {
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork()
  }
} else {
  performance.mark('start')
  let s = 0
  for (var i = 0; i < 100000; ++i) {
    s += Math.random()
  }
  performance.mark('end')
  performance.measure('duration', 'start', 'end')
  let measure = performance.getEntriesByName('duration')[0]
  console.log(measure.duration)
  cluster.worker.kill()
}