clustery.js

#!/usr/bin/env NSOLID_APPNAME=clustery NSOLID_HUB=4001 nsolid

//------------------------------------------------------------------------------
// clustery is a program that uses the Node.js cluster module to launch
// a number of worker processes, that eat your CPU soring arrays of random
// numbers.  It's intended as a sample program for N|Solid.
//
// If you have N|Solid installed, you can monitor the clustery master and
// workers with the command:
//
//   NSOLID_APPNAME=clustery NSOLID_HUB=4001 nsolid clustery
//
// Then head over to your N|Solid console, maybe at http://localhost:3000 ,
// to watch the magic unfold.
//------------------------------------------------------------------------------

"use strict"

// see: https://nodejs.org/api/cluster.html
const cluster = require("cluster")

// if the single master, run master(), otherwise run as a worker
cluster.isMaster ? master() : worker()

//------------------------------------------------------------------------------
function master() {
  // set the process name for `ps`
  process.title = "clustery master"

  console.log(`starting master`)

  // fork a worker for the # of CPUs you have
  require("os").cpus().forEach( cpu => cluster.fork() )
}

//------------------------------------------------------------------------------
function worker() {
  // set the process name for `ps`
  process.title = `clustery worker ${cluster.worker.id}`

  console.log(`starting worker ${cluster.worker.id}`)

  // do something, interval based on your worker index (0..workers)
  setInterval(doSomething, cluster.worker.id * 10)
}

//------------------------------------------------------------------------------
function doSomething() {
  // create an array of random numbers, then sort them.  woo!

  const SIZE = 5000
  const arr  = []

  for (let i=0; i<SIZE; i++) {
    arr.push(Math.random())
  }

  arr.sort()
}