% CPU in Node.JS

avgLoad.js

const os = require("os");

//Create function to get CPU information
function cpuAverage() {

  //Initialise sum of idle and time of cores and fetch CPU info
  var totalIdle = 0, totalTick = 0;
  var cpus = os.cpus();

  //Loop through CPU cores
  for (var i = 0, len = cpus.length; i < len; i++) {

    //Select CPU core
    var cpu = cpus[i];

    //Total up the time in the cores tick
    for (type in cpu.times) {
      totalTick += cpu.times[type];
    }

    //Total up the idle time of the core
    totalIdle += cpu.times.idle;
  }

  //Return the average Idle and Tick times
  return {idle: totalIdle / cpus.length, total: totalTick / cpus.length};
}

// function to calculate average of array
const arrAvg = function (arr) {
  if (arr && arr.length >= 1) {
    const sumArr = arr.reduce((a, b) => a + b, 0)
    return sumArr / arr.length;
  }
};

// load average for the past 1000 milliseconds calculated every 100
function getCPULoadAVG(avgTime = 1000, delay = 100) {

  return new Promise((resolve, reject) => {

    const n = ~~(avgTime / delay);
    if (n <= 1) {
      reject('Error: interval to small');
    }

    let i = 0;
    let samples = [];
    const avg1 = cpuAverage();

    let interval = setInterval(() => {
      console.debug('CPU Interval: ', i);

      if (i >= n) {
        clearInterval(interval);
        resolve(~~((arrAvg(samples) * 100)));
      }

      const avg2 = cpuAverage();
      const totalDiff = avg2.total - avg1.total;
      const idleDiff = avg2.idle - avg1.idle;

      samples[i] = (1 - idleDiff / totalDiff);

      i++;

    }, delay);

  });

}

getCPULoadAVG(1000, 100).then((avg) => {
  console.log(avg);
});

This is to be honest the only right one i could find that actually gives a correct average

Hey there! Thank you. This was the only one that I found that showed the same values as in htop. I created an NPM package with your code: https://github.com/felipebutcher/node-os-info

Thank you Felipe, you are welcome.
Also you have been very kind linking this gist to your repository. :)

Sadly, in my case it just reports some random numbers. Still thank you

Sadly, in my case it just reports some random numbers. Still thank you

@Guitarman051120 What OS are you using?

it give global os cpu usage, no current application usage
My os 12%
app 4%
this show 12%

bullshit

Thank you @djmisterjon for your kind comment. Anyway, no one said that this gives information about the current nodejs application.
This gives information about CPU percentage occupation of the entire host.

thanks for sharing @GaetanoPiazzolla

@djmisterjon Don't be an asshole dude. The author kindly shared his code which works. I use linux but I tested myself in Windows. You're are using nwjs which is a hack to run node inside a browser. This is not even a real node application. Of course it won't work.

This is not even a real node application

what wrong with you, bullshit!

And why assault and insult people for free ?
Go health your brain and also look for your language young boy.

@djmisterjon you came to the gist that the guy kindly shared and commented "bullshit". that's an asshole attitude. am i the one insulting people here? come on.

Hey there! Thank you. This was the only one that I found that showed the same values as in htop. I created an NPM package with your code: https://github.com/felipebutcher/node-os-info

sir im used your npm module from your git!
i want to use it in my bot command but it support only callback values.
please help me to use it in a variable that i can pass that into my bot response.
like this:-

Total Memory : ${totalram}GB
Free Memory : ${totalfreeram}GB
Used Memory : ${total_used}GB

I tried different things but your code brings out the most accurate readings. I tried and tested it, Thanks, mate