Convert the output of os.cpus() in Node.js to percentage

Question

Is there a way to convert the os.cpus() info to percentage? Just like the output of iostat (on the CPU section).

My code:

var os = require(\'os\');
c         


        

Answer 1

If you are looking at the CPU Usage per process try node-usage

Answer 2

a simple hack:

var os = require('os')
var samples = []
var prevCpus = os.cpus()

setInterval(sample,100)
setInterval(print,1000)

function print() {
  var result = {last10:null, last50:null, last100:null}
  var percent = 0
  var i = samples.length
  var j = 0
  while (i--) {
    j++
    if (samples[i].total > 0)
      percent += (100 - Math.round(100 * samples[i].idle / samples[i].total))
    if (j == 10)       result.last10  = percent/j   
    else if (j == 50)  result.last50  = percent/j    
    else if (j == 100) result.last100 = percent/j
  }
  console.log(result)
}

function sample() {
  currCpus = os.cpus()
  for (var i=0,len=currCpus.length;i<len;i++) {
    var prevCpu = prevCpus[i]
    var currCpu = currCpus[i]
    var deltas = {total:0}
    for (var t in prevCpu.times) 
      deltas.total += currCpu.times[t] - prevCpu.times[t]
    for (var t in prevCpu.times) 
      deltas[t] = currCpu.times[t] - prevCpu.times[t]
  }
  prevCpus = currCpus
  samples.push(deltas)
  if (samples.length>100) samples.shift()
}

you could use a metrics-lib like https://github.com/felixge/node-measured to plumb something more prolific