npm install os-monitor

var monitor = require("os-monitor");


// basic usage
monitor.start();

// more advanced usage with configs.
monitor.start({ delay: 3000 // interval in ms between monitor cycles
              , freemem: 1000000000 // freemem under which event 'freemem' is triggered
              , uptime: 1000000 // number of secs over which event 'uptime' is triggered
              , critical1: 0.7 // loadavg1 over which event 'loadavg1' is triggered
              , critical5: 0.7 // loadavg5 over which event 'loadavg5' is triggered
              , critical15: 0.7 // loadavg15 over which event 'loadavg15' is triggered
              , silent: false // set true to mute event 'monitor'
              , stream: false // set true to enable the monitor as a Readable Stream
              , immediate: false // set true to execute a monitor cycle at start()
              });


// define handler that will always fire every cycle
monitor.on('monitor', function(event) {
  console.log(event.type, ' This event always happens on each monitor cycle!');
});

// define handler for a too high 1-minute load average
monitor.on('loadavg1', function(event) {
  console.log(event.type, ' Load average is exceptionally high!');
});

// define handler for a too low free memory
monitor.on('freemem', function(event) {
  console.log(event.type, 'Free memory is very low!');
});

// define a throttled handler, using Underscore.js's throttle function (http://underscorejs.org/#throttle)
monitor.throttle('loadavg5', function(event) {

  // whatever is done here will not happen
  // more than once every 5 minutes(300000 ms)

}, monitor.minutes(5));


// change config while monitor is running
monitor.config({
  freemem: 0.3 // alarm when 30% or less free memory available
});


// stop monitor
monitor.stop();


// check whether monitor is running or not
monitor.isRunning(); // -> true / false


// use as readable stream
monitor.start({stream: true}).pipe(process.stdout);

monitor.seconds(10); // -> 10000 ms

monitor.minutes(5); // -> 300000 ms

monitor.hours(1); // -> 3600000 ms

monitor.days(1); // -> 86400000 ms

// start with a delay of 5000 ms
monitor.start({ delay: monitor.seconds(5) });

{
  type: 'monitor', // event type
  loadavg: [ 0.4599609375, 0.53076171875, 0.4990234375 ], // load average values for 1, 5, 15 minutes
  uptime: 1614056, // os uptime in seconds
  freemem: 241262592, // free memory available in bytes
  totalmem: 2147483648, // total memory available in bytes
  timestamp: 1394766898 // UNIX Timestamp
}

monitor.start({ stream: true });


// write to STDOUT
monitor.pipe(process.stdout);


// write to a file
var fs = require('fs'),
    logFile = fs.createWriteStream('/tmp/log.txt', {flags: 'a'});

monitor.pipe(logFile);

var osm = require('os-monitor');

var monitor1 = new osm.Monitor();
var monitor2 = new osm.Monitor();
var monitor3 = new osm.Monitor();

var osm = require('os-monitor');

var type = osm.os.type();
var cpus = osm.os.cpus();