Vitality

Easily poll the health (cpu & mem) of your server

Install

$ npm install --save vitality-js

Usage

var vitality = require('vitality-js');

// Will poll every 1000ms and give you current memory usage and average cpu utilization over the last 1000ms
vitality.poll(1000, function (health) {
  console.log(health);
  /*
    {
      cpu: [
        { idle: 9500, total: 10300, percent: 7.7669902912621325 },
        { idle: 9500, total: 10100, percent: 5.940594059405946 },
        { idle: 8800, total: 10200, percent: 13.725490196078427 },
        { idle: 9300, total: 10000, percent: 6.999999999999995 }
      ],
      memory: { 
        free: 3688.92578125,
        total: 11835.86328125,
        percent: 31.16735715504487
      }
    }
  */
});

API

vitality.get()

Returns the current memory usage and cpu idle/total.

/*
{
  "cpu": [
    {
      "idle": 567355500,
      "total": 674757500
    },
    {
      "idle": 333779400,
      "total": 445816600
    },
    {
      "idle": 333948500,
      "total": 439120400
    },
    {
      "idle": 338116500,
      "total": 433799200
    }
  ],
  "memory": {
    "free": 3631.984375,
    "total": 11835.86328125,
    "percent": 30.686265029384675
  }
}
*/

vitality.difference(previous, current)

Calculates the cpu utilization between two vitality.get() calls. Also returns memory usage (latest).

/*
{
  "memory": {
    "free": 3561.45703125,
    "total": 11835.86328125,
    "percent": 30.090386705395183
  },
  "cpu": [
    {
      "idle": 52100,
      "total": 56000,
      "percent": 6.964285714285712
    },
    {
      "idle": 52100,
      "total": 56700,
      "percent": 8.112874779541446
    },
    {
      "idle": 51600,
      "total": 56500,
      "percent": 8.672566371681413
    },
    {
      "idle": 52400,
      "total": 56500,
      "percent": 7.256637168141589
    }
  ]
}
*/

vitality.poll(interval, callback)

Polls vitality.get() and returns the difference each interval to callback.

vitality.poll(1000, function (health) {
  /*
    {
      cpu: [
        { idle: 9500, total: 10300, percent: 7.7669902912621325 },
        { idle: 9500, total: 10100, percent: 5.940594059405946 },
        { idle: 8800, total: 10200, percent: 13.725490196078427 },
        { idle: 9300, total: 10000, percent: 6.999999999999995 }
      ],
      memory: { 
        free: 3688.92578125,
        total: 11835.86328125,
        percent: 31.16735715504487
      }
    }
  */
});

vitality.cpu.get()

/*
[
  {
    "idle": 570766400,
    "total": 678605700
  },
  {
    "idle": 337235700,
    "total": 449659100
  },
  {
    "idle": 337348500,
    "total": 442980100
  },
  {
    "idle": 341598300,
    "total": 437648400
  }
]
*/

vitality.cpu.difference(previous, current)

Calculates the cpu utilization between two vitality.get() calls.

/*
[
  {
    "idle": 61700,
    "total": 66400,
    "percent": 7.078313253012047
  },
  {
    "idle": 62900,
    "total": 66500,
    "percent": 5.41353383458647
  },
  {
    "idle": 60900,
    "total": 66600,
    "percent": 8.558558558558559
  },
  {
    "idle": 62600,
    "total": 66900,
    "percent": 6.427503736920781
  }
]
*/

vitality.cpu.poll(interval, callback)

Polls vitality.cpu.get() and returns the difference each interval to callback.

/*
[
  {
    "idle": 9500,
    "total": 9800,
    "percent": 3.0612244897959218
  },
  {
    "idle": 9200,
    "total": 9500,
    "percent": 3.157894736842104
  },
  {
    "idle": 9300,
    "total": 10000,
    "percent": 6.999999999999995
  },
  {
    "idle": 9600,
    "total": 9900,
    "percent": 3.0303030303030276
  }
]
*/

vitality.memory.get()

Return free/used memory.

/*
{
  free: 3644.390625,
  total: 11835.86328125,
  percent: 30.791084168514587
}
*/