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Node.js | os.loadavg() Method
  • Last Updated : 31 Jan, 2020

The os.loadavg() method is an inbuilt application programming interface of the os module which is used to get load average. Load average is a measure of system activity, expressed in fractional number, calculated by operating system.

Syntax:

os.loadavg()

Parameters: This method does not accept any parameters.

Return Value: This method returns an array containing fractional number of size three signifies 1, 5 and 15 minutes load average calculated by the operating system. On windows, it will return [0, 0, 0] as load average is Unix-Specific concept.

Below examples illustrate the use of os.loadavg() method in Node.js:



Example 1:




// Node.js program to demonstrate the    
// os.loadavg() method 
     
// Run in Linux system
// Require os module
const os = require('os');
  
// Printing os.loadavg() value
console.log(os.loadavg());


Output:

[ 13.42041015625, 12.95166015625, 12.72509765625 ]

Example 2:




// Node.js program to demonstrate the    
// os.loadavg() method 
     
// Run on Windows system
// Require os module
const os = require('os');
  
// Printing os.loadavg() value
console.log(os.loadavg());


Output:

[ 0, 0, 0 ]

Example 3:




// Node.js program to demonstrate the    
// os.loadavg() method 
     
// Require os module
const os = require('os');
  
// Printing os.loadavg() value
var avg_load = os.loadavg();
  
console.log("Load average (1 minute):"
            + String(avg_load[0]));
  
console.log("Load average (5 minute):"
            + String(avg_load[1]));
  
console.log("Load average (15 minute):"
            + String(avg_load[2]));


Output:

Load average (1 minute):15.87158203125
Load average (5 minute):14.193359375
Load average (15 minute):13.365234375

Note: The above program will compile and run by using the node index.js command.

Reference: https://nodejs.org/api/os.html#os_os_loadavg

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