pidusage

What is pidusage?

The pidusage npm package is a cross-platform process and system monitoring library. It provides statistics such as CPU usage, memory usage, running time, and more for a given process ID (PID). It's particularly useful for monitoring the resource consumption of processes in Node.js applications.

What are pidusage's main functionalities?

Process Statistics

This feature allows you to monitor the resource usage of a specific process. The code sample demonstrates how to get statistics such as CPU and memory usage for the current process.

const pidusage = require('pidusage');
pidusage(process.pid, function (err, stats) {
  console.log(stats);
});

Monitoring Multiple PIDs

Pidusage also supports monitoring multiple processes at once. This code sample shows how to get statistics for multiple PIDs simultaneously.

const pidusage = require('pidusage');
pidusage([1234, 5678], function (err, stats) {
  console.log(stats);
});

Other packages similar to pidusage

ps-node

A library for looking up processes running on the system. While ps-node focuses more on finding and interacting with processes, pidusage specializes in monitoring their resource usage.

systeminformation

This package provides a broad set of system and OS metrics, including process monitoring. Compared to pidusage, systeminformation offers a wider range of system-related information but might be more complex to use for simple process monitoring tasks.

README

pidusage

Cross-platform process cpu % and memory usage of a PID.

Synopsis

Ideas from https://github.com/arunoda/node-usage but with no C-bindings.

Please note that if you need to check a Node.JS script process cpu and memory usage, you can use process.cpuUsage and process.memoryUsage since node v6.1.0. This script remain useful when you have no control over the remote script, or if the process is not a Node.JS process.

Usage

var pidusage = require('pidusage')

// Compute statistics every second:
setInterval(function () {
  pidusage(process.pid, function (err, stats) {
    console.log(stats)
    // => {
    //   cpu: 10.0,            // percentage (from 0 to 100*vcore)
    //   memory: 357306368,    // bytes
    //   ppid: 312,            // PPID
    //   pid: 727,             // PID
    //   ctime: 867000,        // ms user + system time
    //   elapsed: 6650000,     // ms since the start of the process
    //   timestamp: 864000000  // ms since epoch
    // }
  })
}, 1000)

// It supports also multiple pids
pidusage([727, 1234], function (err, stats) {
  console.log(stats)
  // => {
  //   727: {
  //     cpu: 10.0,            // percentage (from 0 to 100*vcore)
  //     memory: 357306368,    // bytes
  //     ppid: 312,            // PPID
  //     pid: 727,             // PID
  //     ctime: 867000,        // ms user + system time
  //     elapsed: 6650000,     // ms since the start of the process
  //     timestamp: 864000000  // ms since epoch
  //   },
  //   1234: {
  //     cpu: 0.1,             // percentage (from 0 to 100*vcore)
  //     memory: 3846144,      // bytes
  //     ppid: 727,            // PPID
  //     pid: 1234,            // PID
  //     ctime: 0,             // ms user + system time
  //     elapsed: 20000,       // ms since the start of the process
  //     timestamp: 864000000  // ms since epoch
  //   }
  // }
})

// If no callback is given it returns a promise instead
const stats = await pidusage(process.pid)
console.log(stats)
// => {
//   cpu: 10.0,            // percentage (from 0 to 100*vcore)
//   memory: 357306368,    // bytes
//   ppid: 312,            // PPID
//   pid: 727,             // PID
//   ctime: 867000,        // ms user + system time
//   elapsed: 6650000,     // ms since the start of the process
//   timestamp: 864000000  // ms since epoch
// }

Compatibility

Property	Linux	FreeBSD	NetBSD	SunOS	macOS	Win	AIX	Alpine
cpu	✅	❓	❓	❓	✅	ℹ️	❓	✅
memory	✅	❓	❓	❓	✅	✅	❓	✅
pid	✅	❓	❓	❓	✅	✅	❓	✅
ctime	✅	❓	❓	❓	✅	✅	❓	✅
elapsed	✅	❓	❓	❓	✅	✅	❓	✅
timestamp	✅	❓	❓	❓	✅	✅	❓	✅

✅ = Working ℹ️ = Not Accurate ❓ = Should Work ❌ = Not Working

Please if your platform is not supported or if you have reported wrong readings file an issue.

API

pidusage(pids, [options = {}], [callback]) ⇒ [Promise.<Object>]

Get pid informations.

Kind: global function Returns: Promise.<Object> - Only when the callback is not provided. Access: public

Param	Type	Description
pids	Number | Array.<Number> | String | Array.<String>	A pid or a list of pids.
[callback]	function	Called when the statistics are ready. If not provided a promise is returned instead.

pidusage.clear()

If needed this function can be used to clear the event loop. Indeed, we're registering an interval to free up the in-memory metrics. By calling this, it will clear this interval and all delete all in-memory data.

Related

• pidusage-tree - Compute a pidusage tree

Authors

• Antoine Bluchet - soyuka
• Simone Primarosa - simonepri

See also the list of contributors who participated in this project.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Changelog

2.0.17

• allow to manually clear the event loop when needed it'll clear itself after a given timeout (default to 60000ms but you can specify it with the maxage option, see this file) 1740a4f
• fix elapsed and timestamp calculations on linux #80 e5e2b01