simple way to lookup linux process usage

  • usage

Downloads in past


391280.7.19 years ago11 years agoMinified + gzip package size for usage in KB


node-usage Build Status

process usage lookup with nodejs

  • Simple interface to lookup cpu and memory usage of any accessible process on the system.
  • Works on OSX, Linux, SmartOS and Solaris
  • Tested on Heroku, Nodejitsu and Modulus



~js var usage = require('usage');
var pid = // you can use any valid PID instead usage.lookup(pid, function(err, result) {

Result Object

~js {
memory: 100065280, // in no of bytes
memoryInfo: {
	rss: 15966208, // resident size memory in bytes
	vsize: 3127906304 // virtual memory size in bytes
cpu: 10.6 // in percentage

Average CPU usage vs Current CPU usage

>This is only applicable for Linux
By default CPU Percentage provided is an average from the starting time of the process. It does not correctly reflect the current CPU usage. (this is also a problem with linux ps utility)
But If you call usage.lookup() continuously for a given pid, you can turn on keepHistory flag and you'll get the CPU usage since last time you track the usage. This reflects the current CPU usage.
see following example to enable keepHistory flag
~js var pid =; var options = { keepHistory: true } usage.lookup(pid, options, function(err, result) {
you can clear history cache too ~js usage.clearHistory(pid); //clear history for the given pid usage.clearHistory(); //clean history for all pids ~