os-utils/lib/osutils.js

var _os = require('os');

exports.platform = function(){ 
	return process.platform;
}

exports.cpuCount = function(){ 
	return _os.cpus().length;
}

exports.sysUptime = function(){ 
	//seconds
	return _os.uptime();
}

exports.processUptime = function(){ 
	//seconds
	return process.uptime();
}



// Memory

exports.freemem = function(){
	return _os.freemem() / ( 1024 * 1024 );
}

exports.totalmem = function(){

	return _os.totalmem() / ( 1024 * 1024 );
}

exports.freememPercentage = function(){
	return _os.freemem() / _os.totalmem();
}

/*
* Returns the load average usage for 1, 5 or 15 minutes.
*/
exports.loadavg = function(_time){ 

	if(_time === undefined || (_time !== 5 && _time !== 15) ) _time = 1;
	
	var loads = _os.loadavg();
	var v = 0;
	if(_time == 1) v = loads[0];
	if(_time == 5) v = loads[1];
	if(_time == 15) v = loads[2];
		
	return v; 
}


exports.cpuFree = function(callback){ 
	getCPUUsage(callback, true);
}

exports.cpuUsage = function(callback){ 
	getCPUUsage(callback, false);
}

function getCPUUsage(callback, free){ 
	
	var stats1 = getCPUInfo();
	var startIdle = stats1.idle;
	var startTotal = stats1.total;
	
	setTimeout(function() {
	  	var stats2 = getCPUInfo();
		var endIdle = stats2.idle;
		var endTotal = stats2.total;
		
		var idle 	= endIdle - startIdle;
		var total 	= endTotal - startTotal;
		var perc	= idle / total;
	  	
	  	if(free === true)
	  		callback( perc );
	  	else
	  		callback( (1 - perc) );
	  		
	}, 1000 );
}

function getCPUInfo(callback){ 
	var cpus = _os.cpus();
	
	var user = 0;
	var nice = 0;
	var sys = 0;
	var idle = 0;
	var irq = 0;
	var total = 0;
	
	for(var cpu in cpus){
		
		user += cpus[cpu].times.user;
		nice += cpus[cpu].times.nice;
		sys += cpus[cpu].times.sys;
		irq += cpus[cpu].times.irq;
		idle += cpus[cpu].times.idle;
	}
	
	var total = user + nice + sys + idle + irq;
	
	return {'idle': idle, 'total': total};
}