Convert the output of os.cpus() in Node.js to percentage

nodejs-cpu-percent.js

// According to the http://nodejs.org/docs/latest/api/os.html#os_os_cpus, times is
// an object containing the number of CPU ticks spent in: user, nice, sys, idle, and irq
// So you should just be able to sum the times and calculate the percentage, like below:

var cpus = os.cpus();

for(var i = 0, len = cpus.length; i < len; i++) {
    console.log("CPU %s:", i);
    var cpu = cpus[i], total = 0;

    for(var type in cpu.times) {
        total += cpu.times[type];
    }

    for(type in cpu.times) {
        console.log("\t", type, Math.round(100 * cpu.times[type] / total));
    }
}