Comprehensive Guide to Node.js Performance Monitoring 🚀📊

Mastering Metrics and Optimization for High-Performance Applications 🔬🔧

1. CPU Metrics 💻

CPU Usage 📈

CPU usage reflects how busy the CPU is during a given time period.

const os = require('os');

function getCpuUsage() {
  return new Promise((resolve) => {
    const startMeasurement = os.cpus().map((cpu) => cpu.times);
    setTimeout(() => {
      const endMeasurement = os.cpus().map((cpu) => cpu.times);
      const cpuUsage = endMeasurement.map((end, i) => {
        const start = startMeasurement[i];
        const idle = end.idle - start.idle;
        const total = Object.keys(end).reduce((acc, key) => acc + (end[key] - start[key]), 0);
        return {
          core: i,
          usage: (1 - idle / total) * 100
        };
      });
      resolve(cpuUsage);
    }, 1000);
  });
}
getCpuUsage().then(console.log);

CPU Load 🏋️‍♂️

CPU load describes the number of tasks waiting for CPU execution.

const os = require('os');

function getCpuLoad() {
  const load = os.loadavg();
  console.log(`CPU Load (1 minute average): ${load[0]}`);
  console.log(`CPU Load (5 minute average): ${load[1]}`);
  console.log(`CPU Load (15…