This command creates an isolate-0xnnnnnnnnn-v8.log (where n is a digit) log file, and it should look like this: Run this command on your terminal: node -prof controllers/bookController.js So you can go ahead and create as much data in the database as you can. We are adding some data to help us simulate a scenario where users have latency issues when making requests to your app. Let’s examine the handler functions in controllers/bookController.js and profile them: //controllers/bookController.jsĮxports.getAllBooks = async (req, reply) => ) To follow along, you can clone the GitHub repo. The Fastify API performs CRUD operations for a bookstore app. Fastify claims to be the “fastest web framework in town!” so I felt using this would be perfect for a demo. This example uses the Node.js framework Fastify. Let’s illustrate how this works with a sample Node.js app. Node.js implements this by introducing the -prof flag, which communicates with the V8 profiler and then logs the data. The easiest way in Node.js to profile applications is by using the inbuilt profiler, which collects all the data from functions and logs it into a file. Let me help you do this programmatically.” The Node.js profiler So in essence, a profiler tells you, “Hey, don’t stress in guessing where the bug that slows down your application is hiding. Some of these bottlenecks might be obvious but most of them not so much. Bottlenecks happen when a line/block of code or function is not performing as well as the rest of the program. The purpose here is to identify bottlenecks in your code. Profiling is collecting and analyzing data on how functions in your code perform when executed, regarding performance measurement parameters such as time complexity, throughput, input workloads, garbage collection, and time to invoke and execute a function. In this article, you’ll learn about the inbuilt profiling tool recommended in Node.js. N.B., CPU profiling and CPU monitoring are often used interchangeably but are different. The main issue now stems from acquiring the best profiler tool that measures your Node.js application performance based on these metrics and doesn’t affect the software responsiveness. Furthermore, on performance, it is common practice to follow key performance metrics such as average response time, traffic rate, and CPU usage of your application and the server. Starting as a software developer, it’s recommended to follow a more pragmatic approach to developing software.Īs time goes on, when you start building more complex software that serves thousands or millions of users, it becomes crucial to be more concerned with concepts such as architecture, system design, testing, security, deployment, and most especially performance. I enjoy teaching what I have learned and what I'm currently learning so that others can benefit from it. Chimezie Enyinnaya Follow I'm a self-taught software developer based in Lagos, Nigeria.
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