Análisis del event loop en aplicaciones Node.js usando Nsolid

Mastering performance analysis in Node.js applications is key to optimizing applications and ensuring a good user experience. Using the N Solid tool, you can easily identify event loop crashes, measure performance and evaluate your application's essential metrics. Learn how to use the Express framework, run performance tests with Autocannon and use deadlock avoidance techniques using functions such as setImmediate.

What is Nsolid and how does it help analyze Node.js metrics?

Nsolid is a free, open source tool that allows you to analyze Node.js processes using detailed performance metrics. This service offers observability for up to four concurrent processes. To start using it:

• Access the accounts.nodesource.com page.
• Log in with a Google, GitHub or other email account.
• Use the N Solid SAS token to connect your process to the observability platform.

This platform clearly displays key metrics such as CPU usage, Event Loop status and Heap memory used.

How to test the Event Loop lock?

To examine and understand these locks, create a simple application with Express that handles two types of endpoints:

Simple endpoint (non-blocking, fast):

• Responds fast without executing heavy tasks.

Blocking endpoint:

• Processes a large file synchronously causing blocking.

Running both endpoints allows to clearly observe, using tools such as Autocannon, the difference in performance caused by Event Loop blocking.

How to reduce Event Loop deadlocks with setImmediate?

Break a large process into small tasks using setImmediate. This technique allows a heavy task to run in small portions that do not completely block the Event Loop. For example, set your heavy task as follows:

const processChunks = () => { const end = Math.min(index + chunkSize, largeFile.length); while(index < end) { results.push(largeFile[index]); index++; } if(index < largeFile.length){ setImmediate(processChunks); } else { res.send(`${results.length} items processed`);} };processChunks();

What are the benefits of avoiding deadlocks in the Event Loop?

Avoiding Event Loop saturation allows more simultaneous requests to be handled efficiently. When running tests with Autocannon, a large performance improvement is demonstrated for fast endpoints when blocking tasks are reduced. This ensures your users a better experience and guarantees a more optimal use of computational resources.

Have you already performed performance analysis on your Node.js projects? Share your experience or doubts in the comments.