Node.js · Theory

Difference between Event loop and thread pool in Node.js

Theory

403/723

Difference between Event loop and thread pool in Node.js

Difference between Event loop and thread pool (in node js) is a Node.js topic. In plain words you use it for wait for DB then reply in one Node process. Don’t start with a slogan — start with that picture.

Smallest example: async I/O, don’t block. Type it, run it, and say what you see. If you can do that from memory, you know Difference between Event loop and thread pool (in node js).

From the example next to this theory — Difference between Event loop and thread pool in Node.

Trap — fs.readFileSync on a huge file. Fix that before you talk about advanced Node.js.

Viva: what is Difference between Event loop and thread pool (in node js)? Then show async I/O, don’t block. Then name the trap.

Diagram

  request
      │
      ▼
  event loop
      │ I/O done
      ▼
  response

Exam tip

What is Difference between Event loop and thread pool (in node js)? Show this: async I/O, don’t block. Trap: fs.readFileSync on a huge file.

Example

const EventEmitter = require("events");
const bus = new EventEmitter();

bus.on("ping", (n) => console.log("pong", n));
bus.emit("ping", 1);
bus.emit("ping", 2);

Difference between Event loop and thread pool in Node.js — eventEmitter is the pub/sub core used across Node APIs.

Short notes

DefDifference between Event loop and thread pool (in node js) — wait for DB then reply in one Node process.
Ruleasync I/O, don’t block
Trapfs.readFileSync on a huge file
Useone Node process

Node.js · Theory

Difference between Event loop and thread pool in Node.js

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Theory

403/723

Difference between Event loop and thread pool in Node.js

Smallest example: async I/O, don’t block. Type it, run it, and say what you see. If you can do that from memory, you know Difference between Event loop and thread pool (in node js).

From the example next to this theory — Difference between Event loop and thread pool in Node.

Trap — fs.readFileSync on a huge file. Fix that before you talk about advanced Node.js.

Viva: what is Difference between Event loop and thread pool (in node js)? Then show async I/O, don’t block. Then name the trap.

Diagram

  request
      │
      ▼
  event loop
      │ I/O done
      ▼
  response

Exam tip

What is Difference between Event loop and thread pool (in node js)? Show this: async I/O, don’t block. Trap: fs.readFileSync on a huge file.

Example

const EventEmitter = require("events");
const bus = new EventEmitter();

bus.on("ping", (n) => console.log("pong", n));
bus.emit("ping", 1);
bus.emit("ping", 2);

Difference between Event loop and thread pool in Node.js — eventEmitter is the pub/sub core used across Node APIs.

Short notes

DefDifference between Event loop and thread pool (in node js) — wait for DB then reply in one Node process.
Ruleasync I/O, don’t block
Trapfs.readFileSync on a huge file
Useone Node process

Difference between Event loop and thread pool in Node.js

Example

Short notes

Questions

Difference between Event loop and thread pool in Node.js

Example

Short notes

Questions