https://github.com/nairihar/ijs-conf-2023-munich
Slides and examples from my conference talk.
https://github.com/nairihar/ijs-conf-2023-munich
Last synced: 3 months ago
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Slides and examples from my conference talk.
- Host: GitHub
- URL: https://github.com/nairihar/ijs-conf-2023-munich
- Owner: nairihar
- License: gpl-3.0
- Created: 2023-10-07T13:31:19.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2023-10-31T12:06:31.000Z (over 1 year ago)
- Last Synced: 2025-02-05T01:52:27.989Z (5 months ago)
- Language: JavaScript
- Size: 52.5 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# `iJS Conference 2023 | Munich`
Topic: **Multithreading w/ Node.JS**
Date: Tuesday, October 24 2023 | 16:45 - 17:45
[The link to my talk is on javascript-conference.com.](https://javascript-conference.com/node-js/multithreading-node-js/)
---
## Slide
[**Go to the slide**](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/Slide.pdf)
## Examples
[**1) Basic**](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/1_basic)
```bash
cd 1_basic && node main.js
```
[**2) Communication**](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/2_communication)
```bash
cd 2_communication && node main.js
```
[**3) Workers communication**](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/3_worker_communication)
```bash
cd 3_worker_communication && node main.js
```
[**4) Shared state**](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/4_shared_state)
```bash
cd 4_shared_state && node main.js
```
## Special examples
I've built two open-source libraries that provide abstraction for `worker_threads`.
## [funthreads](https://github.com/nairihar/funthreads/)
[*Example 5*](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/5_callback_thread)
A simple library that provides an abstraction for the Node.js worker_threads module. You can run your function in a dedicated thread by working with Promises.
```bash
npm i funthreads
cd 5_callback_thread && node main.js
```
*JavaScript code*
```js
const { executeInThread } = require('funthreads');
async function calculate() {
const values = await Promise.all([
executeInThread(() => 2 ** 10), // this doesn't block the main thread
executeInThread(() => 3 ** 10)
]);
console.log(values); // 1024, 59049
}
calculate();
```
## [worker_map](https://github.com/nairihar/worker_map/)
[*Example 6*](https://github.com/nairihar/ijs-conf-2023-munich/tree/main/6_worker_shared_map)
A simple abstraction for Node.js worker_threads, allowing you to create and share a Map (hash table) between worker threads and the main process. This simplifies the process of managing shared data and communication between worker threads.
```bash
npm i worker_map
cd 6_worker_shared_map && node main.js
```
*JavaScript code*
First, let's create a simple hash map structure in main process, then create a worker thread and share the hash.
```js
// main.js
const { Worker } = require('worker_threads');
const { WorkerMap } = require('worker_map');
const map = new WorkerMap();
map.set('balance', 100); // sync operation
new Worker('./worker.js', {
workerData: {
mapBuffer: map.toSharedBuffer(),
},
});
setTimeout(() => {
console.log(map.get('balance')); // 200
}, 50);
```
Now, let's access the shared hash map structure in the worker thread.
```js
// worker.js
const { WorkerMap } = require('worker_map');
const { workerData } = require('worker_threads');
const map = new WorkerMap(workerData.mapBuffer);
console.log(map.get('balance')); // 100
// The change will be reflected in the main process as well
map.set('balance', 200);
```
---
Sincerely,
Nairi Harutyunyan
[**Medium**](https://nairihar.medium.com/) | [**Linkedin**](https://linkedin.com/in/nairihar) | [**@javascript newsletter in Telegram**](https://t.me/javascript)