Nairi Harutyunyan
Big fan of JavaScript
Parallel Universes | Node.js
Multithreading
Nairi Harutyunayn
@nairihar / contact me here!
Sr. Backend Engineer @ Screenful
Co-founder of Node.js Armenia 🖤
🖤 nodejsarmenia
💙 reactarmenia
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Stereotypes about JS/Node.jsÂ
Let's break them!
JavaScript
*simpler than you think
Manager            Â
<-> Workers
Do not occupy the manager!
Node.js
Thread Pool
File I/O
DNS
...
Blocking I/O
Thread Pool
UV_THREADPOOL_SIZE=8 (SIZE<=128)
Thread pool
Blocking I/O
CPU intensive
NOW: Up to 1024 threads (after libuv v1.30.0 or node v12.5.0)
Worker Threads
Main Thread <-> Thread communication
Thread <-> Thread communication
Shared*Â Buffers
Race condition
Atomics
@nairihar/funthreads
Special thanks to
Gagik Harutyunyan
Resources*
Please don't forget to read the rules!
Big thanks to those who support
the JS community ...
Thank You!
Thanks to organizer!
@nairihar
Special thanks to Varser!
Cluster | Child Process
fork(), spawn(), ...
const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;
if (cluster.isPrimary) {
for (let i = 0; i < numCPUs; i++) {
cluster.fork();
}
// ...
} else {
// Workers can share any TCP connection
http.createServer((req, res) => {
res.writeHead(200);
res.end('hello world\n');
}).listen(8000);
}// Main process -> main.js
const { Worker } = require('worker_threads');
const worker = new Worker('./worker.js');
worker.on('message', (msg) => {
console.log('Message', msg);
});
worker.on('error', console.error);
worker.on('exit', (code) => {
console.log('Exit', code);
});
// Thread -> worker.js
const { parentPort } = require("worker_threads");
parentPort.postMessage('Greetings from thread!');
$ node script.js
Message Greetings from thread!
Exit 0Parallel Universes | Node.js
By Nairi Harutyunyan
