Node.js multi threads All In One

Node.js multi threads All In One

Node.js 多线程

Worker threads

工作线程

// const worker = require('node:worker_threads');

const {
  Worker, isMainThread, parentPort, workerData,
} = require('node:worker_threads');

if (isMainThread) {
  module.exports = function parseJSAsync(script) {
    return new Promise((resolve, reject) => {
      const worker = new Worker(__filename, {
        workerData: script,
      });
      worker.on('message', resolve);
      worker.on('error', reject);
      worker.on('exit', (code) => {
        if (code !== 0)
          reject(new Error(`Worker stopped with exit code ${code}`));
      });
    });
  };
} else {
  const { parse } = require('some-js-parsing-library');
  const script = workerData;
  parentPort.postMessage(parse(script));
}

https://nodejs.org/api/worker_threads.html

child_process

子进程

const { spawn } = require('node:child_process');
const ls = spawn('ls', ['-lh', '/usr']);

ls.stdout.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

ls.stderr.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

ls.on('close', (code) => {
  console.log(`child process exited with code ${code}`);
});

https://nodejs.org/api/child_process.html

Cluster

集群

import cluster from 'node:cluster';
import http from 'node:http';
import { availableParallelism } from 'node:os';
import process from 'node:process';

const numCPUs = availableParallelism();

if (cluster.isPrimary) {
  console.log(`Primary ${process.pid} is running`);

  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`);
  });
} else {
  // Workers can share any TCP connection
  // In this case it is an HTTP server
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('hello world\n');
  }).listen(8000);

  console.log(`Worker ${process.pid} started`);
}

https://nodejs.org/api/cluster.html

demos

tools

PM2

node:module API

// module.mjs
// In an ECMAScript module
import { builtinModules as builtin } from 'node:module';

// module.cjs
// In a CommonJS module
const builtin = require('node:module').builtinModules;

https://nodejs.org/api/module.html

echo 'console.log(`Hello, ${process.argv[2]}!`);' > hello.js

echo '{ "main": "hello.js", "output": "sea-prep.blob" }' > sea-config.json

https://nodejs.org/api/single-executable-applications.html

refs

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