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How do you build a worker-thread pool (e.g. Piscina) for CPU-bound work?

Q: How do you build a worker-thread pool (e.g. Piscina) for CPU-bound work?

**TL;DR.** Spawning a worker per task is expensive, so a **pool** keeps **N long-lived workers** and dispatches tasks to **idle** ones via a queue. Libraries like **Piscina** implement this; you submit a task and get a Promise back. It parallelizes CPU-bound work across cores while keeping the main event loop responsive. task queue submit() pool (reused) <text class='d-sub' x='216'

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Understand the problem

Reusing worker threads to parallelize heavy computation.

nodejsworker-threadsconcurrencypiscina

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Run CPU tasks through Piscina

import Piscina from 'piscina';

const pool = new Piscina({ filename: new URL('./worker.js', import.meta.url).href });

// Submit many tasks; the pool keeps ~core-count workers busy.
const results = await Promise.all(
  inputs.map((data) => pool.run(data))   // each returns a Promise
);

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