Deno 2

Finally something that comes close to Dart tools, or it reminds me a lot of it.

Does "deno install" behave like pnpm with the way it handles node_modules efficiently?

Also, is there any summary of the Deno 2 presentation? 1 hour is a bit too much to take in. It's almost like a movie.

The site presents Deno 2 as if it has finally beat Bun in terms of performance, is that the case? Either case, I downloaded Deno 2 from asdf and I'll give it a try, looks exciting!

> 1 hour is a bit too much to take in. It's almost like a movie

It's more like 20 mins.

There's a general intro of like 10 mins on Deno and then like 30 mins of a livestream with the Deno team.

> The site presents Deno 2 as if it has finally beat Bun in terms of performance

Bun's HTTP server performs 51% faster before parallelism. Their benchmark is incorrect. They posted a correction, and their correction is also incorrect. Benchmarking correctly is hard, and we put a lot of effort into making sure our benchmarks are easily reproducible.

Bun v1.1.30: 283,386 requests per second (51% faster)

Deno v2.0.0: 187,359 requests per second

Deno v1.45.5: 185,522 requests per second

The following code:

  let i = 0;

  export default {
    async fetch(request: Request): Promise {
      return new Response(`Hello, world! ${i++}`);
    },
  };

Run with:

    oha -c 10 -n 10000000 --disable-compression http://localhost:{port}

This was tested on a Linux x64 machine running Debian 11 with a 32 core Intel i9-13900 CPU and 64GB of RAM. In this benchmark, the HTTP server runs on a single thread, so the CPU core count is not as relevant but still worth mentioning.

If we increase the number of concurrent connections from 10 to 1,000 - Bun's HTTP server performs 267% faster.

Bun v1.1.30: 209,133 requests per second (267% faster)

Deno v2.0.0: 78,289 requests per second

Deno v1.45.5: 76,628 requests per second

Run with:

    oha -c 1000 -n 10000000 --disable-compression http://localhost:{port}

Note that we add the --disable-compression for Deno's benefit here (as it does nothing for Bun right now)

Have not yet spent enough time investigating their other benchmarks.

Just did it:

  $ brew update && brew install deno
  $ deno --version
  deno 2.0.0 (stable, release, aarch64-apple-darwin)
  v8 12.9.202.13-rusty
  typescript 5.6.2

I just tested it with ioredis node.js package for production use and Deno 2 could handle:

- Automatic connection pooling

- 400MB/s+ of throughput

- 20 000+ keys and larger values (10-50kb)

- 1000+ concurrent reads/writes

- 200-250MB of RAM usage max

Without breaking a sweat, the limitation was my keydb test server.