Bun and Deno Bench (Ubuntu 24.04, AMD Ryzen™ 9 7900X × 24, 64GB RAM)

bun-parallel-server.ts

// will be called via bun-parallel-setup.ts

let i = 0;

Bun.serve({
  port: process.env.PORT || 8000,
  development: false,

  // Share the same port across multiple processes
  // This is the important part!
  reusePort: true,

  async fetch(request): Promise<Response> {
    return new Response(`Hello World ${i++}`);
  },
});

bun-parallel-setup.ts

// bun bun-parallel-setup.ts
// oha -c 10 -n 10000000 --disable-compression http://localhost:8000

/**
Success rate: 100.00%
Total:        30.6906 secs
Slowest:      0.0015 secs
Fastest:      0.0000 secs
Average:      0.0000 secs
Requests/sec: 325833.0318
*/

import { spawn } from "bun";

const cpus = navigator.hardwareConcurrency; // Number of CPU cores
const buns = new Array(cpus);

for (let i = 0; i < cpus; i++) {
  buns[i] = spawn({
    cmd: ["bun", "bun-parallel-server.ts"],
    stdout: "inherit",
    stderr: "inherit",
    stdin: "inherit",
  });
}

function kill() {
  for (const bun of buns) {
    bun.kill();
  }
}

process.on("SIGINT", kill);
process.on("exit", kill);

bun.ts

// bun bun.ts
// oha -c 10 -n 10000000 --disable-compression http://localhost:8000

/**
Success rate: 100.00%
Total:        67.4036 secs
Slowest:      0.0571 secs
Fastest:      0.0000 secs
Average:      0.0001 secs
Requests/sec: 148359.9817
*/

let i = 0;

Bun.serve({
  port: 8000,
  async fetch(request): Promise<Response> {
    return new Response(`Hello World ${i++}`);
  },
});

deno-parallel.ts

// deno serve --allow-net --parallel ./index.ts
// oha -c 10 -n 10000000 --disable-compression http://localhost:8000

/**
Success rate: 100.00%
Total:        35.3663 secs
Slowest:      0.0035 secs
Fastest:      0.0000 secs
Average:      0.0000 secs
Requests/sec: 282754.6559
*/

let i = 0;

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

deno.ts

// deno serve --allow-net ./index.ts
// oha -c 10 -n 10000000 --disable-compression http://localhost:8000

/**
Success rate: 100.00%
Total:        84.2660 secs
Slowest:      0.0616 secs
Fastest:      0.0000 secs
Average:      0.0001 secs
Requests/sec: 118671.7597
*/

let i = 0;

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