Andrew Johnston billywhizz

kevent with timeout = 0
rate 80986.22 nanos_op 12347
rate 81772.37 nanos_op 12229
rate 81650.72 nanos_op 12247
rate 81608.60 nanos_op 12253
rate 81304.12 nanos_op 12299
kevent64 with timeout = 0 and flags = 0
rate 81713.43 nanos_op 12237
rate 81648.45 nanos_op 12247

issue summary

setImmediate in node.js has a lot of overhead on macos compared to linux. attention was drawn to this in this tweet from jarred sumner.
in the referenced benchmark, node on macos was only able to achieve 80k ticks per second of the event loop versus millions per second for Bun & Deno on macos
on linux, difference between node, Bun and Deno are much less significant
the change implemented in Bun for MacOS uses the KEVENT_FLAG_IMMEDIATE flag to create a fast return from the syscall when there is no pending io.
the flag in question is only available when using the kevent64 syscall on macos
libuv uses the kevent syscall, which is common across bsd based platforms.
i built a version of node with [patches](https://github.com

https://github.com/microsoft/litebox https://hy.tencent.com/research/100025?langVersion=en https://crawshaw.io/blog/eight-more-months-of-agents https://mitchellh.com/writing/my-ai-adoption-journey https://red.anthropic.com/2026/zero-days/ https://www.luiscardoso.dev/blog/sandboxes-for-ai

Configuring a development environment for Bun can take 10-30 minutes depending on your internet connection and computer speed. You will need ~10GB of free disk space for the repository and build artifacts.

If you are using Windows, please refer to this guide

Using Nix (Alternative)

A Nix flake is provided as an alternative to manual dependency installation:

nix develop

{
  type: "log",
  args: [
    {
      type: "string",
      value: "something interesting"
    }
  ],
  executionContextId: 1,

hi, i'm daniel. i'm a 16-year-old high school senior. in my free time, i hack billion dollar companies and build cool stuff.

about a month ago, a couple of friends and I found serious critical vulnerabilities on Mintlify, an AI documentation platform used by some of the top companies in the world.

i found a critical cross-site scripting vulnerability that, if abused, would let an attacker to inject malicious scripts into the documentation of numerous companies and steal credentials from users with a single link open.

(go read my friends' writeups (after this one))
how to hack discord, vercel, and more with one easy trick (eva)
Redacted by Counsel: A supply chain postmortem (MDL)

	function getDatabase (name = 'ConversationsDatabase') {
	const req = window.indexedDB.open(name)
	return new Promise((resolve, reject) => {
	req.onsuccess = e => resolve(req.result)
	req.onerror = req.onabort = reject
	})
	}

	function getAllKeys (db, collection = 'conversations') {
	const req = db.transaction([collection], 'readonly').objectStore(collection).getAllKeys()

	"""
	The most atomic way to train and inference a GPT in pure, dependency-free Python.
	This file is the complete algorithm.
	Everything else is just efficiency.

	@karpathy
	"""

	import os # os.path.exists
	import math # math.log, math.exp

	import { api } from 'lib/sqlite/api.js'
	import { bindall, bind_custom } from 'lib/ffi.js'
	import { Bench } from 'lib/bench.js'

	const { assert, core, ptr, utf8_length } = lo
	const { dlopen, RTLD_NOW, RTLD_LOCAL } = core
	const sqlite_handle = assert(dlopen(lo.getenv('SQLITE_SO') \|\| 'libsqlite3.so', RTLD_NOW \| RTLD_LOCAL))
	const sqlite = bindall(api, sqlite_handle)

	const u32 = ptr(new Uint32Array(2))

	FROM scratch
	ADD sea /sea
	CMD ["/sea"]