Worth reading on hayden.dev

Saving another 100TB of RAM with math (and Rust)

Sat, 19 Sep 2026 06:06:45 -0400

Great example of using probability to trade exactness for huge memory wins.

Cloudflare's global network is immense but not limitless. As we look for small ways to trim our resource usage, we sometimes get lucky and we can cut significantly more. Here's how we reduced one of our Pingora-based service's RAM usage with statistics.

Redis City — inside one Redis

Tue, 15 Sep 2026 16:57:49 -0400

An interactive 3D Redis visualization, from command parsing and key lookup to the allocator, memory pages, RDB, and AOF.

How we saved 100 terabytes of memory by optimizing 1.1.1.1’s DNS cache

Fri, 28 Aug 2026 07:14:26 -0400

Five Rust-level memory optimizations to the DNS cache layout of Big Pineapple cut per-entry memory by 56%, freeing approximately 100 TB of memory across Cloudflare's fleet.

Git at any scale

Tue, 18 Aug 2026 21:56:47 -0400

Probably one of the most interesting posts I’ve read in a while. Written by someone who worked at GitHub for 10 years, it covers how GitHub works and how they’re using S3 to build Origin.

tl;dv (Too Lazy; Didn't Validate): 181,874 Meetings Left Wide Open

Thu, 06 Aug 2026 13:13:06 -0400

How a missing Firestore security rule on tl;dv exposed 181,874 meetings from 84,312 users across 35,003 domains, including live calls I could join uninvited, and how six months of disclosure got me nothing but seen receipts.

We're building Postgres in Rust. Using the LLVM of databases

Fri, 17 Jul 2026 11:21:32 -0400

Turso is becoming the LLVM of databases: one modern, reliable Rust core with many SQL frontends. After rewriting SQLite, we are now building Postgres.

Making 768 servers look like 1

Wed, 15 Jul 2026 15:19:44 -0400

How to make 768 distinct Postgres servers look like 1 to your applications.

Rewriting Bun in Rust

Wed, 08 Jul 2026 18:54:12 -0400

Why & how we rewrote Bun from Zig to Rust

British Columbia, Time Zones, and Postgres

Mon, 22 Jun 2026 21:27:08 -0400

This year, British Column has moved to year-round Pacific Time. How does that affect date data?

DeepSWE

Wed, 27 May 2026 15:09:45 -0400

DeepSWE measures frontier coding agents on original, long-horizon software engineering tasks.

Train Your Judgement

Tue, 19 May 2026 09:49:56 -0400

Settling for good enough is not good enough.

Porting Mac OS X to the Nintendo Wii

Thu, 09 Apr 2026 08:05:48 -0400

Mac OS X 10.0 (Cheetah) running natively on the Nintendo Wii

We Built a Video Rendering Engine by Lying to the Browser About What Time It Is

Tue, 03 Mar 2026 07:23:06 -0500

How Replit turns any web page into a deterministic video by virtualizing time itself, patching key browser audio APIs, and waging war against headless Chrome's quirks.

Game Boy Advance Audio Interpolation

Mon, 09 Feb 2026 21:51:02 -0500

An audio enhancement a Game Boy Advance emulator can implement to reduce aliasing and noise, by replacing the hardware's nearest-neighbor resampling with better interpolation.

Scaling PostgreSQL to power 800 million ChatGPT users

Fri, 23 Jan 2026 07:41:24 -0500

An inside look at how OpenAI scaled PostgreSQL to millions of queries per second using replicas, caching, rate limiting, and workload isolation.

I decided to make a worse UUID for the pettiest of reasons.

Tue, 20 Jan 2026 09:19:59 -0500

My Home Fibre Network Disintegrated, Literally

Sun, 11 Jan 2026 09:24:27 -0500

Thanks HN folks for all the comments. To clarify a bit, the cables are pulled through PVC conduits under the flooring before being buried in cement. Currently the hypothesis for why the cable disintegrated so quickly is hydrolysis. Singapore is extremely humid after all. A second possibility is that I keep the leftover wall paints (Nippon Paint Vinilex 5000) in the same room and have noticed that…

Google Antigravity Exfiltrates Data

Tue, 25 Nov 2025 18:36:44 -0500

An indirect prompt injection in an implementation blog can manipulate Antigravity to invoke a malicious browser subagent in order to steal credentials and sensitive code from a user’s IDE.

Making Postgres 42,000x slower because I am unemployed

Tue, 29 Jul 2025 09:41:03 -0400

As an respectable unemployed person must do, I tried to make Postgres as slow as possible

Postgres to ClickHouse: Data Modeling Tips V2

Thu, 24 Jul 2025 23:22:05 -0400

Covers a bit of how ClickHouse’s MergeTree engine works.

Dive into how Postgres-to-ClickHouse replication works, and learn best practices for data deduplication, custom ordering keys, optimizing JOINs, denormalization, and more.

Covert Web-to-App Tracking via Localhost on Android

Wed, 11 Jun 2025 21:51:20 -0400

Meta’s Facebook and Instagram apps opened a port on the device (localhost), and websites with the Meta tracking pixel would quietly send telemetry to it. That let them track people even in incognito sessions, across roughly 17,000 US sites.

This blog is hosted on a Nintendo Wii

Mon, 21 Apr 2025 20:15:03 -0400

MySQL At Uber

Wed, 12 Feb 2025 19:45:08 -0500

At Uber, our MySQL® fleet is the backbone of our data infrastructure, supporting a vast array of operations critical to our platform. Uber operates an extensive MySQL fleet, consisting of over 2,300 independent clusters. Building a control plane to manage this fleet at such a massive scale, while ensuring zero downtime and no data loss, is among the most challenging problems in the industry.

Collection of insane and fun facts about SQLite

Mon, 30 Dec 2024 21:11:40 -0500

Some of the interesting and insane facts I learned about SQLite

After 3 Years, I Failed. Here's All My Startup's Code.

Tue, 17 Dec 2024 08:21:07 -0500

And by "all," I mean everything: core product, failed pivots, miscellaneous