frn.sh

Hello! I’m Fernando Simões, a software engineer working on performance, reliability and infrastructure. I enjoy measuring things. This blog is about what I find interesting in computers - things I observed in production, a specific idea, algorithm or number.

Notes

12 Jun, 2026 The cost of a Postgres read
21 Mar, 2026 Where did 400 MiB go?
11 Dec, 2025 Investigating 108,725 forks
21 Oct, 2025 Breaking an executable file
08 Apr, 2025 Sigterm a D state process

Others

I’ve been curating a list of computer science papers, blog posts, and videos.

Hänsel und Gretel plaque at the Bosque Alemão (German Woods) in Curitiba

My son's custom Lego build — My son's custom Lego build: mad scientist and robot headed to outer space. Yes, the stairs are there just in case