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Django 4.2 Released
Posted by Mariusz Felisiak on April 3, 2023
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A linear algebra trick for computing Fibonacci numbers fast
Fast Fibonacci Computations With a Linear Algebra Twist
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Going faster by duplicating code
This function doesn't know the value being multiplied until it is called. The compiler (gcc, O2) emits a generic integer multiply instruction in its loop body.
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Helix 23.10 Highlights
A post-modern modal text editor.
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Donkey code
This is an attempt to write down a very simple example I’ve been using to explain the profound impact the language we use has on thought, discussion and ultimately code. Imagine you have a co…
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Gamedev from Scratch 1: Scaffolding
Welcome to part 1 of this narrative series about writing a complete video game from scratch, using the PICO-8. This is actually the second part, because in this house (unlike Lua) we index from 0, so if you’re new here you may want to consult the introductory stuff and table of contents in part zero. If you’ve been…
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Understanding and coding the self-attention mechanism of large language models
Step-by-step tutorial explaining scaled dot-product self-attention for large language models, with Python code that builds the mechanism from scratch.
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Lean, Coq and other proof assistants: Visualising proofs as trees
This week we (me & Anton Kovsharov) published Paperproof, a Gentzen-tree-like proof interface for Lean 4. In this post I'll review proof visualisations from o...
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Don't write clean code, write CRISP code
“Clean code” is so over: all the cool kids are switching to CRISP code . I’ll show you how to achieve it in five catchy, T-shirt-friendly slogans.
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Phoenix 1.7 for Elixir: Edit a Form in a Modal
In the final part of our series, we'll implement an edit modal.
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Don't let event-driven architecture buzzwords fool you
I see a lot of new terms like Command-Event, Event-Based Compute, etc., presented around Event-Driven Architecture. Let me clear that up because there are no such things…
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Rust's Golden Rule
I find myself thinking about a particular design principle of Rust today. I’m not sure I’ve ever seen it named specifically before, but it gets referred to from…
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Unpacking Elixir: Real-Time and Latency
Elixir was built on Erlang. Erlang was built to provide "consistently low latency" and a few other audacious goals. Note, this is not a hard realtime constraint. It is soft, squishy and yet, important and real. It makes Erlang unusually suitable to systems where latency matters and where a near-realtime experience is…
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Using XPath in 2023
In the latest release of htmx , you can add event listeners to elements with hx-on :
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QOA, the Quite OK Audio Format
Audio formats typically fall into one of three categories: “lossless” , “complicated” or “bad” . After developing a simple image format last year, I tried to come up with an audio format that fits neither of these categories.
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How MOS 6502 illegal opcodes work
The original NMOS version of the MOS 6502, used in computers like the Commodore 64, the Apple II and the Nintendo Entertainment System (NES), is well-known for its illegal opcodes: Out of 256 possible opcodes, 151 are defined by the architecture, but many of the remaining 105 undefined opcodes do…
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Interoperability: Swift’s Super Power
Open sourcing our learnings around Windows APIs, COM, C++ and their delightful integration into Swift - while building Arc.
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Improving Emacs Isearch Usability with Transient
Emacs incremental search (isearch) has an embarrassingly rich feature set. That said, I rarely use isearch beyond its basics for the twofold reasons: There are many isearch commands that are...
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When URL parsers disagree
Discovery and walkthrough of CVE-2023-38633 in librsvg, when two URL parser implementations (Rust and Glib) disagree on file scheme parsing leading to path traversal.
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What happens when you open a terminal and enter `ls’
This article explores how terminal emulators function, decoding the process of sending commands to the shell for execution. Unveil the mystery behind what happens when you open a terminal and enter Is.
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How to scale LLMs better with an alternative to transformers
Monarch Mixer: Revisiting BERT, Without Attention or MLPs
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Writing a Profiler in 240 lines of pure Java
A few months back, I started writing a profiler from scratch, and the code since became the base of my profiler validation tools. The only problem with this project: I wanted to write a proper non-safepoint-biased profiler from scratch. This … Continue reading →
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Lensm, a tool for viewing disassembly
I couldn’t find a great tool for viewing disassembly, so I wrote it myself over the weekend.
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The day I started believing in unit tests
Right after getting my degree, I was lucky to be hired into a small but decent R&D department as an embedded software engineer. My first task was to create a Unit Test project and have it run in our build pipeline after compilation. I was not particularly excited about this task, it seemed like busywork to me. I…
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The shell and its crappy handling of whitespace
From the highly eclectic blog of Mark Dominus
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Clojure is a product design tool (2015)
Clojure makes me more efficient and extends my reach as a designer. And it protects me from complex design workflows...
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Kraken Technologies: How we organise our large Python monolith
By David Seddon from Kraken Technologies. Hi, I’m David, a Python developer at Kraken Technologies. I work on Kraken: a Python application which has, at last count, 27,637 modules. Yes, you read that right: nearly 28k separate Python files - not including tests. I do this along with 400