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An analysis of the Rabbit R1 APK
Emerge Tools analysis of the Rabbit R1 APK.
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Dissecting the gzip format (2011)
In this article I describe the DEFLATE algorithm that GZIP implements and depends on. The DEFLATE algorithm uses a combination of LZ77, Huffman codes and run-length-encoding; this article describes each in detail by walking through an example and developing source code to implement the algorithm. My aim is to…
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PIDs: Creating Stable Control in Games
Using a game use-case to motivate and explain PIDs
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The LMAX Architecture (2011)
LMAX is a retail financial trading system that can handle that can 6 million orders per second on a single JVM thread. The business logic runs in-memory surrounded by disruptors using event sourcing.
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Emacs: Contextual Interfaces in Casual Calc
A compelling idea in the Transient UI package is the ability to craft interfaces where commands specific to a context can be discovered and used. Such contextual interfaces enable a user to...
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Space-filling curves, constructively
In 1890 Giuseppe Peano discovered a square-filling curve , and a year later David Hilbert published his variation . In those days people did not waste readers’ attention with dribble – Peano explained it all on 3 pages, and Hilbert on just 2 pages, with a picture!
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PyPy v7.3.16
PyPy v7.3.16: release of python 2.7, 3.9, and 3.10 The PyPy team is proud to release version 7.3.16 of PyPy. This release includes security fixes from upstream CPython, and bugfixes to the garbage col
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Lamport Clocks
Last weekend I wanted to get some inspiration to write some TLA+ spec and I got my hands back on the paper Time, Clocks, and the Ordering of Events...
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Don’t look down on print debugging
Print good, not bad!
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The Dual Nature of Events in Event-Driven Architecture
On Software Architecture, Programming Languages,…2024112 points63 commentsSoftware Engineering details
Given that events play such a central role in event-driven architecture, there’s an astonishing lack of agreement on what should be contained in an event. This may be rooted in the fact that, depending on your perspective, events fulfill different purposes.
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Deadcode: Finding unreachable functions in Go
deadcode is a new command to help identify functions that cannot be called.
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Python Modern Practices
Good development practices for modern Python
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Linux Text Manipulation
learning a lot about sed, awk and other commands by making a spotify statusbar widget
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Building a streaming SQL engine with Arrow and DataFusion
Arroyo 0.10 has an entirely new SQL engine built with Apache Arrow and DataFusion. It's much faster, smaller, and easier to run. Read on for why and how we're making this change.
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I added some optimizations to my compiler that turns Lisp into JavaScript
Smaller programs that do less work.
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Using Pandoc and Typst to Produce PDFs
UPDATE MARCH 2025: This post, and the template attached, were written for Typst v 0.11 – Typst has upgraded twice since then, and this template will not work with the newer versions of Typst. Please see the new post (Mar 26, 2025) at A New Typst Template for Pandoc
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Needle: A DFA Based Regex Library That Compiles to JVM ByteCode
Many years ago, Kragen complained about the implementation and performance of Java regexes , and suggested that an implementation that emitted JVM bytecode could perform better. It's been a minute, but I'm happy to report that complaining on the Internet has served its purpose.
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My PHP Problems
For the past months I’ve been keeping a list of things I encountered in PHP that I’ve found to be problematic, or in other words things that annoy me.
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Docs as code (2017)
author, Eric Holscher& the Write the Docs community,. Documentation as Code ( Docs as Code) refers to a philosophy that you should be writing documentation with the same tools as code: Issue Tr...
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gRPC: The Ugly Parts
The seedy underbelly of gRPC.
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How does Sidekiq really work?
An investigation into the internals of Sidekiq, one of the most popular Ruby background job processors.
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Recording and visualising the 20k system calls it takes to "import seaborn"
Last time we counted CPU instructions, let’s look at syscalls now!
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DuckDB Isn't Just Fast
A whistlestop tour of the cool bits of DuckDB
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Goja: A Golang JavaScript Runtime
The personal website of JT Archie. Includes a blog, work ethic, and projects they have worked on.
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Decoding UTF8 with parallel extract
As a side-quest I recently decided to write a branchless utf8 decoder utilizing the pext or "parallel extract" instruction. It's compliant with rfc-3629 , meaning that it doesn't just naively decode the code-point but also checks for overlong encoding, surrogate pairs and such. Compiled with gcc -O3 -march=x86-64-v3…
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Postgres 17: Streaming I/O for sequential scans and ANALYZE
We discuss streaming and vectored I/O in Postgres 17. This is an important step towards implementing asynchronous I/O in Postgres. In Postgres 17 we do not yet have asynchronous I/O, but we do see a performance benefit from what is essentially a refactoring work around the internal APIs.