Computer users organize their files into folders because that is the primary tool offered by operating systems. But applying this standard hierarchical model to my own files, I began to notice shortcomings of this paradigm over the years. At the same time, I used some other information systems not based on…
Scala, first appearing in 2004, is neither an old stalwart nor a new player in the programming language market. This post will discuss the unique combination of features that Scala provides and how it compares to other languages on the market, diving beneath the superficial experience to explore the fundamentals of…
On your Python learning journey, you may have heard that a great way to get better is to read code written by other people. That's true, but finding good code to study is not easy, mostly because the design philosophy and the reasoning behind the code are rarely documented. The Python standard library is special in…
I’ve been hearing about io_uring on and off for the last couple of years. Its a relatively new technology in Linux to allow high-performance IO with very few overheads. Whenever its been mentioned, its usually been presented as a new alternative to select, poll and epoll. This led me to believe that it was just the…
This post is about minimizing amount of disk IO and CPU overhead when reading Zip files. I recently saw an article about a new format that was faster than zip. This is quite surprising as to my mind, zip is one of the most flexible and low-overhead formats I’ve encountered. Some googling showed me that over past 11…
Flash cartridges (= "carts") are commonly used to run Game Boy ROMs, such as homebrew games or dumped officially released games, on real hardware. Different kinds of flash carts with various features and performance characteristics have been available for a long time, but flash carts have in general the reputation of…
Back in college, I was very interested in Java bytecode. When I got an internship at Google in 2013, I was skeptical of the security of the Java version of Google App Engine and got permission to spend the last week of my internship doing a mini red team exercise, trying to break into App Engine. This is the story of…
A look back and forward on PHP
libdivide is fish ’s library for speeding up integer division by runtime constants. It works by replacing divide instructions with cheaper multiplications and shifts.
5 bash tricks I find myself using often that I wish I'd discovered sooner.
Personal webpage of Fabian Mentzer.
How X Window Managers Work, And How To Write One (Part I)
Intro The goal of this tutorial is to describe Python development ecosystem. It can be helpful for someone coming to Python from another programming language. They say that you should stick to algorithms and data structures, that you can learn a new language in just a couple of weeks, that it’s just a new syntax. I…
Programmers often need to 'filter out' data. Suppose that you are given a database of users where only a small percentage are 'paying customers' (say 5% or less). You can write an SQL query to check whether a given user is indeed a paying customer, but it might require a round trip to your database … Continue reading…
The usual build-versus-buy rules for applications don't apply to integration
A while ago, I’ve been working on a very large codebase that consisted of a few million lines of code. Large systems are usually a big mess and this one was no exception. Since this is a rather common problem in software engineering, I thought the internet would be littered with stories about this topic. There is a…
A critical but informative look at the new structural pattern matching feature in Python 3.10, with real-world code examples.
Half a year ago, I joined Pleo, a FinTech startup with around 15,000 customers (we’re always hiring at Pleo!). I joined to take on and further develop the billing infrastructure. When I joined, I was actually a bit concerned about the narrowness of the new role and the new team. I mean, really… How much […]
When early stage programmers get stuck, they can get frustrated. Here's how to make the most of it.
redux adjective brought back; resurgent: the Victorian era redux.
