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Common shell script mistakes (2008)
Portability and Robustness issues commonly found in shell scripts
Most cited
Posts that commenters keep linking to, ranked by how many different people have cited them in Hacker News comments. 3,470 posts.
2372
How misaligning data can increase performance 12x by reducing cache misses
Here's the graph of a toy benchmark 1 of page-aligned vs. mis-aligned accesses; it shows a ratio of performance between the two at different working set sizes. If this benchmark seems contrived, it actually comes from a real world example of the disastrous performance implications of using nice power of 2 alignment…
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Global Interpreter Lock, or how to kill it
People that listened to my (Armin Rigo) lightning talk at EuroPython know that suddenly, we have a plan to remove the Global Interpreter Loc...
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Forgejo
After many days of hard work and preparation by a team of former Gitea maintainers and enthusiasts from the FOSS community, we are proud to announce that the Forgejo project is now live.
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Uv 0.3 – Unified Python packaging
Manage entire Python projects and even Python itself with a single unified tool.
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Levels of code in Forth programming (2002)
I had been programming in Fortran and assembler for a number of years when I got my first personal computer. It was exciting. On the first generation PC one had to toggle in a paper tape loader from front panel switches, byte by byte, then start the paper tape reader and then one could output to the led on the front…
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WebAssembly doesn’t make unsafe languages safe
WebAssembly is all the rage these days. And for good reasons. It’s pretty exciting to see many compiled languages adopting a common intermediate represe...
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Optimizing a ring buffer for throughput (2021)
In this article I will take a look at the classic concurrent ring buffer and how it can be optimized to increase throughput.
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Visualizing binaries with space-filling curves
Edit: Since this post, I've created an interactive tool for binary visualisation - see it at binvis.io
2381
Making Sandspiel
Sandspiel is a falling sand game I built in late 2018. I really enjoyed writing this game, and wanted to put into writing some of my goals, design decisions, and learnings from that process. If you’re reading this but haven’t played sandspiel, you should probably go try it !
2382
Building Photoshop 1.0
On February 13, 2013, the Computer History Museum reported that they had received the source code for version 1.1 of Photoshop from Adobe, and had permission to release it for non-commercial use. This is the second time recently that something like this has happened, the first being the release of the Quickdraw and…
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Paving the on-ramp to Java
Java is one of the most widely taught programming languages in the world. Tens of thousands of educators find that the imperative core of the language combined with a straightforward standard library is a foundation that students can comfortably learn on. Choosing Java gives educators many degrees of freedom: they can…
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Announcing Pyston: an upcoming, JIT-based Python implementation
Dash knows your context, your team, and your work, so your team can stay organized, easily find and share knowledge, and keep projects secure, all from one place.
2385
Kotlin/Native Tech Preview: Kotlin without a VM
We are happy to announce the first Technology Preview of Kotlin/Native that compiles Kotlin directly to machine code. The Kotlin/Native compiler produces standalone executables that can run without an
2386
McCarthy's Ambiguous Operator (2005)
Random code snippets, projects and musings about software from Eric Kidd, a developer and occasional entrepreneur.
2387
Emacs: Mastering Eshell
Emacs has a shell written entirely in Emacs Lisp. Here's how you master Eshell, a versatile and powerful shell capable of supplanting bash or zsh as your daily driver.
2388
A New RegExp Engine in SpiderMonkey
Regular expressions – commonly known as RegExps – are a powerful and heavily used tool for manipulating strings in JavaScript. This post describes how we updated the RegExp engine in ...
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Introduction to monads in JavaScript
I know, I know, the world does not need yet another introduction to monads (or yet another article complaining that world does not need yet another introduction to monads). So you’ll be glad to know this isn’t one of those, in the sense that it’s not new. I thought I’d write it because, first, monads are worth knowing…
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HipHop VM: now at 98.5% PHP framework parity, 16% faster
On November 4th, the HHVM team went on a 3-week performance and parity lockdown. The lockdown officially ended on November 22nd. Overall, this lockdown was a...
2392
A new approach to text rendering
We are archiving Atom and all projects under the Atom organization for an official sunset on December 15, 2022.
2393
Postgres Count Performance
Everybody counts, but not always quickly. This post looks into how the PostgreSQL database optimizes counting. In Postgres, there are ways to count orders of magnitude faster. We’ll look at exact counts (distinct counts) as well as estimated counts, using approximation algorithms such as HyperLogLog (HLL) in Postgres.
2394
Enabling Continual Learning in Neural Networks
Computer programs that learn to perform tasks also typically forget them very quickly. We show that the learning rule can be modified so that a program can remember old tasks when learning a new one. This is an important step towards more intelligent programs that are able to learn progressively and adaptively.
2395
Explaining the browser's event loop, tasks, and microtasks
When I told my colleague Matt Gaunt I was thinking of writing a piece on microtask queueing and execution within the browser's event loop, he said "I'll be honest with you Jake, I'm not going to read that". Well, I've written it anyway, so we're all going to sit here and enjoy it, ok?
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Visual Guide to NoSQL Systems
There are so many NoSQL systems these days that it's hard to get a quick overview of the major trade-offs involved when evaluating relational and non-relational systems in non-single-server...
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Where Rust really shines
Yesterday I was working on a small feature for the Rust compiler, and came across a situation which really showcased Rust’s awesomeness as a language …
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Thoughts on porting NumPy to PyPy
Last weekend, I attended GitHub's PyCodeConf in Miami Florida and had the opportunity to give a talk on array-oriented computing and Python....
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Superlogical
I authored 1 the announcement post on the Superlogical homepage , which describes the problem statement and what we're building. 2 Read that to learn more. This post is more of a personal statement about what led to this, how it relates to my recent work, and what comes next.