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Your test suite is trying to tell you something
A few weeks ago I started wondering about 'the test that occasionally and randomly breaks' in a large test suite at my job. The test, calle...
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 21,842 posts.
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Testing Memory Allocators: ptmalloc2 vs. tcmalloc vs. hoard vs. jemalloc
Quote: if you DO want to get performance from changing mallocs, make sure to test them with your own app Another Quote: in our humble opinion, overall winner...
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Why is calling my asm function from Rust slower than calling it from C?
This is a follow-up to making the rav1d video decoder 1% faster, where we compared profiler snapshots of rav1d (the Rust implementation) and dav1d (the C …
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Minimum Viable Declarative GUI in C++
Techniques for defining a declarative GUI in C++
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Stackoverflow 2019 Developer Survey Is Open
What languages do you want to work with next year? Are you more productive in an office or working from home? When did you write your first line of code? We want to hear from you in our annual developer survey ! The survey, now in its ninth year, launches today and anyone who codes is encouraged to participate. Take…
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Quicksort with Jenkins for fun and no profit
I first encountered Jenkins in 2007 while contributing to the Apache Nutch project. It was called Hudson back then. The nightly builds for the project ran on Hudson at that time. I remember sifting through my emails and reviewing build result notifications to keep an eye on the patches that got merged into the trunk…
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Understanding Serde
Serde is one of the most popular Rust crates, and deservedly so. If you aren't familiar, Serde describes itself as "a framework for serializing and deserializing Rust data structures efficiently and generically." What is most impressive to me is how robust the Serde data model has proven to be, allowing it to support…
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.NET JIT and CLR – Joined at the Hip
I’ve been digging into .NET Internals for a while now, but never really looked closely at how the ‘Just-in-Time’ (JIT) compiler works. In my mind, the interaction between the .NET Runtime and the JIT has always looked like this:
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I Won't Use Next.js
I've written tens of thousands of lines of code with Remix and I want to tell you why I love using this framework.
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Reverse Engineering the Apple Multipeer Connectivity Framework (2022)
Some time ago I was using Logic Pro to record some of my music and I needed a way to start and stop the recording from an iPhone, so I found about Logic Remote…
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Why APL is worth knowing
Let me show you characteristics of APL that will influence your understanding of programming concepts and the way you use other languages.
17209
Towards Crystal 1.0
Currently the main goal of the Crystal core team is to reach 1.0 in the near future. Since achieving that goal involves a number of non-obvious tradeoffs, we want to use this post to shed some light on those inherent tensions and how they drive our work and priorities for the next few releases.
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Fast Shadow Stacks for Go
tl;dr : Software shadow stacks could deliver up to 8x faster stack trace capturing in the Go runtime when compared to the frame pointer unwinding that landed in go1.21. This doesn’t mean that this idea should escape from the laboratory right away, but it offers a fun glimpse into a potential future of hardware…
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Adventures in Symbolic Algebra with Model Context Protocol
Personal blog of Stephen Diehl - Software engineer writing about technology, programming, and the future
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Reproducing DeepSeek's MHC: When Residual Connections Explode
DeepSeek replaced standard residuals with massive Hyper-Connections, and then watched them explode. I reproduced the 9x signal amplification to understand their fix: the Sinkhorn-Knopp algorithm. Part 1 of 2.
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Quirks of Common Lisp Types
Humans have a tendency toward binary thinking (pardon the pun). If it's not A, it's B. Perhaps because Lisps have REPLs, they are often thought of from the outside as being dynamic, interpreted languages. Our years of Python have taught us that such languages don't really have strong typing - it's all a wild guess…
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Challenges in Implementing a Full-Text-Search Engine
While Full-text-search is famous for search through documents at a faster rate, there are other interesting ways in which these systems handle scale, synonyms, abbreviations, misspellings etc., we will
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The New HAProxy Data Plane API: Two Examples of Programmatic Configuration
This blog post shows you how to use the HAProxy Data Plane API to manage your load balancer configuration dynamically using HTTP commands.
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Async Rust: Panics vs. Cancellation
One of the things people often complain about when doing Async Rust is cancellation. This has always been a bit confusing to me, because it seems to me that async cancellation should feel a lot like panics in practice, and people don’t complain about panics very often (though they do sometimes). This post is the start…
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Aura: shipping software that was delayed for 4 years because of patent licensing
Having just written rather a sad piece on my company’s blog, I thought I’d cheer myself up a bit — and explain a few things that have been hugely …