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CPU cache-friendly data structures in Go
False sharing, AoS vs SoA, random access, branch prediction: re-measured with go test -bench on two machines. Some claims held, some didn't.
New
The latest blog posts to take off on Hacker News. 4,109 posts.
1082
Why we need SIMD
tl/dr: it can deliver big performance speedups at modest area cost
1083
Why do LLMs freak out over the seahorse emoji?
Investigating the seahorse emoji doom loop using logitlens.
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Packing the world for longest lines of sight
I have a side project to find the longest line of sight on the planet 1 using a novel Total Viewshed algorithm . At a resolution of 3 arc-seconds (~92m x 92m), the planet contains around 4.5 billion elevation samples 2 . Now obviously we don’t need to calculate the visibility between literally every single one of…
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Memory access is O(N^[1/3])
In computer science, we often compare the efficiency of algorithms by describing their runtime as a function of the size of the input. Sorting is O(n * log(n)), meaning that sorting a list of N items takes an amount of time proportional to the number of items multiplied by its logarithm. Matrix multiplication is…
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What GPT-OSS leaks about OpenAI's training data
OpenAI recently released their open-weights model. Here we'll discuss how that inevitably leaks some information about their model training stack, and, on the way, show that GPT-5 was trained on phrases from adult websites....
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NIST's DeepSeek "evaluation" is a hit piece
How NIST Turned Open Science into a Security Scare
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The QNX Operating System
Quantum Software and the microkernel UNIX
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Beginner Guide to VPS Hetzner and Coolify
I set up my own VPS, documented every step, and ended up with a repeatable deployment pipeline. This is both a checklist for my future self and a guide for a...
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Self hosting 10TB in S3 on a framework laptop and disks
About 5 months ago I made the decision to start self hosting my own S3 . I was working on AppGoblin’s SDK tracking of the top 100k Android and iOS apps so was wanting a lot of space, but for cheap.
1092
Benefits of choosing email over messaging
My colleagues and friends know that I prefer to communicate with them via email rather than chat messaging. There are many benefits in such a choice. You may want to consider them and adopt the same stance.
1093
Lánczos Interpolation Explained (2022)
When you resize, rotate, or in any way transform an image; or more generally when you resample some discrete signal, the software you are using must _interpolate_ between the discrete points to produce a result. Linear and cubic interpolation are easy to explain, but Lánczos interpolation, one of the most popular…
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NSA and IETF: Can an attacker purchase standardization of weakened cryptography?
It's normal for post-quantum cryptography to be rolled out as an extra layer of security on top of traditional pre-quantum cryptography, rather than as a replacement .
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Matrix Core Programming on AMD GPUs
In this blog post, we walk through how to use Matrix Cores in HIP kernels, with a focus on low-precision data types such as FP16, FP8, and FP4, as well as the new family of Matrix Core instructions with exponent block scaling introduced in the AMD CDNA™4 architecture. Through code examples and illustrations, we…
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How I influence tech company politics as a staff software engineer
Many software engineers are fatalistic about company politics. They believe that it’s pointless to get involved, because: Technical decisions are often made for…
1099
Self-hosting email like it's 1984
Notes from setting up a truly minimal self-hosted email server with Postfix and OpenDKIM. Covers TLS, SPF, DKIM, DMARC, DNS, reverse DNS, multiple domains, and delivering to Gmail.
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Circular Financing: Does Nvidia's $110B Bet Echo the Telecom Bubble?
Nvidia's $110B vendor financing strategy mirrors Lucent's telecom bubble playbook. Analyzing customer concentration, GPU-backed debt, depreciation schedules & cash flow patterns to assess AI bubble risks.
1101
How functional programming shaped and twisted front end development
A friend called me last week. Someone who’d built web applications back for a long time before moving exclusively to backend and infra work. He’d just opened a modern React codebase for the first time in over a decade.
1102
Alibaba cloud FPGA: the $200 Kintex UltraScale+
Using a decommissioned Alibaba cloud accelerator card as an FPGA dev board
1103
Sora Update #1
We have been learning quickly from how people are using Sora and taking feedback from users, rightsholders, and other interested groups. We of course spent a lot of time discussing this before...
1104
Zig builds are getting faster
Andrew Kelley famously (or infamously, depending on your views) said "the compiler is too damn slow, that's why we have bugs." 1
1105
Arenas in Rust
At one level, this question is not very fair, because an answer to it as stated would be that one simply does not use doubly linked lists. They have been popular in introductory computer science lectures because they are a neat way to explain pointers in a data structure that's easy to draw on a whiteboard, but they…
1106
WireGuard topologies for self-hosting at home
I recently migrated my self-hosted services from a VPS (virtual private server) at a remote data center to a physical server at home. This change was motivated by wanting to be in control of the hardware and network where said services run, while trying to keep things as simple as possible. What follows is a…
1107
Be Worried
Author's note: I wrote this in March 2023, but just published in October 2025. I held back from publishing this originally for fear that I was being sensationalist. But with the launch of Sora 2, I couldn't not share these thoughts. I only regret I didn't publish it 2 years ago.
1108
The collapse of the econ PhD job market
What is an Economics PhD worth in 2025?
1109
OpenAI Is Just Another Boring, Desperate AI Startup
What is OpenAI? I realize you might say "a foundation model lab" or "the company that runs ChatGPT," but that doesn't really give the full picture of everything it’s promised, or claimed, or leaked that it was or would be. No, really, if you believe its leaks to
1110
Cancellations in async Rust
Correctness in the face of cancellations: a written version of my talk at RustConf 2025.