#Define

A ground-up, zero-dependency implementation of K-Means, Agglomerative Hierarchical Clustering, and the Elbow Method in pure C for retail customer segmentation.

TL;DR:* ported upstream 712e60f9ed into the Webtatic php71w 7.1.33 SRPM, rebuilt on a CentOS 7 container, ~35 min to build, ~6 s of php-fpm downtime per host. Two gotchas at the bottom.…

Learn how to control LED matrix signboard via web using ESP32, how to send the text via web to ESP32 and display it on the LED matrix.

Testing Private Logic in C++ Libraries Without Breaking Encapsulation When developing...

NVIDIA CUDA remains the foundation of GPU-accelerated computing, powering everything from scientific simulations to large-scale AI training. But writing correct…

A deep dive into converting a simple arithmetic expression into a binary tree, leading to a custom language in C.

History of how I made portable my transputer C compiler to work in modern platforms.

A few words and thoughts about the upcoming support for quite a few Sierra cameras (Sanyo VPC-G1, Epson PhotoPC, ...) on Quicktake for Apple II.

My brother and I spent a lot of time designing our eBPF security agent to be really fast from the ground up, but recently we discovered we could make it much faster using memoization!…

Many security bugs are race conditions, where multi-threaded execution has to occur with the righ...

We have published Qubes Security Bulletin (QSB) 118: Dom0 arbitrary code execution in qvm-copy-to-vm error reporting. The text of this QSB and its accompanying cryptographic signatures are reproduced below, followed by a general explanation of this…

HN comments are terrible. On any topic I’m informed about, the vast majority of comments are pretty clearly wrong. Most of the time, there are zero comments from people who know anything about the topic and the top comment is reasonable sounding but…

Something I must confess is that I absolutely hate writing these blog posts. It’s not quite as bad as having to give a conference talk, but it’s up there on the list of activities that feel like pulling teeth to me. Not that I’m not proud of the result.…

A very very very very very very very long interrupt - xoreaxeaxeax/smiiiiiiiiiiiiiiii

The real, physical Cornell box. From Modeling the Interaction of Light Between Diffuse Surfaces, by Goral et al 1984

I spent a whole month researching FreeBSD's kernel's virtual memory system to understand why tools like htop, btop and fastfetch report different information about RAM usage. I ended up submitting patches to all of these projects.