When working with open-weight LLMs like Qwen, controlling refusal behavior on security, administrative, prompts typically requires fine-tuning or permanent weight update. Traditional weight abliteration technique neutralizes refusal directions by projecting weight matrices orthogonal to a refusal vector. However, this permanently … Read more
Rewriting Bun with dynamic workflows An example of what dynamic workflows can unlock at scale is the recent rewrite of Bun. Jarred Sumner used dynamic workflows to port Bun from Zig to Rust with 99.8% of the existing test suite … Read more
This post is about optimizing an extremely simple AST-walking interpreter for a dynamic language called Zef that I created for fun to the point where it is competitive with the likes of Lua, QuickJS, and CPython. Why? Most of what … Read more
What Dynamic Typing Is For October 12, 2025 Unplanned Obsolescence is a blog is about writing maintainable, long-lasting software. It also frequently touts—or is, at the very least, not inherently hostile to—writing software in dynamically-typed programming languages. These two positions … Read more
When seeing the phrase “dynamic programming” in an algorithms class or leetcode study guide, the first question people ask is “what does ‘dynamic’ mean in this context?”. The key question is instead “what does ‘programming’ mean in this context?”, because … Read more
Modern GPUs often make a difficult tradeoff between occupancy (active thread count) and register count available to each thread. Higher occupancy provides more thread level parallelism to hide latency with, just as more SMT threads help hide latency on a … Read more
continuing with the DNA theme… In Catalyst, a WebAssembly implementation of the OpenSmalltalk virtual machine, there are three linguistic levels in play: Smalltalk, JavaScript (JS), and WebAssembly (WASM). Smalltalk is our primary language, JS is the coordinating language of the … Read more
Please consider subscribing to LWN Subscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to … Read more
contents methods gallery Browse my extremely slowly growing collection of HDTR images. links still photography and the passage of time There are several ways to record the passage of time in a photograph, an inherently static medium. One is to … Read more