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This is a recap of the top 10 posts on Hacker News on Oct 21, 2025.Feel free to leave feedback on Github: https://github.com/denolfe/hacker-news-highlights(00:00) - Intro (00:20) - Today is when the Amazon brain drain sent AWS down the spout (01:30) - Claude Code on the web (02:36) - A laser pointer at 2B FPS [video] (03:34) - Alibaba Cloud says it cut Nvidia AI GPU use by 82% with new pooling system (04:50) - Production RAG: what I learned from processing 5M+ documents (06:03) - BERT is just a single text diffusion step (07:15) - ChkTag: x86 Memory Safety (08:33) - How to stop Linux threads cleanly (09:33) - My trick for getting consistent classification from LLMs (10:40) - x86-64 Playground – An online assembly editor and GDB-like debugger (11:51) - Outro Today is when the Amazon brain drain sent AWS down the spouthttps://www.theregister.com/2025/10/20/aws_outage_amazon_brain_drain_corey_quinn/https://news.ycombinator.com/item?id=45649178Claude Code on the webhttps://www.anthropic.com/news/claude-code-on-the-webhttps://news.ycombinator.com/item?id=45647166A laser pointer at 2B FPS [video]https://www.youtube.com/watch?v=o4TdHrMi6dohttps://news.ycombinator.com/item?id=45632429Alibaba Cloud says it cut Nvidia AI GPU use by 82% with new pooling systemhttps://www.tomshardware.com/tech-industry/semiconductors/alibaba-says-new-pooling-system-cut-nvidia-gpu-use-by-82-percenthttps://news.ycombinator.com/item?id=45643163Production RAG: what I learned from processing 5M+ documentshttps://blog.abdellatif.io/production-rag-processing-5m-documentshttps://news.ycombinator.com/item?id=45645349BERT is just a single text diffusion stephttps://nathan.rs/posts/roberta-diffusion/https://news.ycombinator.com/item?id=45644328ChkTag: x86 Memory Safetyhttps://community.intel.com/t5/Blogs/Tech-Innovation/open-intel/ChkTag-x86-Memory-Safety/post/1721490https://news.ycombinator.com/item?id=45582958How to stop Linux threads cleanlyhttps://mazzo.li/posts/stopping-linux-threads.htmlhttps://news.ycombinator.com/item?id=45589156My trick for getting consistent classification from LLMshttps://verdik.substack.com/p/how-to-get-consistent-classificationhttps://news.ycombinator.com/item?id=45571423x86-64 Playground – An online assembly editor and GDB-like debuggerhttps://x64.halb.it/https://news.ycombinator.com/item?id=45646958 What is Hacker News Highlights? Daily overview of the Top 10 Hacker News posts. Post and comment summarization by AI.