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kooi

HN member
Joined
Thu, Jul 30, 2026, 12:17 AM UTC
HN karma
15
Public activity
39 items

About kooi

Research Engineer

Current research Interests: Rust for embedded systems, real time signal processing, control barrier functions for robotic manipulators

Education: M.S ECE UCSC (2020)

https://sites.google.com/view/david-kooi/

Recent public activity

  1. story
    Show HN: More Branchless Optimization

    I thought the recent post about branchless optimization in Rust was pretty cool. This morning I came across a HN post about someone's hand rolled word counter in C. I realized it w…

  2. comment
    Comment #49215313

    I got inspired by that branchless rust post a couple days ago. Tried it out here and got a ~50% speedup on a 10 million word file. (Averaged over 100 runs). File IO was the real bo…

  3. comment
    Comment #49214070

    Only anecdotal benchmarks for what ever that is worth. I notice the LLM reasoning things like: "The maintainability score went down, let me look.... I see I've duplicated existing …

  4. comment
    Comment #49212482

    Personally, I'd make the NULL_PTR error message a bit more specific. "Memory Error" is quite general. The real issue is that specific invalid arguments were passed in. Now since th…

  5. comment
    Comment #49212437

    Also, for some reason the "standard" in C return values is 0 for success.

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  7. comment
    Comment #49212407

    Seems pretty good. When I was at NASA, their C coding required everything to be explicit. So `if(!w_cnt || !r_cnt) return NULL_PTR; ` was wrapped in real brackets. I was also told …

  8. comment
    Comment #49205634

    Add Sentrux to the LLM loop. https://github.com/sentrux/sentrux It's an offline coding grader. It works well: You ask for a new module, LLM starts spitting out bloated crap, the co…

  9. comment
    Comment #49198218

    I've been wondering if OpenAI make Luna artificially cheap to get people into their eco system. I think it's great and hope the price can stay the same.

  10. comment
    Comment #49193280

    Fountain codes are so lit

  11. comment
    Comment #49193273

    As someone who has implemented acoustic modems (underwater comms)... yes, yes very annoying. It's like a demonic dolphin. Bringing it into the ultra sonic band would help.

  12. comment
    Comment #49176625

    Standard disclosure of "I'm no LLM expert". Could tokens be pre-embedded and saved? Suppose you're transferring a context to another agent. Currently I just copy/paste, tell the ot…

  13. comment
    Comment #49173589

    IMO this is what makes rust excellent for LLM coding. Sure other languages support this type of design by interface, but I feel like Rust's compiler forces the LLM to conform to ex…

  14. comment
    Comment #49159390

    I mean at the end of the day, if it works, it works!

  15. comment
    Comment #49159372

    Oof, is it a fig tree or a fiddle leaf leaf tree, that's hilarious. There's the new pelican bench mark

  16. comment
    Comment #49159352

    sKiLl IsSuE - some redditor XD Agreed with the caveat that I think if you know what you're doing and are very cognizant, LLM generated Rust is amazing. I feel like it's hard compil…

  17. comment
    Comment #49159229

    It's kind of like assembly moving to C moving to Python, etc... That does not mean the need to C and assembly developers will disappear. Same thing with "manual coding" and "orches…

  18. comment
    Comment #49156361

    Infinitely, that's a stretch. Over the past year maybe 1.5x to 2.0x for me. As in: I can work on two projects at the same time with reduced amount of context switch. But that's it …

  19. comment
    Comment #49156302

    Any competent developer knows there are limits to prompting. Personally I've found LLM's suck at multi-threaded applications. (Because I've been tempted by the ~agentic loop~ and b…

  20. comment
    Comment #49156215

    It happens outside the developer world as well. People get information from Google AI mode and take it as 100% truth. In reality, blogs, reddit, and junk are often sourced link...w…

  21. comment
    Comment #49151257

    here-here

  22. comment
    Comment #49150242

    Lol. "AI watermark"... that's something important and should be in all AI generated images.

  23. comment
    Comment #49149770

    It's a good idea. Some of the readme sounds very vibed. I like the crypto element, but not sure how this relates to proving the shutdown sequence is implemented. Can't a robot sign…

  24. comment
    Comment #49148926

    I think the most important insight is the limitation of LLM perception:Slowly taking screenshots. That method of perception probably scales N^2... so sure with more compute, LoTR a…

  25. comment