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Viewing profile — ahh

ahh

HN member
Joined
Sun, Apr 10, 2011, 1:07 AM UTC
HN karma
790
Public activity
206 items

About ahh

I work on performance optimization, malloc implementations, threading models, CPU scheduling, and lots of other bits of low level systems. I live in New York.

Recent public activity

  1. comment
    Comment #37729848

    Psychosomatic illnesses are in fact quite serious, but they require psychological treatment, not lockdowns of society.

  2. comment
    Comment #34930905

    God, do I love working in the finance industry some times.

  3. comment
    Comment #34526279

    Interestingly, Matt has invented a variant on the retpoline [1] which _intentionally_ missteers the branch predictor to prevent various speculative attacks. (Invented by my former …

  4. comment
    Comment #34121847

    > Do they have special interview channels for 'regular devs' and another for people who can write dynamo ? Not special interviews, but certainly different pieces of headcount. Ther…

  5. comment
    Comment #32485856

    The supersonic speed was the question, not the contrarotation.

  6. comment
    Comment #32484993

    What about the Tu-95? It's famously loud due to (says Wikipedia) supersonic propeller tips. Do you know why they're still effective?

  7. comment
    Comment #31624651

    It's the transition that kills you. Are you doing this full time?

  8. comment
    Comment #31517108

    I don't know anyone whose house has burned down. Should I cancel my home insurance?

  9. comment
    Comment #31450746

    > As far as fining motorists for horn usage, if it works like everywhere else in the US there is no way they could ever actually make good on the fines. Confiscate their cars, prob…

  10. comment
    Comment #31446064

    > In 2021, New Yorkers filed the most complaints about engine idling since 2018: 13,489 complaints. The police issued 75 summons in response to complaints, data shows. > Specifical…

  11. comment
    Comment #31200660

    https://research.google/pubs/pub50370/ gives more up to date information, as does the slide deck here: https://docs.google.com/presentation/d/1taP_gqeRE1XGB2td7f32... (We get down …

  12. comment
    Comment #30321775

    You are welcome to advocate for pleasant, humane prisons. Run whatever antirecidivism campaigns you wish there. If they work, that's great. In either case: send people who commit c…

  13. comment
    Comment #30317178

    No, the issue is that we don't have the political will to arrest, prosecute, and imprison criminals, until our societies consist of people who don't commit crime.

  14. comment
    Comment #30317173

    I think you're misinterpreting GP: even though it is true that possession-like crimes are badly handled by the US, you can erase them entirely and the US _still_ has a larger priso…

  15. comment
    Comment #30316777

    That's nice. Feel free to fix the prison system at any time; if the people who come out don't commit more crimes, I'll be happy. In the meantime, imprison the people who do commit …

  16. comment
    Comment #30316327

    If they spend time in jail after the first time, maybe they won't become a habitual thief.

  17. comment
    Comment #30316320

    Because it's fun, easy, and beats working. Unless we arrest, prosecute, and imprison them. Or punish them other ways; how about flogging? It's arguably both a better deterrent and …

  18. comment
    Comment #30316300

    If only 1/5th of those prisoners are there for drug-crime (and I assume you believe as I do that much drug-related crime isn't worth the arrest?) then isn't that in fact evidence t…

  19. story
  20. comment
    Comment #27147760

    Yeah, but you know what also works? Running perf and running that through normal pprof...

  21. comment
    Comment #26764031

    The causation is backwards! I'm not an alcoholic but I am an anxious wreck. Single best way to make me stop freaking out at a party? Two old fashioneds. I'd prefer to be gregarious…

  22. comment
    Comment #25667067

    I can confirm we came up with this optimization inside tcmalloc, and our compiler experts nacked it as unsafe, even only calling tightly controlled code. A pity, as it is really be…

  23. comment
    Comment #25107875

    For string interpolation, check out: https://github.com/janestreet/ppx_string I was just remarking to a coworker Friday how happy this made me; you get to write nice, obvious, read…

  24. comment
    Comment #24683802

    I'm rather proud of Abseil's implementation: https://github.com/abseil/abseil-cpp/blob/887d0eee6bab358472... As I recall another colleague wrote the original version (I do not reme…

  25. comment
    Comment #23921035

    Mostly market driven (I expect there are some regulatory concerns too but I don't know any offhand.) What this means is that there are very few holders of TSLA stock who are willin…