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jbapple

HN member
Joined
Fri, Jul 24, 2009, 4:34 AM UTC
HN karma
863
Public activity
297 items

About jbapple

[ my public key: https://keybase.io/jbapple; my proof: https://keybase.io/jbapple/sigs/QFY2bArzQTuUr1eEV4nOm2U0rl6PFl3zjpbKKQMOuRE ]

Recent public activity

  1. comment
    Comment #23054651

    The benefits are visible if you search for the word "TSX". It says: "Replacing the insert and update functions of our specialized growing hash table with Intel TSX variants increas…

  2. comment
    Comment #22652490

    Maybe it depends on what activities the ICC engages in within the US. Le Monde doesn’t have “jurisdiction” in the US (or anywhere) to arrest anyone, but they still do investigation…

  3. comment
    Comment #22107276

    When I benchmarked that a few years ago, I found the overhead of a syscall made mmap much slower (assuming the C or C++ memory allocator had already received some memory from the O…

  4. comment
    Comment #21952890

    Does this apply to integer keys in the computational models that can do operations other than simple comparisons? In the transdichotomous model, I thought the best known sorting al…

  5. comment
    Comment #21895202

    See also https://web.archive.org/web/20190927163255/http://cantorsatt...

  6. comment
    Comment #21875291

    > why would I care about people coming from other countries? I mean, what do I get in return? This is a pretty stunning question. Most people care about people other than ourselves…

  7. comment
    Comment #21760366

    Got it; thanks for explaining. I suppose in a microecon 101 model, there’s some elasticity that causes the cost of the fees to be borne partially by the merchants?

  8. comment
    Comment #21759876

    Can you explain more?

  9. comment
    Comment #21594988

    > Has anyone explored regexp minimization? There has been significant work on https://en.wikipedia.org/wiki/DFA_minimization

  10. comment
    Comment #21199835

    It's a deterministic attack vector, so significant offline computation prep work is not unusual. https://en.wikipedia.org/wiki/Algorithmic_complexity_attack https://www.freecodecam…

  11. comment
    Comment #21126078

    Assuming you ignore the constant. And if you're willing to ignore the constant, you can get O(c) access, O(N^(1/c)) insert and delete at arbitrary indices, and O(c) insert at head …

  12. comment
    Comment #21109287

    Where can I read more about the decision to develop Lean 4 in private, and what is the status of https://github.com/leanprover/lean4 , in your view?

  13. comment
    Comment #20910789

    The instruction and instruction set referenced in the comment you're referring to (PCMPxSTRy and SSE) are not AVX512; they were introduced long before AVX512 chips were manufacture…

  14. comment
    Comment #20732107

    > Weight is a weaker condition, since you can construct a polynomial weight sequence that results in linear height. I'd like to hear more. The varieties of weight-balanced trees I'…

  15. comment
    Comment #20729874

    These trees nearly identical to Scapegoat Trees, which were a rediscovery of the idea by different authors. https://cglab.ca/~morin/teaching/5408/refs/a99.pdf has the history: "A p…

  16. comment
    Comment #20729846

    But logit-weight trees have logarithmic height, yes?

  17. comment
    Comment #20095871

    Are you familiar with hybrid logical time systems like " HybridTime - Accessible Global Consistency with High Clock Uncertainty" ( http://users.ece.utexas.edu/~garg/pdslab/david/hy…

  18. comment
    Comment #19887891

    The title should be corrected to "SPARK", not "Spark". It's used all caps each time it's mentioned on the page. That's also how I've seen this tool referred to elsewhere in the pro…

  19. comment
    Comment #18274400

    > portfolio theory means that serious due diligence isn't worth the effort. Could you expand on this?

  20. comment
    Comment #18216963

    What do you mean by "Zig is optimal"?

  21. comment
    Comment #17691697

    The indexes themselves might underperform an index+VC strategy though if they don't have access to high-growth companies that are staying private. Even if investors shouldn't pick …

  22. comment
    Comment #17691681

    Over a 40-year career, assuming 4% real capital growth after inflation and a 3% safe withdrawal rate in retirement, a worker has to invest 25% of their gross income every year to h…

  23. comment
    Comment #17536004

    Second Google hit when searching for the paper title: https://www.cs.vu.nl/~herbertb/papers/osreview2008-2.pdf

  24. comment
    Comment #17183857

    > Hmm I’m seeing the opposite. The last graph shows Google’s hash table outperforming in all but a few places, including at 400k. You're exactly right, General Pizza. I was trying …

  25. comment
    Comment #17179465

    This post has some overconfident and under-researched claims: > This came about because last year I wrote the fastest hash table (I still make that claim) I'm extremely dubious of …