Viewing profile — jbapple
jbapple
HN member- Joined
- Fri, Jul 24, 2009, 4:34 AM UTC
- HN karma
- 863
- Public activity
- 297 items
- HN profile
- View on Hacker News ↗
About jbapple
Recent public activity
-
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…
-
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…
-
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…
-
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…
-
comment
Comment #21895202
See also https://web.archive.org/web/20190927163255/http://cantorsatt...
-
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…
-
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?
-
comment
Comment #21759876
Can you explain more?
-
comment
Comment #21594988
> Has anyone explored regexp minimization? There has been significant work on https://en.wikipedia.org/wiki/DFA_minimization
-
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…
-
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 …
-
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?
-
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…
-
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'…
-
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…
-
comment
Comment #20729846
But logit-weight trees have logarithmic height, yes?
-
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…
-
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…
-
comment
Comment #18274400
> portfolio theory means that serious due diligence isn't worth the effort. Could you expand on this?
-
comment
Comment #18216963
What do you mean by "Zig is optimal"?
-
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 …
-
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…
-
comment
Comment #17536004
Second Google hit when searching for the paper title: https://www.cs.vu.nl/~herbertb/papers/osreview2008-2.pdf
-
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 …
-
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 …