Hacker News: pkhuong

New comment by pkhuong in "Steel Bank Common Lisp"

pkhuong — Wed, 25 Feb 2026 00:43:46 +0000

At least two "quantum" computing places built on SBCL.

Size-optimized generic sorting for C & C++ without function pointers

pkhuong — Sat, 21 Feb 2026 23:16:44 +0000

Article URL: https://github.com/pkhuong/tiny_batcher

Comments URL: https://news.ycombinator.com/item?id=47106038

Points: 3

# Comments: 0

New comment by pkhuong in "Digital Red Queen: Adversarial Program Evolution in Core War with LLMs"

pkhuong — Thu, 08 Jan 2026 22:37:37 +0000

How does the output fare on competitive hills like https://sal.discontinuity.info/hill.php?key=94t ?

AFAIK, the best results so far for fully computer-generated warriors have been on the nano and tiny format (https://sal.discontinuity.info/hill.php?key=nano, https://sal.discontinuity.info/hill.php?key=tiny), with much shorter warriors (at most 5 or 20 instructions).

New comment by pkhuong in "RustFS hardcoded auth token CVE (9.8)"

pkhuong — Mon, 05 Jan 2026 13:19:32 +0000

Fix (creation of the rustfs-credentials crate) smuggled in a fairly large panic fix PR https://github.com/rustfs/rustfs/pull/1291#:~:text=Fixes%20C... , "fix: Prevent panic in GetMetrics gRPC handler on invalid input"

New comment by pkhuong in "Xr0 verifier, guarantee the safety of C programs at compile time"

pkhuong — Sat, 03 Jan 2026 21:51:37 +0000

I don't see any explanation of what niche this targets relative to pre-existing tools like Checked C, CMBC, or Frama C...

New comment by pkhuong in "SQLite JSON at full index speed using generated columns"

pkhuong — Fri, 12 Dec 2025 14:24:08 +0000

Yeah, you can use index on expression and views to ensure the expression matches, like https://github.com/fsaintjacques/recordlite . The view + index approach decouples the convenience of having a column for a given expression and the need to materialise the column for performance.

New comment by pkhuong in "Litestream VFS"

pkhuong — Thu, 11 Dec 2025 23:58:13 +0000

I remember when Litestream not being a VFS was a plus https://news.ycombinator.com/item?id=29461406 ;)

New comment by pkhuong in "Giving C a superpower: custom header file (safe_c.h)"

pkhuong — Mon, 17 Nov 2025 12:54:08 +0000

> Just don't use C for sending astronauts in space

But do use C to control nuclear reactors https://list.cea.fr/en/page/frama-c/

It's a lot easier to catch errors of omission in C than it is to catch unintended implicit behavior in C++.

New comment by pkhuong in "Beating the L1 cache with value speculation (2021)"

pkhuong — Wed, 15 Oct 2025 18:57:00 +0000

> Won't it introduce risk of invalid memory access

no.

New comment by pkhuong in "How to tile matrix multiplication (2023)"

pkhuong — Tue, 07 Oct 2025 12:20:16 +0000

> only helps once you are compute rather than bandwidth bound

Asymptotically, I don't think Strassen performs Theta(n^3) memory operations in sub-n^3 time.

New comment by pkhuong in "Show HN: JPDB, GDB for Your Waveforms"

pkhuong — Sat, 04 Oct 2025 13:10:35 +0000

The target audience knows what a waveform is.

New comment by pkhuong in "Lockless MPSC/SPMC/MPMC queues are not queues"

pkhuong — Mon, 29 Sep 2025 12:24:09 +0000

SPMC ring buffer or SPMC "disruptor" aren't that bad. Multiple producers in a general ring buffer definitely introduce a lot of issues.

New comment by pkhuong in "Rendezvous Hashing Explained (2020)"

pkhuong — Thu, 18 Sep 2025 09:55:03 +0000

And this naturally extends to data replication.

New comment by pkhuong in "ReMarkable Paper Pro Move"

pkhuong — Thu, 04 Sep 2025 00:33:37 +0000

RM Pro (and this new product) has a backlight. I print everything to pdf when I want to read on the remarkable.

New comment by pkhuong in "How to slow down a program and why it can be useful"

pkhuong — Wed, 27 Aug 2025 13:30:11 +0000

Yeah, just decode. But that's nice because the effect is independent of the backend's state.

New comment by pkhuong in "FP8 is ~100 tflops faster when the kernel name has "cutlass" in it"

pkhuong — Fri, 11 Jul 2025 11:36:50 +0000

NVIDIA-inflicted in this case.

New comment by pkhuong in "P-Hacking in Startups"

pkhuong — Sun, 22 Jun 2025 15:17:57 +0000

https://en.wikipedia.org/wiki/P-value#History

New comment by pkhuong in "P-Hacking in Startups"

pkhuong — Sun, 22 Jun 2025 15:12:32 +0000

One easy slip-up with discussing p values in the context of a workflow or a decision-making process is that a process with p < 0.05 doesn't give us any bound on the actual ratio of actually good VS lucky changes. If we only consider good changes, the fraction of false positive changes is 0%; if we only consider bad changes, that fraction is 100%. Hypothesis testing is no replacement for insight or taste.

New comment by pkhuong in "Slowing the flow of core-dump-related CVEs"

pkhuong — Sun, 15 Jun 2025 16:44:51 +0000

> start reading the coredump from stdin

How does that work with multi-TB mappings, as used by niche functionality like asan?

New comment by pkhuong in "Jemalloc Postmortem"

pkhuong — Fri, 13 Jun 2025 15:31:48 +0000

You can run jemalloc configured with 16KB pages on a 4KB page system.