Adam Getchell

[Adam Getchell @adamgetchell]

Today I released CDT++ v1.0.0.
This code is older than my son.
What began as research software for Causal Dynamical Triangulations is now a tested, documented, citable archival reference. It feels good to give an old project the ending it deserves.

https://t.co/7jUERXM7jM

[Adam Getchell @adamgetchell]

@KurtSchlichter Try an H&K VP9 or Walther PDP also, both have great triggers and are very reliable.

[Adam Getchell @adamgetchell]

Going through old research C++ code, updating libraries, tests, and build tooling. Ironically, the one place TSAN would be most useful is in the parallel path -- and I have to exclude it because oneTBB’s scheduler immediately triggers a race report.

[Adam Getchell @adamgetchell]

I just had a legit reason to use git cherry-pick.

[Adam Getchell @adamgetchell]

@josiahjdp This was a great story, written with lovely, truthful, and painful sentiment and evocative prose. Thanks for sharing!

[Adam Getchell @adamgetchell]

Just landed a major performance win in la-stack 0.4.0:

Exact determinants are now up to ~40× faster.

Key changes:
• Stack-based storage (no heap churn)
• IEEE 754 bit decomposition → exact BigRational
• Integer-only Bareiss (BigInt)

Example:
D=5 det_exact: 164µs → 4.2µs (~39×)

Exact arithmetic is finally practical.

#rustlang #numerical #linearalgebra #scicomp #algorithms #opensource

[Adam Getchell @adamgetchell]

If you want to see it in action:

• 1D Ising model (Metropolis): https://t.co/qpuOjxch4q
• docs: https://t.co/Ojrxo7Zb4D

Would love feedback from folks working in Rust / MCMC / scientific computing

[Adam Getchell @adamgetchell]

🚀 Released markov-chain-monte-carlo v0.2.0 in Rust

A composable MCMC design with symmetric mutable + immutable APIs 🧵👇

#RustLang #MCMC #ScientificComputing
https://t.co/KRdpX7jcoH

[Adam Getchell @adamgetchell]

Already using this in https://t.co/qq6Jg7AzJD

to drive Monte Carlo moves in simulation workflows

[Adam Getchell @adamgetchell]

Then you’ll have to explain the following interconnected evidence that an electron is pointlike, with no substructure:

1. Differential cross-sections at, e.g. LEP and HERA of <10E-22 meters
2. Anomalous g-2 magnetic moment agreeing with QED to 12 decimal places, where QED treats the electron as a point
3. Perfect spherical charge symmetry, where asymmetries would break Lorentz invariance
4. No detectable Electron Dipole Moment in high precision searches
5. No excited or bound states even at TEV scales in the LHC

[Adam Getchell @adamgetchell]

Repo: https://t.co/nTIJElGloL
Crate: https://t.co/xA8cYWBKlK

Highlights:
• const generics
• zero-cost abstractions
• compile-time determinants for D≤4
• optional exact arithmetic when robustness matters

cargo add la-stack

[Adam Getchell @adamgetchell]

🚀 la-stack was featured in the March 2026 issue of Scientific Computing in Rust Monthly:

https://t.co/G26R9I2NWz

A Rust-native, fast, stack-allocated linear algebra package for fixed dimensions focused on correctness, performance, and composability.

Rust for scientific computing is getting real.

#RustLang #ScientificComputing #HPC

[Adam Getchell @adamgetchell]

@xai The birth of the first true megacorp. 🦾

[Adam Getchell @adamgetchell]

@dr_cintas Seems buggy so far though, most of my other extensions don’t work with it.