Seth Stadick

What linking means when installing a Conda package Package managers face a fundamental challenge: how to efficiently place files from a package cache into multiple environments without excessive disk usage or compromising isolation.

Another deep dive in the technology behind Conda package managers: file linking! Did you know that there are symlinks, hardlinks and reflinks? Reflinks are the best – copy on write is space efficient and isolates the cache.

Learn more: prefix.dev/blog/what-l...

Sassy solves approximate string matching: finding all matches of a pattern in a text.

Sassy is out now!

Ever need to search for approximate matches of short DNA strings?
Sassy is the tool to use!

Available now wherever you get your code

With @rickbitloo.bsky.social

curiouscoding.nl/papers/sassy...
github.com/ragnarGrootK...

It’s come up for me! As a link specifically.

I’ve been wondering how Perl would fair with an llm. It manages to pack so much context into so few characters, it kind of seems like it should be great for llms?

I have no idea how to go about proving it is “good” or “bad” for an LLM though.

TIL - zless

linux.die.net/man/1/zless

Mojo Q3 Roadmap Update We’re excited to share a sneak peek of what’s planned for Mojo over the next few months! 🥳 Along with a look ahead at what’s coming this quarter, we’ve also included a review of what shipped over the ...

Q3 Mojo roadmap looking awesome!

Highlights:
- apple Silicon GPU Support
- requires clauses
- struct extensions

forum.modular.com/t/mojo-q3-ro...

That’s fair! And I don’t have any better solutions.

Based on the linked AVX2 feature share in my other reply, hopefully we can widen the “generic” simd support in compilers here at some point

* cited 🤦

* sited, not sites

They support/ run CI for the large Hw groups like Linux-64, linux-aarch, osx-64, etc.

Some good HW stats: firefoxgraphics.github.io/telemetry/#v...

Sites here: linebender.org/blog/a-plan-...

If v3 is around 75% in consumer PC, it’s got to be 90%+ for the HW for BFX

That compiles it on the CI machine I believe, so you can’t target the end user CPU features :(

You kind of can with conda features, but it’s a big pain and not standard that I can tell.

It causes me great pain that all these tools we install with conda are basically stuck with sse only

I was trying to be gracious by calling them "user thoughts". reddit's gonna reddit

From the rust community on Reddit Explore this post and more from the rust community

And a goldmine of user thoughts: www.reddit.com/r/rust/comme...

Thoughts on Rust hashing In languages like Python, Java, or C++, values are hashed by calling a “hash me” method on them, implemented by the type author. This fixed-hash size is then immediately used by the hash table or what...

Collecting more "lessons learned" stuff in this thread.

purplesyringa.moe/blog/thought...

github.com/rust-lang/ru...

String/str naming www.ncameron.org/rfcs/0060

It might have been about array/range and their relationship with Iterator/IntoIterator

Thanks for the reply! I'll keep digging.

*be imagining it

@steveklabnik.com Did you write an article about ways you wish Rust Iterators had evolved differently? Or remember who wrote that?

Mojo is about to start in on its iterator abstraction and I was looking for lessons learned from Rust, but can't find that article.

I might be imagining this it 😬

Looking for papers to cite for tight definitions of global alignment, semi-global alignment, and mapping...

I would probably be the person to ask, yet here we are.

Catching up on some releases:

Perbase 0.10.3: bugfix for --mate-fix when MAPQ scores are equal github.com/sstadick/per...

rust-lapper 1.2.0: fix to the BITS count algorithm for 25-30% improvement in perf github.com/sstadick/rus...

Happy if-let-chain stabilization day to all those who celebrate!

ExtraMojo update is live! Two added datastructures with BitVec and BBHash.

Updated for Mojo 25.4.

extramojo.github.io/ExtraMojo/Ex...
extramojo.github.io/ExtraMojo/Ex...

github.com/ExtraMojo/Ex...

ish v1.2.0 released and available via conda!

github.com/BioRadOpenSo...

Updates to Mojo 25.4
Bugfix for AVX512 on short queries
Improvement for saturating arithmetic to use LLVM intrinsics.

FastGA: Fast Genome Alignment https://www.biorxiv.org/content/10.1101/2025.06.15.659750v1

The Gap Through Which We Praise the Machine My current theory of agentic programming: people are amazing at adapting the tools they're given and totally underestimate the extent to which they do it, and the amount of skill we build doing that i...

Why do some have a shit time with LLMs for programming while others love it?

To succeed, the latter group tacitly creates tons of scaffolding and gain weird new skills. While it works, this posts explains how doing all that is an incidental consequence of bad interaction design in coding AI agents.

What's new | Modular Release notes for each version of the Modular platform.

Mojo 25.4 is out!

This is the version where the beta version of Python bindings is live 🔥

docs.modular.com/max/changelog/

And here's a blog post, announcing the release!

blog.janestreet.com/introducing-...

Well worth 10 minutes to read this. I had no idea that's how they worked.

Yearly PSA: you probably don't actually want to be using the builtin HashMap hashing algo in Rust stdlib.

nnethercote.github.io/perf-book/ha...

Comparison of manual version vs instrinsic: mojo.compiler-explorer.com/z/z3xrzK1Tr

Note that in both cases it correctly reduces to the single instruction. The win is that we don't have to rely on the compiler pattern matching that, and don't have to wait on the compiler to implement it.