One more time — I'm looking for new consulting clients. Some ways I can help: ∙ Fractional tech leadership (tackling "leadership debt" in small eng orgs) ∙ Full-stack, 0 to 1 projects ∙ Language design & impl (eg with @ohmjs.org) ∙ JavaScript/TypeScript perf (🔁 appreciated)

Sharon Korean Kitchen in Boston is great. Stumbled across it and thoroughly enjoyed. Vegetarian friendly, too

The Swift Performance team isn’t *my* team, but they’re in my hallway. Or in London if you’d prefer. They’re looking for an engineer who’s not afraid of optimizers. jobs.apple.com/en-us/detail...

I wrote a tiny vectorized interpreter last night, and .. thought I'd write up a post describing it. Nothing earth shattering here, but if you haven't seen one of these before it could be interesting! Probably easier to read than the J Incunabulum, but also less .. wow. github.com/frankmcsherr...

I wrote a little extremely DIY fuzzer for the load/store optimization in the toy optimizer! bernsteinbear.com/blog/toy-fuz...

So my friend Chris taught me what byte pair encoding is and then I was idly thinking about it and I wonder if people can/do use this for generating bytecode interpreter superinstructions.

I wrote a little extremely DIY fuzzer for the load/store optimization in the toy optimizer! bernsteinbear.com/blog/toy-fuz...

It's actually by MarshDeer: marshdeer.github.io/xkcd2501-gen...

S's new iPhone started setup at the Apple store. Only WiFi network it knew was "Apple Store". We leave midway through the update. Realize at home we can't connect to a new network. What to do? Configure the access point to make a new network called "Apple Store", of course.

A bit late and not yet finalized, but our program for MoreVMs'26 is online. Early registration deadline is in a few hours, but will remain open afterwards still. Join us in Munich for a day of talks around language implementation! 2026.programming-conference.org/home/MoreVMs...

[New Blog Post] Weighted Union Find and Ground Knuth Bendix Completion www.philipzucker.com/weighted_uf/

Load-store elimination, now with type-based alias analysis (TBAA) bernsteinbear.com/blog/toy-tbaa/

The Dalai Lama walks into a union-find shop and says can you make me one with everything

Load-store elimination, now with type-based alias analysis (TBAA) bernsteinbear.com/blog/toy-tbaa/

Shrek 2 holds up and is a good Valentine's Day movie

My former (excellent!) compiler intern is now in team matching at Google for full time. Anyone on Dart, V8, Go, ... who would chat with them? Thank you!!

You're absolutely right. The vertical axis is not X, it's Y.

Coming soon to Python 3.15: frozendict The Steering Council has just accepted @vstinner.bsky.social and @corona10.bsky.social's PEP 814 "Add frozendict built-in type". discuss.python.org/t/pep-814-ad... peps.python.org/pep-0814/ #Python #PEP814 #frozendict #Python315

I am pleased to announce the first version of scheme-rs has been released for general consumption! Please checkout the website www.scheme-rs.org, the GitHub page github.com/maplant/sche..., or the announcement at maplant.com/2026-02-09-I...

Woke up from a dream about union find so it's going great

you have probably heard that webassembly supports garbage collection. are you looking for an ahead-of-time compiler for wasm with gc? as it happens, i have written a little monograph on the topic wingolog.org/archives/202...

roll thru our geoguessr game! www.geoguessr.com/join/M2AUU?s...

My graphs,, they are not flowing bernsteinbear.com/blog/multipl...

My graphs,, they are not flowing bernsteinbear.com/blog/multipl...

Since it's on HN right now,

[New Blog Post] Contextual Union Finds www.philipzucker.com/context_uf2/ #egraphs #logic

This is a huge release for TruffleRuby. It’s our first under our new org. If you’ve been hesitant about contributing because of the CLA, please note that we no longer have one. We can also release more frequently so please report bugs or open PRs.

Very cool research made it into TruffleRuby!

Has anyone written up the kind of reasoning you do in a JIT with speculative deoptimization where you can say X operation "has no effects" because if it had an effect, we would have left the current translation unit? I feel like it's really interesting but don't even know how to search for this

Every time I see the helix editor's tagline, my brain immediately sings "I am the very model of a modern modal editor"

Another successful drive-by contribution to ZJIT from a "stranger"! Thank you, Nozomi Hijikata! github.com/ruby/ruby/pu...

Over a year late, I finally figured out and set up KVM on my monitor. It's amazing. 2026 is the year I stop manually switching cables back and forth ~daily

New blog post about the GDB JIT interface. This brings me to 30 blog posts this year...! bernsteinbear.com/blog/gdb-jit/

New blog post about the GDB JIT interface. This brings me to 30 blog posts this year...! bernsteinbear.com/blog/gdb-jit/

Rachel Kozlowski's Dapper Animal plate series has me in a chokehold. I love them

new post about load/store elimination merry christmas! bernsteinbear.com/blog/toy-loa...

ZJIT is available starting in Ruby 4.0! Please try it out on your test suite, maybe in a staging environment, and let us know how it goes! railsatscale.com/2025-12-24-l...

Alright stop, collaborate and listen [Fabr]ice is back with my brand new invention github.com/bellard/mqui...

Why Does The Ubuntu Upgrade Need One Thousand Of God's Own Megabytes In My Boot Partition ?

Brief post today about the Linux perf map interface bernsteinbear.com/blog/jit-per...

Ruby 4.0.0 preview3 is released! Give ZJIT a go by running it on your CI and let us know in Zulip what broke! www.ruby-lang.org/en/news/2025... docs.ruby-lang.org/en/master/ji... zjit.zulipchat.com

There has been outrage as the @acm.org rolls out AI generated summaries of papers. This is doing AI exactly wrong by replacing valuable, peer-reviewed content with a possibly inaccurate summary. It's still not too late to correct it though and use AI responsibly... anil.recoil.org/notes/acm-ai...

HN is down :/ what do I do with my time

Oh hey so yeah we shipped a beta today! #ty #python astral.sh/blog/ty

Sorry for not offering this earlier, but if you're a parent of a Brown student and they need help (a ride, a coffee, whatever), please email me and I'm happy to try to help. cs.brown.edu/~sk/Contact/

One thing I'm really excited about in Ruby 4.0 is that object allocation is going to get a nice speed boost

I’m incredibly excited to serve on this coming term’s Steering Council! Working on CPython has been one of the most rewarding endeavours of my career. I’m so grateful to everyone who voted & honoured that so many placed their trust in me. peps.python.org/pep-8107/

This week, three people shared their handmade programming languages. We learned not only about their features and syntax but the philosophies, joys, and challenges around building them. Could you build your own language? Should you? We dare say… yes!

The MoreVMs workshop has two submission deadlines this time: Pre-Holiday: 17 December 2025 Post-Holiday: 12 January 2026 We know, nothing happens without a deadline.⌛️💣 So, there you go. You made me do it! 🤣😅 😇 Anyway, pick one and submit! 🧑‍🔬🧪✍️📜 2026.programming-conference.org/home/MoreVMs...