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...

[New Blog Post] Primitive, Leveled, and Quantifier Union Finds www.philipzucker.com/prim_level_uf/ #logic #egraph

"you need to hear about the firmware bug I just spent two full days dealing with," my friend says before describing the THIRD 0day he's found this year while pursuing his hobby projects

After bothering the maintainers of gojekyll (which works very close to 100% for my blog!) I now know that my site uses a lot of weird Jekyll quirks and features that I did not know I was using I did just find github.com/betterwebini... too but that mostly just crashed on my site :(

I love that someone had this website idea and (presumably) a bunch of teams worked together to actually pull it off so well! www.incommonwith.com/collections/...

Have some good writing time for the next week or so. Any requests for what I should write a blog post about? Doesn't have to be PL/compiler related, I suppose

I have been writing blog posts in a text editor and using a static site generator for about 12 years now but I found myself reminiscing about the web auto-save publish-on-click flow. There's a certain romance to it.

@maplant.com challenged me in high school to write an RPN calculator/interpreter and I struggled with it so much that it gave me a complex and now I write compilers for a living

His and hers stacks of unread magazines (Communications of the ACM and The Atlantic)

Went and looked at a repo on GitHub. "Hey, looks neat," I think. The readme thanks its contributors, including.... me? Apparently I committed 7 times in 2016. Who knew

Our compiler uses AI* and LLMs* to do advanced reasoning and make your code much faster! * Abstract Interpretation * Large Lattice Models

I hope in 100 years when we have flying autonomous taxis or whatever Boston still slaps ugly hackney carriage plates on them

scheme-rs now has delimited continuations github.com/maplant/sche...

This post has been sitting around in my drafts since March... I hope it has its intended effect bernsteinbear.com/blog/compile...

I'm very honored to have received this year's RubyPrize from Matz's hands in Matsue last Thursday, recognizing my work on Ruby and its development tools. I can still remember how nervous I was asking Matz for a picture back in 2016 😂 Time really flies (Photo from @hsbt.org ❤️)

Come join us playing geoguessr! www.geoguessr.com/join/ZS5KE?s...

❯ ruby -v ruby 4.0.0dev (2025-11-07T11:42:29Z master 1f32464a2d) +YJIT +MN +PRISM [arm64-darwin24]

it has been a while, but whoo, new bloggery: "wastrel, a profligate implementation of webassembly" https://wingolog.org/archives/2025/10/30/wastrel-a-profligate-implementation-of-webassembly

Gotta watch *the episode* in her honor tonight. www.nytimes.com/2025/10/28/a...

I'm excited to share that I became a Ruby committer today! A 10 year goal since RubyKaigi 2015. Huge thanks to @bernsteinbear.com for the JIT mentorship and nomination, @k0kubun.com for years of guidance, and everyone who supported me along the way. Looking forward to improving Ruby and its DX!

me (recently into bouldering): CI: me: CI: ... me: nice, come on CI: ... me: yeah, come on... CI: ... me: CI: ... me: COME ON!! CI: ... CI: ❌ me: ah! good attempt!!

please enjoy: my Wasm-hosted, Wasm-targeting build of Clang/Clang++/LLD: a self-contained, 25 MiB (gzipped) pure function www.npmjs.com/package/@yow...

Interpreter alignment chart

it has been 0 days since I wrote a tiny interpreter to prototype some new database features. you will never regret writing a tiny interpreter

“…bucking tradition…”?? You guys. No

The worst trend in journalism is sucking up to Trump. The second worst trend is "scrollytelling", where you scroll for three days before finding the lede

Walking around the compiler bernsteinbear.com/blog/walking...

Walking around the compiler bernsteinbear.com/blog/walking...

There is no thriving #Haskell community without its members of the LGBT community, and on that there cannot be any compromise.

Finally an accurate, non-cutesy headline from the NYT about Trump crushing free speech: Trump says broadcasters should lose their licenses for criticizing him.

I did so much programming on a 10.1" netbook that weighed no more than a frisbee (and I did sometimes frisbee it across the room). It couldn't compile large projects fast so there was a lot of coding between compiles. When I miss those days I don't use my external monitor but it's not the same.