What if Ruby 4.0 features could be implemented in pure Ruby? With TruffleRuby, that’s possible: 73% of the core library is written in Ruby itself. We currently have 10 issues tagged [easy, pure Ruby] waiting for contributors: github.com/truffleruby/...

I installed the Codex extension in VSCode, the result is it corrupts (!) my git repository when using VSCode as the git editor (EDITOR='code -w'). Filed github.com/openai/codex..., was a pain to figure it out.

New take about Ruby C extensions: append_cflags "-Wall" or "-Wextra" with -Werror is a bug waiting to explode as it overrides -Wno-$category flags from RbConfig by being added at the end. It's unnecessary too because for Ruby 1.9+ RbConfig::CONFIG["warnflags"] starts with "-Wall -Wextra"

Flying into RubyKaigi, I thought we had months to stand up AI-assisted vulnerability scanning for rubygems.org. Turns out we were out of time. We started prototyping during the conference, scanned the most critical gems, and four hours later submitted our first advisory to Nokogiri.

Not only @github.com search is broken for PRs for 24+ hours but also just the list of PRs misses some PRs entirely. I have to resort to email to even find my own PRs now.

Mustermann 4.0 released! sinatrarb.com/2026/04/27/m...

I have been trying mise (from @jdx.dev) and rbenv recently, the winner is clear: $ time ruby -e0 mise: 51ms rbenv: 152ms 100ms overhead is way too much (due to shims). Additionally: * rbenv breaks `which` which causes tricky problems. * mise can install precompiled Rubies (much faster)

Matz made a AOT compiler for a subset of Ruby: github.com/matz/spinel Great speedups but does not support metaprogramming

My talk tomorrow is at 14:50 in the #RubyKaigi Large Hall and it now includes 2 demos running at speeds you have never seen before!

TruffleRuby is running Doom at 150 FPS! In @khasinski.bsky.social #RubyKaigi talk "From C to Ruby: Porting Doom"

Great keynote by @headius.bsky.social at #RubyKaigi about JRuby this morning, I enjoyed it

ZRH 🛫 MUC ✈️ HND 🛬 HKD, #RubyKaigi I am on the way. I'm wearing a T-shirt of RubyKaigi 2016, time flies!

C interpreters underlie many of our most widely used language implementations -- but they're slow. Wouldn't it be great if we could turn them into JIT compiling VMs? This video shows what happens when we do just that to the normal Lua VM (first) and "yklua" (Lua w/JIT, second).

TruffleRuby 34 is here 🚀 Full Ruby 3.4 compatibility, up to 23% faster parsing, and a new Prism-based Ripper with 20x speedups! More details in the blog post: truffleruby.dev/blog/truffle...

More than 8 months later, I finally managed to put some thoughts about the passing of my dear friend Piotr into a post. Grief is tough. Remembering Piotr @chastell.net Szotkowski pragtob.wordpress.com/2026/04/12/r...

trivago runs a GraphQL gateway handling 9,000+ req/s per subgraph. After migrating to GraalVM Native Image, they: — eliminated warm-up — reduced replicas from 43 to 12 — cut CPU usage Learn more about their migration process and recommendations: medium.com/graalvm/insi...

I'm starting at Datadog today!

X is a fascist propaganda network by design. It‘s long past time to boycott X. It’s unfathomable no one has even tried to organize a boycott.

Just received a Most Notable Paper Award for our paper “Cross-language compiler benchmarking: are we fast yet?” published at the Dynamic Languages Symposium 2016. Congratulations to my co-authors @stefan-marr.de and Hanspeter Mössenböck!

GraalWasm just got faster! 🔥 The new threaded interpreter delivers significantly better interpreter performance. In interpreter benchmarks, total execution time is reduced by 5-40%! Details: github.com/oracle/graal...

I benchmarked which language works best with Claude Code. Ruby, Python, and JavaScript came out cheapest, fastest, and most stable! See my article in detail: dev.to/mame/which-p...

New research paper out: **Contiguous Zero-Copy for Encrypted Transport Protocols**. This paper explains we may have got the integration of symmetric cryptography into networking protocols wrong for efficiency. But we can fix it simply by ... reversing everything. A thread dl.acm.org/doi/epdf/10....

We’re pleased to announce that TruffleRuby 33.0.1 is now available. This is a bug fix release that notably adds support for structured event reporting in Rails 8.1 (and any other usage of Fiber storage) along with other compatibility work. More details at: github.com/truffleruby/...

Rubyfmt 0.12 is out! This release is a big deal. We entirely removed ripper and replaced it with Prism. This means Rubyfmt no longer needs to compile against Ruby at all. This work wouldn't have been possible without the hard work of Reese, and as a bonus treat we now have: rubyfmt.run

Just wanted to share that @rubyevents.org looks really good, I recently found the page about TruffleRuby-related talks: www.rubyevents.org/topics/truff... and of course my own profile page: www.rubyevents.org/profiles/ere...

Joined the #Ruby dev meeting this morning at 7:30am local time, lasted until 10am, eating some ramen now to recover 😅

Very cool research made it into TruffleRuby!

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.

TruffleRuby kicks off the year with a new website, a new release, and a blog post to go with it! 🎉 truffleruby.dev/blog/truffle... Many changes: * New versioning * Thread-safe Hash * No system dependencies anymore * Installs in 2 seconds * Development is now fully in the open

Last year I had the pleasure to review and contribute to this paper by @ko1s.bsky.social: atdot.net/~ko1/activit... It's a tiny framework to partial evaluate AST interpreters written in C. The paper uses the example of a minimal subset of Ruby called naruby (Not A Ruby).

Had a good inspiring break? Tell us about your latest ideas on language implementations, compilers, and VMs: 2026.programming-conference.org/home/MoreVMs... Can be just a short abstract, or something slightly more technical if preferred. Deadline in about a week, Jan 12th.

Just merged a gargantuan PR: 340k lines & 3000 files changed, 128 comments 🎆🚀 It's the import of Ruby 3.4 in TruffleRuby: github.com/truffleruby/...

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...

#rubyrelease30th I’d like to introduce Aliki, RDoc and docs.ruby-lang.org’s new theme 😄 railsatscale.com/2025-12-22-i...

Finally, www.ruby-lang.org/en/ has a new design.

We were very proud to present @marcoroth.dev with the Rails Luminary Award 2025. And yes, I was on a secret mission to Zurich 😀. rubyonrails.org/2025/12/17/m...

I'm really happy to see @marcoroth.dev receive the 2025 Rails Luminary Award! 🎉 He’s done so much for the Rails ecosystem and the Ruby community. Huge congrats, Marco! 🙌 And it's great to have @fxn.bsky.social and @amandabrooke.bsky.social around. #rails #RubyOnRails #ReActionView #herb

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

concurrent-ruby 1.3.6 is released: github.com/ruby-concurr... It automatically prunes unused threads of a thread pool even when no new work is queued, migrates away from the deprecated "non-typed data" C API and includes several bug fixes.

Inverted Catenaries xkcd.com/3176/

If anyone is looking for an easy pure-Ruby contribution to TruffleRuby, here is one: github.com/truffleruby/...

It is time. I was going to hold off, release in bulk. When all were ready. Stina suggested an advent calendar. And I try to heed her wisdom. Goatcember begins! Marc Lainez gave us this fantastic start on his teams work on The Nerves Car. goatmire.bold.video/v/ywpqe #elixirlang

Extended an existing doc to explain Ruby’s VM stack, which I learned from my ZJIT work: docs.ruby-lang.org/en/master/co...

I'm making another attempt to get a `deep_freeze` method added to Ruby. Core folks have rejected proposals for years, until Ractor came along and we got basically the same feature in `make_shareable`. But deep freezing should be its own feature. bugs.ruby-lang.org/issues/21665

Announcing ractor-shim, a new gem that reimplements Ractor on top of Thread & Queue: github.com/eregon/racto... This gem provides the full Ruby 3.5 Ractor API (Ractor::Port, Ractor#{join,value,monitor}, etc) on TruffleRuby, JRuby, and CRuby 2.7 to 3.4.

pkl-lang.org migrated from a ANTLR parser to manual parser, result: twice as fast. From Islon Scherer at the #GraalVM Community Summit

I wrote about some of my thoughts on the lessons we can learn from the RubyGems situation and how we can move forward. blog.peterzhu.ca/open-source-...

Can We Know Whether a Profiler is Accurate? Spoiler: yes we can! But it took us figuring out a way to work around the fundamental observer effect. stefan-marr.de/2025/10/can-... If you're at SPLASH, don't miss our talk at VMIL today and at OOPSLA on Saturday!

I tried to explain why I don't believe the recent accusations toward my former teammates, as well as how the Ruby and Rails Infra team at Shopify operates and why it can be trusted. byroot.github.io/opensource/r...