Benoit Daloze

I also wrote a post for work with an intentionally rage bait title. Hello compiler friends I'm sorry in advance railsatscale.com/2026-10-21-r...

ZJIT is now as fast as YJIT: railsatscale.com/2026-10-09-z...

« If your question is "which Ruby runs my Rails app fastest without changing a line of it," the answer here is TruffleRuby, and it isn't close. » From intertwingly.net/blog/2026/09... by @intertwingly.net. Context: Puma with 1 process and 5 threads serving a simple Rails blog app.

I had a great time at #EuRuKo 2026 in Brno, an amazing single-track program, many new #RubyFriends, easy to get to and no jet lag, very walkable city, everything incl. food & even karaoke available at the venue. I wanted more karaoke so I organized a second one and it was a lot of fun!

Here are the slides for my talk "Running Native Extensions and Ruby Code in Parallel Threads" at #EuRuKo 2026: eregon.me/blog/assets/...

TruffleRuby runs Doom at, 🥁, 662 FPS! From the talk of @khasinski.bsky.social at #EuRuKo

"A language that is kind to humans is kind to AI too" Matz at #EuRuKo

So Matz is saying you can make Campfire (a Rails app) 5 times faster and use a twelvth of the memory by using github.com/rubys/roundh... + github.com/matz/spinel

So part of the reason for Spinel (AOT compiler from Ruby to C) is lower memory usage, because RAM got expensive, and of course performance #EuRuKo

"When I created Ruby 33 years ago" Matz at #EuRuKo

GraalVM 25.3 is here!🎉 It brings performance and security improvements, along with updated language runtimes 🚀 Learn more: medium.com/graalvm/graa... Download: www.graalvm.org/downloads/

This is how we made bytecode interpreters in Java competitive with state of the art assembly tuned C interpreters. They partially evaluate like Truffle interpreters at the same time! Integrated in GraalPy, GraalWasm and Crema! Soon in GraalJS! Great work by Yudi Zheng!

Escaping the Giant Switch: a deep dive into optimizing bytecode interpreters: medium.com/graalvm/esca...

A history of Ruby's Hash tables, and how we can make them use less memory: byroot.github.io/ruby/perform...

While it has been 18 months since I blogged about it, the json gem performance has improved quite significantly since, so now is a good time to add a few more parts to my JSON serie: byroot.github.io/ruby/json/20...

Excited to speak at @euruko.org this year, see you in Brno in September! 2026.euruko.org

Just shipped my first release of the datadog gem! github.com/DataDog/dd-t...

concurrent-ruby 1.3.7 is released and fixes 3 security vulnerabilities: github.com/ruby-concurr...

While his mountain of horrible personal conduct could fill multiple books, one fact in particular stands out: A year ago, Musk’s actions directly led to the deaths of hundreds of thousands of people. He did it knowingly. And, worse — gleefully. Read more: www.theverge.com/tech/949259/...

I realized it has been ~1.5 years since I concluded my series of post on JSON optimization. So I got curious how much faster it became since then. 2.7.2 was the last version before I took over maintainership. 2.9.0 was the version I released at the end of the blog series.

Inlining: the hard parts bernsteinbear.com/blog/inlinin...

You know it's going well when typing 'github' in my browser has www.githubstatus.com as the first suggestion ...

New linear scan register allocator in ZJIT by @tenderlove.dev ! railsatscale.com/2026-05-27-a...

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.

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...

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

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

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...