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.

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

I really shouldn't be sharing teasers given how much work's left to do, and the good chance that this becomes another forgotten experiment, but I'm pretty happy with how far I got with barely any tuning (compared to the 20-year battle-tested Puma, which I've taken some inspiration from <3). 1/5

Announcing RactorPool: github.com/joshuay03/ra... Extracted from a project I'm building with Ractors. Currently requires Ruby 3.5 (3.5.0.dev). Goal is to have it stable for Ruby 4.0, when Ractors will be less experimental 🤞🏽

I'm building something with Ractors and found a bug. Tried my best™️ to fix it: github.com/ruby/ruby/pu... Side note: Might just be me, but as a non-frequent contributor, building ruby/ruby and running tests seems to be much more convenient and efficient than it was a couple years ago.

September flew by pretty quickly… I kicked it off by attending #RailsWorld! www.linkedin.com/posts/joshua...

I’ve added support for distributed deployments: github.com/joshuay03/di... Couple of ideas to follow up on: - Profile dashboard - Profile comparisons

Satisfying memory and CPU improvements after enabling Puma preloading + Process.warmup on one of Buildkite's services (our agent shard). Just rolled this out to all services - keen to see the broader impact!

I wrote (or rewrote) some gems to get better at Ruby C extensions and learn about these topics (CAS and mmap): - github.com/joshuay03/at... - github.com/joshuay03/mm...

I'm curious about this too. With YJIT in maintenance mode, bug fixes, UX improvements, etc., are probably welcome (a colleague recently found and fixed one). But with ZJIT being greenfield WIP, I'm not so sure. Completely understandable if that's the case though.

Had a blast at #RubyKaigi 2025! www.linkedin.com/posts/joshua...

#RubyKaigi late night with #RubyFriends !

Announcing Dial, a Rails application profiler: github.com/joshuay03/dial I've longed for a free tool that provides Datadog-like profiles, with accurate GVL and GC activity. Thanks to @jhawthorn.com's amazing work on Vernier, all I needed to do was integrate it with Rails and let it do its thing.

Random thought about Ruby thread scheduling fairness that I don't have sufficient knowledge of the VM to answer myself—without probably banging my head against a wall for a couple of days or weeks 🧵

#24 of 564 contributors to Rails last year—not too shabby for mostly working on OSS in my free time! Hoping to keep the momentum going in 2025 🚀 contributors.rubyonrails.org/contributors...