@_byroot

Rails core, Ruby committer, Senior Principal Engineer at Intercom. Bsky: https://xitter.cf/t.co/05cdHJkcO4 Mastodon: @byroot@ruby.social

 Toulouse
github.com/byroot
Joined April 2022
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  • Followers4.8K
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Replying to @_byroot @lewispb @tobscher
- Boot time is a key metric for me. - Dependency on the DB during boot is also a no-no - Not sure it scales well on larger monoliths - I'm worried of maintenance cost.
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Replying to @_byroot @lewispb @tobscher
As for exercising codepaths during boot. That's something that has very often been opposed to me when reforking is mentioned. I've always been wary of it because:
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Replying to @lewispb @tobscher
Makes sense. Familiarity is definitely a great argument in my book.
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Replying to @tobscher @lewispb
Interesting. I wonder why you're sticking with Puma, and even go trough the trouble of patching it, if you run it single threaded? Why not just use Pitchfork at that point? (not saying this because I'm the author, I'm genuinely curious).
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Jean Boussier retweeted
rubyireland@rubyirelandAug 18
🚂 Ruby Ireland is back! Agents of Concurrency - September 10th at @fin_ai Jean Boussier makes the case for multiprocessing in Rails, while Ryan Sherlock gets into shipping AI agents on Rails - fast, repeatedly, and in production. Thx Fin! RSVP 👇 meetup.com/rubyireland/event…

Agents of Concurrency, Thu, Sep 10, 2026, 6:30 PM | Meetup

It's quite late in the year to be coming out of hibernation but if rarity makes a thing more precious then this event is surely is one heck of a valuable meetup. And indeed

meetup.com
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A quick followup on Ruby Hashes byroot.github.io/ruby/perfor…

Speeding Up (small) Ruby Hashes

Something I must confess is that I absolutely hate writing these blog posts. It’s not quite as bad as having to give a conference talk, but it’s up there on the list of activities that feel like...

byroot.github.io
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Replying to @watson1978
Yeah, I saw your issue, and I generally agree. But I changed the implementation several times, so not really in a rush to upstream it in Ruby, as just yesterday it seems another even faster one dropped vitaut.net/posts/2026/yy-dto…
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Replying to @_pleasework
Thank you. I'll start sending PRs to these project to unlock `json` 3.x
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Replying to @TechWithMatteo
99% of the changes are just removal of deprecated APIs, so I don't really expect bugs. #famouslastwords
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I'll probably release the final 3.0.0 version early September, so if you got time please try the RC1 and submit any feedback you may have: github.com/ruby/json/release…

Release v3.0.0.rc1 · ruby/json

With the removal of the insecure create_additions option, JSON.load and JSON.dump are now safe to use. Them being unsafe by default caused multiple security vulnerabilites in the past. If you did d...

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

Shrinking Ruby Hashes

As you may know, one area of Ruby performance optimization that particularly interests me is memory usage. Given that most Ruby deployments rely on fork, improving Copy-on-Write performance is...

byroot.github.io
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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 series: byroot.github.io/ruby/json/2…

Optimizing Ruby’s JSON, Part 8

It has now been about 18 months since I concluded my post series on optimising Ruby’s json.

byroot.github.io
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Replying to @jdxcode @nateberkopec
For the record the first name I reached to was forklift, but it was already taken.
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Replying to @matheusrich
A Rails app.
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Replying to @paracycle @Dagnan @vipulnsward
To be fair to this article, the very first version of "chilled strings" did return true when `frozen?` was called on it. It was changed a little bit after that post was published.
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Replying to @Dagnan
It's not, though. It's still opt-in even in 4.0.
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This one feels good. No more stupid comments at the top of files. At least in one repo.
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Replying to @marcoroth_
About the boot performance, as discussed in Hakodate, I'd be interested to look in what it would take to support precompiling templates with Bootsnap, making parsing performance less important.
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Jean Boussier retweeted
Hiroshi SHIBATA@hsbtApr 20
I wrote answer letter: github.com/ruby/rubygems/dis…

Proposal: override DSL in Gemfile for managing version constraints · ruby rubygems · Discussion...

Background In the discussion around #9454, reviewers (including @byroot and @Edouard-chin) pointed out that BUNDLE_IGNORE_RUBY_UPPER_BOUNDS and BUNDLE_IGNORE_RUBYGEMS_UPPER_BOUNDS should be express...

github.com
Jean Boussier@_byrootApr 20
I wrote some more as a way to fight jet lag, hopefully it's still readable 😅: byroot.github.io/ruby/bundle…

The Missing Bundler Features

Over the last few months, there has been a lot of talk about making Bundler faster, both by improving it directly, or by reimplementing it in another language, and while it may surprise some, that...

byroot.github.io
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Replying to @_byroot @samsaffron
And right now we have no way to specify that in the gemspec, all we can do is raise in your face during boot, which isn't ideal.
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