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@rails @Shopify @ruby @pry @sparklemotion @TEAMBUTT

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jhawthorn/README.md
🌐
jhawthorn.com		 🐦
@jhawthorn		 📧
john@hawthorn.email

👋 Hi! I'm John Hawthorn

I'm a staff software engineer on the Ruby Architecture team here at GitHub :octocat:.

I'm a 💎 Ruby committer and on the 🚋 Rails core team. I like to spend as much time as possible working on performance. Hopefully I've made your code run faster too 🤗

A few Ruby projects I've made:

  • 📏 vernier is a next-generation Ruby profiler
  • 🏎️ rapidjson is a fast JSON parser/serializer (based on the C++ RapidJSON library)
  • 🗑 discard provides a simple soft-delete pattern for ActiveRecord.
  • 🏗️ actionview_precompiler eager loads view templates at boot (really this should be upstreamed into Rails)
  • 🐑 sheap is a tool to analyze Ruby heaps
  • 🍔pub_grub is a Ruby port of Natalie Weizenbaum's PubGrub CDCL-based version solving algorithm, as used by bundler
  • 📧dkim is a Ruby implementation of email DKIM signiatures

Some of my non-ruby open source projects:

  • 🔍 fzy is a fast and simple fuzzy text finder for the terminal. I wote fzy wanting a faster and more consistent algorithm than was available at the time, other tools have since adopted my algorithm. Fun fact: If you press t to find files in a GitHub repo that's fzy!
  • 🖼️ meh is a fast image viewer for X11 using raw XLib.

I dabble in electronics ⚡:

Pinned Loading

  1. vernier Public

    📏 next generation CRuby profiler

    Ruby 971 24

  2. fzy Public

    🔍 A simple, fast fuzzy finder for the terminal

    C 3.1k 131

  3. ruby/ruby Public

    The Ruby Programming Language

    Ruby 22.5k 5.4k

  4. rails/rails Public

    Ruby on Rails

    Ruby 56.7k 21.8k

  5. discard Public

    🃏🗑 Soft deletes for ActiveRecord done right

    Ruby 2.2k 86

  6. rapidjson-ruby Public

    A fast JSON library for Ruby

    Ruby 56 6

1,373 contributions in the last year

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Activity overview

Contributed to jhawthorn/vernier, rails/rails, jhawthorn/dotfiles and 46 other repositories
Loading A graph representing jhawthorn's contributions from April 14, 2024 to April 14, 2025. The contributions are 76% commits, 11% pull requests, 11% code review, 2% issues.

Contribution activity

April 2025

Created 6 commits in 3 repositories

Created a pull request in ruby/ruby that received 1 comment

Remove rb_gc_start from cancel_single_ractor_mode

In 307732c Ractors were changed to explicitly run GC when the first non-main one was activated in order to disable the transient heap. Theap no lon…

+1 −11 lines changed • 1 comment
Opened 2 other pull requests in 1 repository
ruby/ruby 2 merged
Reviewed 1 pull request in 1 repository
ruby/ruby 1 pull request
2 contributions in private repositories Apr 3 – Apr 7
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