Progress

Couldn't load this source. The model specs run Lobsters’ own tests against the emitted Ruby; the report has the latest result.

A fixed Lobsters snapshot, replayed on Rails and on the compiled app. Rails is the reference. No compiled configuration completed the latest run, so route agreement is unknown.

• Rails · YJIT✕ Stopped at bundle

  bundle not installable in ruby-bench/benchmarks/lobsters

  Reference

• Rails · no JIT✕ Stopped at bundle

  bundle not installable in ruby-bench/benchmarks/lobsters

  Reference

• Roundhouse · YJIT✕ Stopped at replay

  roundhouse: ingest ruby-bench/benchmarks/lobsters: unsupported construct in ruby-bench/benchmarks/lobsters/config/application.rb: config.load_defaults must name a literal version to determine JSON es…

  Unavailable: the replay didn't complete

• Roundhouse · no JIT✕ Stopped at replay

  roundhouse: ingest ruby-bench/benchmarks/lobsters: unsupported construct in ruby-bench/benchmarks/lobsters/config/application.rb: config.load_defaults must name a literal version to determine JSON es…

  Unavailable: the replay didn't complete

• Roundhouse · AOT✕ Stopped at emit

  roundhouse: ingest ruby-bench/benchmarks/lobsters: unsupported construct in ruby-bench/benchmarks/lobsters/config/application.rb: config.load_defaults must name a literal version to determine JSON es…

  Unavailable: the replay didn't complete

• Futamura · YJIT✕ Stopped at bundle

  bundle not installable in ruby-bench/benchmarks/lobsters

  Unavailable: the replay didn't complete

Recorded route gaps 2

• /hottestthis snapshot's Story#as_json serializes a nested record (`submitter_user: user`), which the render-json monomorphizer declines, so the emit answers this route with its html armLedger: in progress

  config/routes.rb pins `get "/hottest" => "home#index", :format => "json"`, so Rails serves JSON here and the AOT lane serves the HTML page. The respond_to flattening ledgers the dropped arm as a lower_residue warning (src/lower/controller/body.rs). Current upstream lobsters, whose Story#as_json writes `submitter_user: user.username`, is monomorphized end to end (src/lower/as_json_poro.rs, as_json_writer.rs).

  What closes it: nested-record encoding: Story's writer calling User's, where User#as_json is the attrs + super(only:) idiom with four row-dependent keys, a pluck, and keybase_signatures (an Array of Hashes, which needs its own encoding) In the ledger since 2026-08-03.

  Search for related workChanging the compiler

• /u/:usernameMarkdowner.to_html is a raising facade -- the AOT tree ships no CommonMark rendererLedger: not started

  User#linkified_about renders markdown at REQUEST time, so unlike the markeddown_* columns it cannot be precomputed. The facade raises rather than returning wrong HTML, which is why this route answers 500 instead of a wrong 200.

  What closes it: a Commonmarker/Markly facade over an iterative Node#walk plus the DOM surgery Markdowner does (h1-h6 to strong, images to links, rel=ugc, @mention linkifier); scripts/markly-conformance already carries vectors generated from the real gem In the ledger since 2026-08-03.

  Search for related workChanging the compiler

Workload: frozen 114-visit sequence, in-memory, in-process, single-threaded.

Does each published archive start and serve? 7 of 7 selected checks passed. These are smoke checks: they don’t measure all of Rails, or everything an app does.

Blog

• ✓ JRuby: Passed
• ✓ Ruby: Passed
• ✓ Rust: Passed
• ✓ Spinel: Passed
• ✓ TypeScript: Passed

Campfire

• ✓ Docker image: Passed
• ✓ Spinel: Passed

0532778

Generated Ruby serves the reference blog’s /articles at 10.0× the requests per second of Rails: CRuby + YJIT, one worker, median of 3 runs. Speed says nothing about parity.

Generated Ruby against Rails on the same runtime. Environment captured 8 Nov 2026 at add586f.

187 pull requests merged in 7 days, by 12 people; 1,330 in all. Merges measure activity; the app results above measure progress.

Welcome 11

11 people had their first pull request merged in the last 30 days.

• Animesh-Ghosh fix(ingest): walk the gems a Bundler path block lists8 Nov 2026
• aristotelesbr Spinel's boot.rb carries weakref and io/wait, which Spinel now has6 Nov 2026
• Hitoshi-Noborikawa valid? runs the validation callbacks (#1140)24 Oct 2026
• brodienguyen fix(ingest): keep columns with a named NOT NULL in structure.sql21 Oct 2026
• jonasporto Ingest the files config/application.rb loads with require_relative17 Oct 2026
• deepj An association build with an inline keyword hash emits the hash in braces17 Oct 2026
• dersam Freeze string literals in runtime Ruby and Spinel sources14 Oct 2026
• baron-hines Serialize ActiveJob payloads on the Ruby-family lanes (1/3): runtime11 Oct 2026
• iberianpig Walk the directories an app adds to config.autoload_once_paths11 Oct 2026
• andrzejkrzywda Preserve instance methods and keyword initializers in literal Data.define blocks10 Oct 2026
• Ahmad-Othman A model **kwrest beside a keyword stays a keyword rest9 Oct 2026

Merged work in 30 days 25

Alphabetical, never ranked.

Your first contribution doesn’t have to be a compiler patch.

• Set up a checkoutBuild Roundhouse and run the tests.
• Change the compilerWhere each stage lives, and its tests.

Search for related work, then share your reproducer on an existing or new issue, so two people don’t chase the same failure. Contributors talk in a chat room that runs on Campfire, compiled by Roundhouse on Spinel; once you’ve opened an issue or pull request, ask there for an invite.

Model examples are Lobsters’ own tests; the frozen replay is a recorded request workload; smoke checks start each published archive; benchmarks time one reference app. They test different things, so they aren’t added into one score, and none of them counts Rails features.

Smoke checks don’t measure all of Rails, or everything an app does; Rails coverage is the hand-kept feature map. Published without a named check: Blog: Rails source, Blog: Futamura, Blog: TypeScript, in a worker.

Release snapshots record dated claims; this page is rebuilt with the site.