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RUBYLAND0 Hot0 comments9 min read
What a JIT Can't Know
A deep technical comparison examines why Roundhouse, a tool that reads a Rails application and transpiles it to plain Ruby ahead of time, beats both YJIT and ZJIT on the Lobsters Rails benchmark by over 4x, and why the gains multiply rather than overlap. The piece profiles where time goes in Rails versus Roundhouse's output (SQL statement preparation, Active Record overhead, routing/dispatch, allocations) and argues that a JIT can only make existing work cheaper per instruction, while a whole-application specializer like Roundhouse can decide some work doesn't need doing at all (static SQL, fixed relations, preload trees, callback resolution). It also shares early results from Roundhouse's new 'futamura' target, which keeps real Active Record objects and gems intact while statically specializing what it can prove, estimating a 2.5-3x ceiling for that approach versus 4x for full lowering.
Source: https://intertwingly.net/blog/2026/10/11/What-a-JIT-Cant-Know.html. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.
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