yjit VS Opal

Compare yjit vs Opal and see what are their differences.

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yjit Opal
9 32
588 4,771
3.7% 0.1%
5.0 0.0
25 days ago 5 days ago
Ruby Ruby
GNU General Public License v3.0 or later MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of yjit. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-11-09.
  • Ruby 3.1.0 Preview 1 released with new experimental JIT
    4 projects | news.ycombinator.com | 9 Nov 2021
    > I’m curious how the impact affects development, deployment, etc.

    YJIT is pretty much transparent in production, if not it's likely a bug.

    When we tried MJIT in production to compare it against YJIT, it causes lots of request timeouts on deploy, because the JIT warmup would take 10 to 20 minutes and it's much slower during that phase.

    But YJIT warms ups extremely fast and with a much lower overhead, it's seemless on deploy.

    The only thing you may need to tweak is `--yjit-exec-mem-size`, it defaults to `--yjit-exec-mem-size=256` (MB) which is not quite enough for larger apps.

    As for development, it would work, but with code reloading enabled, you'd likely exhaust the executable memory allocation pretty fast, because for now YJIT doesn't GC generated code [0]. It will come soon, hopefully before the 3.1.0 release, but that's one of the reason why it's not enabled by default.

    [0] https://github.com/Shopify/yjit/issues/87

  • YJIT: Building a New JIT Compiler for CRuby
    3 projects | /r/ruby | 15 Oct 2021
    Just want to temper expectations because YJIT is still new. But if you run into crashes or bugs, please open an issue with as much detail as you can: https://github.com/Shopify/yjit
  • Sorbet Compiler: An experimental, ahead-of-time compiler for Ruby
    2 projects | /r/programming | 1 Aug 2021
    You raised a point that the compiler only does a subset. That's actually what I would expect from a new project. I don't expect a full implementation to start. It takes time for a compiler to be mature enough to be general purpose. Here is another Ruby compiler in its infancy: https://github.com/Shopify/yjit.
  • YJIT: Building a New JIT Compiler Inside CRuby
    3 projects | /r/ruby | 2 Jun 2021
    We allocate our own chunk of executable memory and append/rewrite the end of it as we compile new blocks. We have our own in-memory assembler that's implemented here. It's x86 only right now, totally not portable, but over the course of the summer we're going to work on a backend that can open up the possibility of ARM64 support and some lower-level optimizations.
    3 projects | /r/ruby | 2 Jun 2021
    Yes. I put some suggestions here. I realize that not all of them are practical, but refactoring specific hot methods could make a difference.
    3 projects | /r/ruby | 2 Jun 2021
    Yes we are in touch with the Ruby core devs. They seem open to collaborating. k0kubun (working on MJIT) has contributed to the project: https://github.com/Shopify/yjit/pull/60


Posts with mentions or reviews of Opal. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-06-22.

What are some alternatives?

When comparing yjit and Opal you can also consider the following projects:

Ruby on Rails - Ruby on Rails

MRuby - Lightweight Ruby

JRuby - JRuby, an implementation of Ruby on the JVM


ruby - The Ruby Programming Language

Rubinius - The Rubinius Language Platform

vox - Vox language compiler. AOT / JIT / Linker. Zero dependencies

natalie - a work-in-progress Ruby compiler, written in Ruby and C++

ruby.wasm - ruby.wasm is a collection of WebAssembly ports of the CRuby.

rhizome - A JIT for Ruby, implemented in pure Ruby

tensorflow-ruby - Deep learning for Ruby