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I’ve wondered Why Rails becomes slow with JIT for a long time. Today, I’m pleased to share my answer to the question in this article, which I spent three years of my life to figure out. RubyKaig 2018 / The Method JIT Compiler for Ruby 2.6"MJIT Does Not Improve Rails Performance"As I wrote in Ruby 3.0.0 Release Note and my previous post, we thought: it is still not ready for optimizing workloads li

TL;DRRuby 3.0 JIT is the fastest JIT ever for MRI. However, despite Ruby 3.0's big improvement in reducing i-cache misses, it's still not ready for optimizing Rails applications. Stay tuned for Ruby 3.1. "Is Ruby 3 Actually Three Times Faster?"Ruby 3 is indeed 3x faster than Ruby 2.0 in a Ruby 3x3 benchmark, Optcarrot: https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/As proposed by

TL;DRWe focused to improve Rails application performance in Ruby 2.7 JIT, but the last year's assumption was wrong and Ruby 2.7 JIT didn't meet the goal. We'll change the approach for it in Ruby 3.0. Ruby 2.7 is released!Merry Christmas! The new Ruby is out. As I've sometimes promised to make performance improvements in Ruby 2.7 JIT, let me explain how it went. See also The method JIT compiler for

My benchmark tool development was accepted as a Ruby Association Grant 2017 project and completed on March 21st. I’ll show you the details of the project. benchmark_driver.gem's example usage that outputs a graph: Project SummaryHere is a copy of the project summary which I sent to Ruby Association: This project aims to improve benchmark_driver.gem, which is built to compare performance of differe

This month, I merged the Ruby's first JIT compiler. As it isn't ultra-fast yet, I haven't shared it deeply until the conference. But some of you guys kindly wrote great articles about it. Playing with ruby's new JIT: MJITRuby's New JITProbably they are easier to understand than my article. But I found several things to point out or announce. So I decided to write this article. What's "MJIT"?Let me