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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

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