YJIT 帶給 Ruby 大量的效能提昇

Hacker News 首頁上看到的消息,由 Shopify 贊助的 YJIT 被 Ruby 官方接受了:「Merge YJIT: an in-process JIT compiler (github.com/ruby)」。

YJIT currently provides average speedups of 23% over the CRuby interpreter on realistic benchmarks, and near-instant warm-up time.

實做 YJIT 的 Maxime Chevalier-Boisvert 在他自己的 blog 上有提到這次的實做:「YJIT: Building a New JIT Compiler Inside CRuby」,裡面選擇的方法是他的 PhD 論文:「Simple and Effective Type Check Removal through Lazy Basic Block Versioning」。

可以看到在六月寫文章的時候,改善其實還沒這麼大,而且作者提到有不少可以再提昇的空間:

That being said, according to our benchmarks, we’ve been able to achieve speedups over the CRuby interpreter of 7% on railsbench, 19% on liquid template rendering, and 19% on activerecord.

Currently, only about 50% of instructions in railsbench are executed by YJIT, and the rest run in the interpreter, meaning that there is still a lot we can do to improve upon our current results.

本來的 MJIT 看起來會慢慢淡出...

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