Ruby 再引入另外一套 JIT 實做：RJIT
source link: https://blog.gslin.org/archives/2023/03/10/11090/ruby-%e5%86%8d%e5%bc%95%e5%85%a5%e5%8f%a6%e5%a4%96%e4%b8%80%e5%a5%97-jit-%e5%af%a6%e5%81%9a%ef%bc%9arjit/
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Ruby 再引入另外一套 JIT 實做：RJIT
在 Hacker News Daily 上看到「RJIT #7448」這個，Ruby 上一套新的 JIT 實做。
這次的 RJIT 取代掉先前的 MJIT：
This PR replaces the current implementation of MJIT with a new JIT called "RJIT"
有些特點，其中一個是 RJIT 在 buildtime 與 runtime 都不需要 compiler，這是因為 RJIT 直接用 Ruby 實做：
RJIT uses a pure-Ruby assembler to generate native code
- MJIT requires a C compiler at runtime. YJIT requires a Rust compiler at build time. RJIT doesn't require them.
- This means that RJIT's warmup could be slower than YJIT, but it's still much faster than MJIT's.
另外值得注意的是，RJIT 的作者 k0kubun 跟 YJIT 的作者 Maxime Chevalier-Boisvert 都是 Shopify 的員工，可以看出 Shopify 對於 Ruby 效能的痛？決定直接自己養人改善效能。
回到 RJIT 這邊跑的測試，可以看到他是用 YJIT 的測試套件測，這也就不會太奇怪了。
跟這次取代掉的 MJIT 相比，RJIT 在 Headline 這包測試都 OK，在 Other 這包則是有來有回，而在 Micro 這包則是有不少項目輸掉 (相比於前兩者)：
這樣整體看起來算是有進步，下一版 Ruby 更新應該就會有了。
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