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YJIT: Update yjit.md about mem size (#9687)

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Takashi Kokubun 2024-01-24 10:26:57 -08:00 committed by GitHub
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@ -243,8 +243,8 @@ which often consumes more memory than JIT code. Generally, YJIT adds memory over
3-4x of `--yjit-exec-mem-size` in production as of Ruby 3.3. You should multiply that by the number
of worker processes to estimate the worst case memory overhead.
We use `--yjit-exec-mem-size=64` for Shopify's Rails monolith, which is Ruby 3.3's default,
but smaller values like 32 MiB or 48 MiB might make sense for your application.
`--yjit-exec-mem-size=48` is the default since Ruby 3.3.1,
but smaller values like 32 MiB might make sense for your application.
While doing so, you may want to monitor `RubyVM::YJIT.runtime_stats[:ratio_in_yjit]` as explained above.
### Enabling YJIT lazily