[mike_hearn]

Yes but in this case the TruffleRuby approach would fix the Shopify issue, I think? And if by downside you mean longer warmup times that's an issue for YJIT or any other JIT too, so how much of a downside it is depends a lot on the nature of the deployment.

[byroot]

Shopify bigger repos are deployed pretty much every 30 minutes. As you point out most JITs struggle in these conditions.

But YJIT warms up extremely fast, and is able to provide real world speedup to these services almost immediately.