> It's an important constituent, but only complete OS-emulation with deterministic scheduling could (at a huge overhead) This does actually exist; check out an

> It's an important constituent, but only complete OS-emulation with deterministic scheduling could (at a huge overhead) This does actually exist; check out antithesis's product. I'm not sure how much is public information but their main service is a deterministic (...I'm not sure to what extent this is true, but that was the claim I heard) many-core vm on which otherwise difficult testing scenarios can be reproduced (clusters, databases, video games, maybe even kernels?) to observe bugs that only arise in extremely difficult to reproduce circumstances. It does seem like overkill just to get a marginally more reproducible build system, though.