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Re:Substrate VM – A framework that allows AOT compilation of... by danjoc on Thursday January 04, 2018 @04:53PM (#16074410)
What's the difference between substrate vm and jaotc?

https://mjg123.github.io/2017/10/02/JVM-startup.html

Substrate VM is more mature? jaotc was response to closed Substrate VM?

Re:Substrate VM – A framework that allows AOT compilation of... by lewurm on Thursday January 04, 2018 @04:56PM (#16074440)
`jaotc` integrates with the HotSpot VM, while Substrate VM provides its own runtime (GC etc.) and intentionally supports only a subset of the JVM features.

FWIW, both use Graal as a compiler.