I never buy into the tech stack argument that things are being worked on (e.g you mention Project Vahalla but I see this across many languages and tools). Seen this argument used on a number of different technologies. It compares a future state to a current state to put the favored tech (the future state) in an equal or better position. It usually punishes innovative platforms as well; because it dismisses any reason to take them up.
It's comparing apples to oranges - in this case .NET is also being actively worked on so may have other things by then. Compare current state only.
The truth is each platform has prioritized features relevant to its context. For what its worth in my experience while the JVM has many more JIT optimisations and the like it tends to need them more of them given the lack of some of those features you mention (e.g. value types). Whereas .NET code allows value types, better management of memory (i.e. Span), reified generics etc so the focus has been to allow the user to optimise themselves where required where still allowing for a decent performance default. Many of the optimisations in the JVM wouldn't have the same bang for buck in .NET and vice versa.
On a personal note I'm more of a fan of the .NET philosophy because the code is usually fast enough, and when I need to tune memory, avoid allocations, and do fast code it seems to offer more tools not in an unsafe context to do so. It allows a better "upper bound" of performance for core things IMO while keeping to bytecode/IL. Many benchmarks where the same level of application optimisation has occured from what I seen have confirmed this bias for me. YMMV
You’re missing the point. He claimed Oracle refuses to develop these features or will sue you if you do it yourself (they hired the guy who implemented fibers to implement them in the jvm), but they are actively working on it. The point of my comment was that OP’s claim was just patently false. I wasn’t claiming the JVM has feature parity or is better or anything of the sort.
It's comparing apples to oranges - in this case .NET is also being actively worked on so may have other things by then. Compare current state only.
The truth is each platform has prioritized features relevant to its context. For what its worth in my experience while the JVM has many more JIT optimisations and the like it tends to need them more of them given the lack of some of those features you mention (e.g. value types). Whereas .NET code allows value types, better management of memory (i.e. Span), reified generics etc so the focus has been to allow the user to optimise themselves where required where still allowing for a decent performance default. Many of the optimisations in the JVM wouldn't have the same bang for buck in .NET and vice versa.
On a personal note I'm more of a fan of the .NET philosophy because the code is usually fast enough, and when I need to tune memory, avoid allocations, and do fast code it seems to offer more tools not in an unsafe context to do so. It allows a better "upper bound" of performance for core things IMO while keeping to bytecode/IL. Many benchmarks where the same level of application optimisation has occured from what I seen have confirmed this bias for me. YMMV