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POIs there any real advantage from Bytecode JIT execution over native code beside portability? (General and OS-Design)
 

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  1. POIs there any real advantage from Bytecode JIT execution over native code beside portability? (General and OS-Design)
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    <p>Is there any real advantage from Bytecode JIT execution over native code beside possible implementation of platform independency?</p> <p>Apparently languages that use "virtual machines" over Bytecode JIT execution are attributed several advantages. But in what extend would this really affect a discussion concerning advantages/disadvantages of native code and JIT execution?</p> <p>Here's a list of attributes that I identify, the question is in what extend does this also apply to native code - if the compiler supports it...</p> <p><strong>Security</strong></p> <p>VM runtime environments can observe the running application for e.g. buffer overflows. </p> <ul> <li><p>So first question is if this is done by the "runtime environment", means e.g. by the class library or during JIT execution?</p></li> <li><p>Memory bounds-checking exist also for native code compilers. Any other/general restrictions here?</p></li> </ul> <p><strong>Optimization</strong></p> <p>Classical optimization should be possible in native code compilers, too. See LLVM which in fact uses the generated bitcode to run optimization on, before compiling to native code. </p> <ul> <li><p>Maybe there would be something like a dynamic optimization in JIT by e.g. identifying things to optimize related to the execution context. Could maybe be possible for a native compiler, too, to generate some code to optimize the execution during runtime. But dont't know if something like this is implemented.</p></li> <li><p>Popular VM implementations do this - the question is if this really excuses a real advantages over native code.</p></li> </ul> <p><strong>Threading</strong></p> <p>I don't cound this while threading also in a VM is dependent on the native Thread implementation of the OS.</p> <p>If we identify that there is no real advantage over native code and that there is always a runtime drawback in JIT... than this leads to the next question:</p> <p>Does an operating system design based on JIT execution (e.g. Singularity, Cosmos, ...) make sense?</p> <p>I could maybe identify one advantages: An OS with this design needs no MMU. Means there is no process seperation that makes use of the MMU, but a seperation between objects/components in software. But is it worth it?</p> <p>Best regards ;-)</p>
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    1. COAs for dynamic optimization by a native compiler: If the AOT compiler "generates some code to optimize the execution during runtime", you already have a JIT. And that JIT will sure as hell use a more high-level description of the program, because that's far easier to optimize. Have you tried inlining virtual calls given nothing but machine code (e.g. no information about classes)?
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    2. COGood objection.. So dynamic optimization and also GC are should be added to my list above. Think to answer it in detail it would need detailed measuring on current implementations...
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