jaeusm

Ajile Systems AJ-100 processor natively executes Java bytecode. Microcontrollers from Systronix, like the SaJe, use Ajile processors. They also use a modified version of the J2ME.

I used the SaJe to write a control system for an autonomous lawnmower when I was in grad school, and it performed quite well.

rsnd

I thought java code is translated to native machine code for some vms onloadtime? I think better speed can be achieved through algorithem optimization than making special hardware especially with java.

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Arevos

It's not that slow. It's just about the fastest VM-based language there is, and not an order of magnitude different from C++.

This is somewhat debatable, as freeing memory is not an inexpensive process, so it all depends whether your manual freeing of memory is more efficient than the GC's automatic system.

It's quite possible to outperform a GC with manual memory management, just as it's quite possible to outperform a compiler with manually written assembly. But it's not necessarily an easy or smart thing to try to do.

Compared to any common dialect of machine code, Java bytecode is relatively high-level, with concepts such as classes and interfaces being core concepts. You might get some speed increase by hard coding it, but I suspect a lot of the JVMs inefficiencies come from implementing high level functionality.

Honestly, an easier way to get rid of the VM would be just to compile the Java bytecode to machine code, which is what the GCJ project aims to do. Whether compiling results in faster applications, I'm not certain. It might be worth doing some benchmarks.

pushkarajthorat

I think i have cleared my views, thanks for contributing.

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[Pushkaraj]


Imagination is more important than knowledge – Albert Einstein

Harakim

This is kind of old, but I felt I should mention that they do have processors that run Java bytecode natively, and it was/is a good idea.

Second, Java is usually about as fast as c++, in spite of the incessant comments otherwise. There are, however, some things you just can't do quickly in Java.

ehm

Hi. I think with java's performane is everything is done, because, also there are jit compiler, which are for compiling java codes directly to native code. so I think there is no need, for creating additional CPU's processing byte-code. In any case, it depends of your project,or prog. taks, you could choose for example C/C++ for faster implementation