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I was discussing neural networks (NN) with a friend over lunch the other day and he claimed the the performance of a NN written in Java would be similar to one written in C++. I know that with ‘just in time’ compiler techniques Java can do very well, but somehow I just don’t buy it. Does anyone have any experience that would shed light on this issue? This page is the extent of my reading on the subject.
The Hotspot JIT can now produce code faster than C++. The reason is run-time empirical optimization.
For example, it can see that a certain loop takes the ‘false’ branch 99% of the time and reorder the machine code instructions accordingly.
There’s lots of articles about this. If you want all the details, read Sun’s excellent whitepaper. For more informal info, try this one.