> Plus, they're not portable, even if you get the timing right now, it won't work on the next generation of the microprocessor or on a slightly different memory

> Plus, they're not portable, even if you get the timing right now, it won't work on the next generation of the microprocessor or on a slightly different memory subsystem. You might be able to tune it just right on your desktop, but it probably won't work as well on your laptop, and it certainly won't work as well on a cluster I think using Java or any other JIT system will solve this problem.