Benchmarking Java programs

Question

For university, I perform bytecode modifications and analyze their influence on performance of Java programs. Therefore, I need Java programs---in best case used in producti

Answer 1

Any experienced programmer will tell you that premature optimisation is worse than no optimisation. It's a waste of resources at best, and a source of infinite future (and current) problems at worst.

Without context, any application, even with benchmark logs, will tell you nothing. I may have a loop in there that takes 10 hours to complete, the benchmark will show it taking almost forever, but I don't care because it's not performance critical. Another loop takes only a millisecond but that may be too long because it causes me to fail to catch incoming data packets arriving at 100 microsecond intervals.

Two extremes, but both can happen (even in the same application), and you'd never know unless you knew that application, how it is used, what it does, under which conditions and requirements.

If a user interface takes 1/2 second to render it may be too long or no problem, what's the context? What are the user expectations?