C++ vs. Java (speed considerations only)

[JamesTerm]

Originally Posted by drakesword

I agree with you on the first part. The second part I very muc disagree with the MB's of data. I work for a company that does e-discovery. Our main processing system is entirely java. It is able to process Almost 100gb per hour depending on the media. Just today we processed 1.2GB of mail storage in 45 seconds.

How do you define processing? Any language can do simple tasks like data transfer with simple logic instructions... but its another thing where you really process the data that requires inner loops (e.g. 3d rendering, Audio/Video effects processing). With c++ you can use inline assembly and use intrinsics that explicitly choose what assembly instructions to use. You can for example do prefetching to ensure the P and V pipes are always full in an inner loop. Back in the eary 2000-2004ish... we also had to be responsible for scheduling instructions to ensure that we didn't get penalized for branch predictions failing, or put two divides too closely together by squeezing in some lightweight instructions like 'and', 'or', or even adds, or ensure we cycled through each mmx/sse instruction register (it was crazy). Around 2005-2008 Visual Studio mastered the intrinsics to have a competitive optimization of the instruction scheduling. Furthermore you can do things like this http://www.jaist.ac.jp/iscenter-new/...2_hh/vc235.htm. Really now... when you speak of real processing power, consider what language they used to land the Mars Curiosity Rover.