Yes.

As big as you can. However, the judges do understand that the largest machines are difficult to get time on for this kind of activity.

Yes. In fact, higher level language submissions are strongly encouraged.

Yes. HPC Challenge Class 2 is 50% performance and 50% elegance which includes code size, readability, required effort and expertise of the implementation.

Yes. However, the judges are very interested in how your environment enables parallel computing, which includes how parallelism and data layout are expressed and used to implement HPC Challenge.

Yes.

No.

The relevant HPC Challenge code size are as follows (approximately):

Benchmark	HPL	RandomAccess	STREAM	FFT	PTRANS	DGEMM
Framework	2874	730	104	619	1131	66
Parallel	8800	938	329	787	1130	118
Serial	2109	125	329	747	105	118
Total	13783	1793	762	2153	2366	302

No. But having similar configuration and reporting capabilities is a plus.

For Class 1: no (if nothing has changed in your system since your previous submission). For Class 2: yes (even if nothing has changed from your previous submission).

In other words, winning submission in Class 1 from previous year is still a winning submission for this year's edition unless a better result is submitted or the system that achieved the winning result has changed. Last year's winning submission for Class 2 may win this year's competition but will not do it automatically, it has to be resubmitted.