D outperformed by C++, what am I doing wrong?

[Johan Engelen via Digitalmars-d-learn]

On Sunday, 13 August 2017 at 09:15:48 UTC, amfvcg wrote:
>
> Change the parameter for this array size to be taken from stdin 
> and I assume that these optimizations will go away.

This is paramount for all of the testing, examining, and 
comparisons that are discussed in this thread.
Full information is given to the compiler, and you are basically 
testing the constant folding power of the compilers (not 
unimportant). No runtime calculation is needed for the sum. Your 
program could be optimized to the following code:
```
void main()
{
     MonoTime beg = MonoTime.currTime;
     MonoTime end = MonoTime.currTime;
     writeln(end-beg);
     writeln(50000000);
}
```
So actually you should be more surprised that the reported time 
is not equal to near-zero (just the time between two 
`MonoTime.currTime` calls)!

Instead of `iota(1,1000000)`, you should initialize the array 
with random numbers with a randomization seed given by the user 
(e.g. commandline argument or stdin). Then, the program will 
actually have to do the runtime calculations that I assume you 
are expecting it to perform.

- Johan