How to tune numerical D? (matrix multiplication is faster in g++ vs gdc)

[John Colvin]

On Monday, 4 March 2013 at 04:15:41 UTC, bearophile wrote:
> John Colvin:
>
>> First things first:
>> You're not just timing the multiplication, you're timing the 
>> memory allocation as well. I suggest using 
>> http://dlang.org/phobos/std_datetime.html#StopWatch to do some 
>> proper timings in D
>
> Nope, what matters is the total program runtime.
>
> Bye,
> bearophile

The performance of the multiplication loops and the performance 
of the allocation are separate issues and should be measured as 
such, especially if one wants to make meaningful optimisations.