Code runtime

[Ausprobierer via Digitalmars-d]

On Sunday, 5 June 2016 at 21:58:46 UTC, Donald Drumpf wrote:
> On Sunday, 5 June 2016 at 21:52:20 UTC, Ausprobierer wrote:
>> I've written this simple piece of code:
>>
>> [CODE]
>> import std.algorithm;
>> import std.array;
>> import std.conv;
>> import std.datetime;
>> import std.parallelism;
>> import std.range;
>> import std.stdio;
>> import core.atomic;
>> import core.thread;
>>
>> [...]
>
> How many times did you run each? A single run isn't ever really 
> useful. Also, not sure if this would account for the drastic 
> difference, but declare long Z[] in global scope over in local 
> scope might have some impact.
>
> If I wrote this, it would be faster, I guarantee it.

With

[CODE]
import std.algorithm;
import std.array;
import std.conv;
import std.datetime;
import std.parallelism;
import std.range;
import std.stdio;
import core.atomic;
import core.thread;

long[] z = [1,1,2,2,3,3,4,4,5,5,6,6,0,0];

void main()
{
     immutable long n = 11;

     long l = z.length;
     long j = 0;
[...]
[/CODE]

and "dmd -m64 -O -inline -release <filename>.d" I still get 40 
seconds runtime.