Another small one for Leandro Lucarella:

struct S { int a;  S* p; }
void main() {
  foreach (ref s; new S*[4_000_000])
    s = new S;
}

Timings N=4_000_000, best of 3, seconds:
  D1: 2.47
  D2: 2.68

On WinXp, Core2 2 GHz, last DMD1 and DMD2.
In future I may use private email instead.

Bye,
bearophile

bearophile wrote:
> Another small one for Leandro Lucarella:
> 
> struct S { int a;  S* p; }
> void main() {
>   foreach (ref s; new S*[4_000_000])
>     s = new S;
> }
> 
> Timings N=4_000_000, best of 3, seconds:
>   D1: 2.47
>   D2: 2.68
> 
> On WinXp, Core2 2 GHz, last DMD1 and DMD2.

Fedora-10, Core2 Quad, 2.4GHz, last DMD2,
dmd -release -O :
real	0m2.398s
user	0m2.337s
sys	0m0.061s

Georg Wrede:
> Fedora-10, Core2 Quad, 2.4GHz, last DMD2,
> dmd -release -O :
> real	0m2.398s
> user	0m2.337s
> sys	0m0.061s

Thank you for your timing. It is consistent with the my time.
But the purpose of my little test was to show that for little benchmark there's a performance decrease between D1 and D2 (probably because of the GC). So can you show the timing for D1 too on the same machine of yours?

Bye,
bearophile

bearophile wrote:
> Georg Wrede:
>> Fedora-10, Core2 Quad, 2.4GHz, last DMD2,
>> dmd -release -O :
>> real	0m2.398s
>> user	0m2.337s
>> sys	0m0.061s
> 
> Thank you for your timing. It is consistent with the my time.
> But the purpose of my little test was to show that for little
> benchmark there's a performance decrease between D1 and D2 (probably
> because of the GC). So can you show the timing for D1 too on the same
> machine of yours?

real	0m2.218s
user	0m2.169s
sys	0m0.047s

This is best of three. But I'm convinced there's too much variation with best of three. Middle of ten would be somewhat better.

Georg Wrede:
> real	0m2.218s
> user	0m2.169s
> sys	0m0.047s

Thank you. Such results are in line with mine. Leandro will like that.

> This is best of three. But I'm convinced there's too much variation with best of three. Middle of ten would be somewhat better.

I agree. I usually time things more than three times, but three is the minimum :-)

Bye,
bearophile

bearophile, el  3 de mayo a las 15:03 me escribiste:
> Another small one for Leandro Lucarella:
> 
> struct S { int a;  S* p; }
> void main() {
>   foreach (ref s; new S*[4_000_000])
>     s = new S;
> }

Thanks! =)

-- 
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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