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digitalmars.D - For Leandro

reply bearophile <bearophileHUGS lycos.com> writes:
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
May 03 2009
next sibling parent reply Georg Wrede <georg.wrede iki.fi> writes:
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
May 03 2009
parent reply bearophile <bearophileHUGS lycos.com> writes:
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
May 03 2009
parent reply Georg Wrede <georg.wrede iki.fi> writes:
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.
May 03 2009
parent bearophile <bearophileHUGS lycos.com> writes:
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
May 03 2009
prev sibling parent Leandro Lucarella <llucax gmail.com> writes:
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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May 04 2009