Re: I'm Shocked

From:
"Alf P. Steinbach" <alfps@start.no>
Newsgroups:
comp.lang.c++
Date:
Sat, 03 Mar 2007 11:24:45 +0100
Message-ID:
<54t0jjF211mpfU1@mid.individual.net>
* Bas:

Hello,

Until 6 years ago I was a C++ programmer. The last 6 years I've done
something else than computerprogramming, but now I'm a bit back, learning
myself C#.
I cannot resist sometimes to compare these two languages (as far as I can,
not programming for 6 years is quitte a time),
so I had to try the speed of both: allocate 30,000,000 objects of a class,
and clocking the time necessary.
Here is the code for C#:

namespace Temp
{
  class Program
  {
    static void Main(string[] args)
    {
      DateTime t1 = DateTime.Now;
      Test[] tab = new Test[30000000];
      for (long i = 0; i< 30000000; i++) {
        tab[i]=new Test();
      }
      DateTime t2 = DateTime.Now;
      Console.Write("Begin time is {0}:{1}:{2}:{3}\n", t1.Hour, t1.Minute,
t1.Second, t1.Millisecond);
      Console.Write("End time is {0}:{1}:{2}:{3}\n", t2.Hour, t2.Minute,
t2.Second, t2.Millisecond);
      Console.Read();
    }
  }

  class Test{
    private int i;
    private double d;
    private float x;

    public Test(){
      i=123;
      d=3.1415926;
      x=6.28f;
    }
  }
}

and here it is for C++:

#include "stdafx.h"
#include <windows.h>

class Test {
private:
   int i;
   double d;
   float fl;

public:
 Test() {i = 123; d = 3.1415926; fl = 6.28f; }
};

int _tmain(int argc, _TCHAR* argv[])
{
 SYSTEMTIME startingtime, endtime;

 GetLocalTime(&startingtime);

 Test *ar[30000000];
 for(long int j = 0; j< 30000000; j++)
    ar[j] = new Test;

 GetLocalTime(&endtime);

 printf("%2d:%2d:%2d:%2d\n",startingtime.wHour,startingtime.wMinute,startingtime.wSecond,startingtime.wMilliseconds);printf("%2d:%2d:%2d:%2d\n",endtime.wHour,endtime.wMinute,endtime.wSecond,.wMilliseconds); getchar(); return 0;}I hope someone will say "YOU MORON..!"and that I've done something wrong..But the C# program was ready within 11seconds.. the C++ program took 15seconds; so it was SLOWER.How can thisbe!?!?Kind regards,Bas from Holland


Doesn't look much like standard C++ to me.

Anyway, meaningless without knowing machine, OS, compiler, compiler
options etc.

Did you try

     #include <vector>

     class Test
     {
     private:
         int i;
         double d;
         float fl;

     public:
         Test() {i = 123; d = 3.1415926; fl = 6.28f; }
     };

     int main()
     {
         std::vector<Test> v( 30000000 );
     }

?

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