Re: Why use C++ instead of Java?

From:
SG <s.gesemann@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Sun, 6 Sep 2009 22:57:27 -0700 (PDT)
Message-ID:
<97242111-c093-4836-ad87-7d47f491a566@e8g2000yqo.googlegroups.com>
On 6 Sep., 18:48, Juha Nieminen <nos...@thanks.invalid> wrote:

SG wrote:

  sg@home:~/ccpp/perform$ time ./a.out

  real 0m0.972s
  user 0m0.776s
  sys 0m0.196s

  sg@home:~/ccpp/perform$ time java alloc

  real 0m4.130s
  user 0m4.516s
  sys 0m0.596s


  I assume you are not using gcc? Or you are using your own specialized
allocator?


I used GCC and no special allocator. To be specific:
G++ 4.3.3 versus Sun's HotSpot VM, Java 1.6.0_16
on a i686 Linux box running in 32bit mode.

alloc.cpp:
   int main()
   {
      const long count = 10000000;
      int** pp = new int*[count];
      for (long i=0; i<count; ++i) {
         pp[i] = new int(i);
      }
      for (long i=count-1; i>=0; --i) {
         delete pp[i];
      }
      delete[] pp;
   }

alloc.java:
   class alloc {
      static class intref {
         public int value;
         public intref(int v) { value = v; }
      };
      public static void main(String[] args) {
         int count = 10000000;
         System.out.println("h");
         intref[] ia = new intref[count];
         for (int i=0; i<count; ++i) {
            ia[i] = new intref(i);
         }
      }
   }

Cheers!
SG

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