Performance problems after porting to VS 2005 from 2003, native C++ code vs STL.

Performance problems after porting to VS 2005 from 2003, native C++ code vs STL.

• Joe Beam

  Thanks a lot Maks for taking the time to report the issue.
  
  I can see your bug link at http://lab.msdn.microsoft.com/productfeedback/viewfeedback.aspx feedbackid=f37af40d-e3c4-4a5c-a1f7-035895b5a8de.
  
  Please keep an eye on the link for future updates.
  
  Once more, it is great to have such feedback.
  
  Thanks,
    Ayman Shoukry
    VC++ Team
  
  

• Victor_123

  Thank you a lot for quick answer. I reported problem to your team as you asked. I didn't sent my code, because it will take a lot of time to make stand alone app. I used supplied in MSDN sample for push_heap function. And I saw the same problem, I acheaved 11 ms in 7.1 and 23 ms in 8.0.< xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

  Here is a simple code:

  
  int _tmain(int argc, _TCHAR* argv[]) {

  using namespace std;
  vector <int> v1, v2;
  vector <int>::iterator Iter1, Iter2;

  int i;

  CTimeCount timer;
  timer.Start();
  //Here I started my timer

  for ( i = 1 ; i <= 99999; i++ )
     v1.push_back( i );

  random_shuffle( v1.begin( ), v1.end( ) );

  int sum = 0;

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
     sum += *Iter1;

  // Make v1 a heap with default less than ordering

  make_heap ( v1.begin( ), v1.end( ) );

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
     sum += *Iter1;

  // Add an element to the heap

  v1.push_back( 10 );

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
     sum += *Iter1;

  push_heap( v1.begin( ), v1.end( ) );

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
     sum += *Iter1;

  // Make v1 a heap with greater than ordering

  make_heap ( v1.begin( ), v1.end( ), greater<int>( ) );

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
     sum += *Iter1;

  v1.push_back(0);

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
     sum += *Iter1;

  push_heap( v1.begin( ), v1.end( ), greater<int>( ) );

  for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )   
     sum += *Iter1;

  timer.Stop(); // and here the checked code ends

  cout << sum << "\n";

  cout << "Test Time:" << timer.GetElapsed() << "\n";

  return 0;

  }

  
  

• Anders Edstr&amp;#246;m

  Hi Maks,
   It would be great if you can log the perfromance issue at http://lab.msdn.microsoft.com/productfeedback/default.aspx. Please include a sample project reproducing the issue.
  
  Also, after you log the issue please post the link here and I will make sure the reponsible folks take a look at it.
  
  In addition, if you have msdn subscription, try using the latest CTP builds there.
  
  Thanks in advance for taking the time to report the issue.
  
  Thanks,
    Ayman Shoukry
    VC++ Team
  
  
• Performance problems after porting to VS 2005 from 2003, native C++ code vs STL.