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// Example of use of Epetra_Time and Epetra_Flops

#include "Didasko_ConfigDefs.h"
#if defined(HAVE_DIDASKO_EPETRA)

#include "Epetra_ConfigDefs.h"
#ifdef HAVE_MPI
#include "mpi.h"
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_Map.h"
#include "Epetra_Vector.h"
#include "Epetra_CrsMatrix.h"
#include "Epetra_Time.h"

int main(int argc, char *argv[])
{

#ifdef HAVE_MPI
  MPI_Init(&argc, &argv);
  Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
  Epetra_SerialComm Comm;
#endif
  
  bool verbose = (Comm.MyPID() == 0);

  // set global dimension to 5, could be any number
  int NumGlobalElements = 5;
  // create a map
  Epetra_Map Map(NumGlobalElements,0,Comm);
  // local number of rows
  int NumMyElements = Map.NumMyElements();
  // get update list
  int * MyGlobalElements = Map.MyGlobalElements( );

  // ============= CONSTRUCTION OF THE MATRIX ===========================
  // Create a Epetra_Matrix

  Epetra_CrsMatrix A(Copy,Map,3);

  // Add  rows one-at-a-time

  double *Values = new double[2];
  Values[0] = -1.0; Values[1] = -1.0;
  int *Indices = new int[2];
  double two = 2.0;
  int NumEntries;

  for( int i=0 ; i<NumMyElements; ++i ) {
    if (MyGlobalElements[i]==0) {
    Indices[0] = 1;
    NumEntries = 1;
    } else if (MyGlobalElements[i] == NumGlobalElements-1) {
      Indices[0] = NumGlobalElements-2;
      NumEntries = 1;
    } else {
      Indices[0] = MyGlobalElements[i]-1;
      Indices[1] = MyGlobalElements[i]+1;
      NumEntries = 2;
    }
    A.InsertGlobalValues(MyGlobalElements[i], NumEntries, Values, Indices);
    // Put in the diagonal entry
    A.InsertGlobalValues(MyGlobalElements[i], 1, &two, MyGlobalElements+i);
  }
  
  // Finish up
  A.FillComplete();

  // ================ CONSTRUCTION OF VECTORS =======================
  
  // build up two distributed vectors q and z, and compute
  // q = A * z
  Epetra_Vector q(A.RowMap());
  Epetra_Vector z(A.RowMap());

  // Fill z with 1's
  z.PutScalar( 1.0 );

  // ================ USE OF TIME AND FLOPS =========================
  
  Epetra_Flops counter;
  A.SetFlopCounter(counter);
  Epetra_Time timer(Comm);

  A.Multiply(false, z, q); // Compute q = A*z

  double elapsed_time = timer.ElapsedTime();
  double total_flops =counter.Flops();
  if (verbose)
    cout << "Total ops: " << total_flops << endl;
  double MFLOPs = total_flops/elapsed_time/1000000.0;
  if (verbose)
    cout << "Total MFLOPs  for mat-vec = " << MFLOPs << endl<< endl;

  double dotProduct;
  z.SetFlopCounter(counter);
  timer.ResetStartTime();
  z.Dot(q, &dotProduct);

  total_flops =counter.Flops();
  if (verbose)
    cout << "Total ops: " << total_flops << endl;

  elapsed_time = timer.ElapsedTime();
  if (elapsed_time != 0.0)
    MFLOPs = (total_flops / elapsed_time) / 1000000.0;
  else
    MFLOPs = 0;

  if (verbose)
  {
    cout << "Total MFLOPs for vec-vec = " << MFLOPs << endl<< endl;
    cout << "q dot z = " << dotProduct << endl;
  }

#ifdef HAVE_MPI
  MPI_Finalize();
#endif

  return( 0 );

} /* main */

#else

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  puts("Please configure Didasko with:\n"
       "--enable-epetra");

  return 0;
}
#endif

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