fevector.cpp

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/*--------------------------------------------------------------------*/
#include "Epetra_FEVector.h"
 
#ifdef HAVE_MPI
 
#include <time.h>
#include "mpi.h"
#include "Epetra_Map.h"
#include "Epetra_MpiComm.h"
 
int main(int argCount, char **argValue)
{
#ifndef NDEBUG
  int ierr;
#endif
  MPI_Init(&argCount,&argValue);
  Epetra_MpiComm Comm(MPI_COMM_WORLD);
  const int rank = Comm.MyPID();
 
  // Construct a Map
  int nGlobalElements = 1000000;
  Epetra_Map Map(nGlobalElements, 0, Comm);
 
  // Create a vector
  Epetra_FEVector b(Map, 1);
 
  time_t startTime = 0;
  if (rank == 0) {
    startTime = time(0);
  }
 
  // Fill matrix on the master process
  if (rank == 0) {
    double values[1];
    int    indices[1];
 
    for (int globalRowIdx=0; globalRowIdx<nGlobalElements; ++globalRowIdx) {
      indices[0] = globalRowIdx;
      values[0] = 3.2 + globalRowIdx*0.01;
 
      if (globalRowIdx % 10000 == 0) {
  std::cerr << "About to insert row " << globalRowIdx << "\n";
      }
 
#ifndef NDEBUG
      ierr =
#endif
      b.ReplaceGlobalValues(1, (const int *)&indices[0],
           (const double *)&values[0]);
      assert(ierr==0);
    }
  }
 
  double insertionTime = 0;
  if (rank == 0) {
    time_t endTime = time(0);
    insertionTime = difftime(endTime, startTime);
  }
 
  // Finish up
#ifndef NDEBUG
  ierr =
#endif
  b.GlobalAssemble();
  assert(ierr==0);
 
  if (rank == 0) {
    std::cerr << "insertion time = " << insertionTime << " (seconds)\n";
  }
 
 
  MPI_Finalize();
 
  return 0;
}
#else
int main(int,char**)
{
  return 0;
}
#endif
/*--------------------------------------------------------------------*/