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example/UG_ExMaps/cxx_main.cpp
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41 
42 
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include "Epetra_config.h"
46 #ifdef HAVE_MPI
47 #include "mpi.h"
48 #include "Epetra_MpiComm.h"
49 #else
50 #include "Epetra_SerialComm.h"
51 #endif
52 #include "Epetra_Map.h"
54 #include "Epetra_Version.h"
55 
56 // prototype
57 int main(int argc, char *argv[]) {
58 #ifdef HAVE_MPI
59  MPI_Init(&argc,&argv);
60  Epetra_MpiComm Comm(MPI_COMM_WORLD);
61 #else
62  Epetra_SerialComm Comm;
63 #endif
64 
65  if (Comm.MyPID()==0)
66  std::cout << Epetra_Version() << std::endl << std::endl;
67 
68  std::cout << Comm << std::endl; // Print out process information
69  // Get the number of global equations from the command line
70  if (argc!=2) {
71  std::cout << "Usage: " << argv[0] << " number_of_equations" << std::endl;
72  exit(1);
73  }
74  int NumGlobalElements = atoi(argv[1]);
75  // Construct a Map that puts approximately the same number of
76  // equations on each processor.
77  Epetra_Map Map(NumGlobalElements, 0, Comm);
78  // Get update list and number of local equations from newly created Map.
79  std::cout << Map << std::endl;
80 #ifdef UG_EX1_MPI
81  MPI_Finalize() ;
82 #endif
83 return 0;
84 }
Epetra_Map: A class for partitioning vectors and matrices.
Definition: Epetra_Map.h:127
int MyPID() const
Return my process ID.
Epetra_MpiComm: The Epetra MPI Communication Class.
std::string Epetra_Version()
Epetra_SerialComm: The Epetra Serial Communication Class.
int main(int argc, char *argv[])