2: static char help[] = "Demonstrates call PETSc first and then Trilinos in the same program.\n\n";

  4: /*T
  5:    Concepts: introduction to PETSc^Trilinos
  6:    Processors: n

  8:    Example obtained from: http://trilinos.org/docs/dev/packages/tpetra/doc/html/Tpetra_Lesson01.html
  9: T*/



 13:  #include <petscsys.h>
 14: #include <Teuchos_DefaultMpiComm.hpp> // wrapper for MPI_Comm
 15: #include <Tpetra_Version.hpp> // Tpetra version string

 17: // Do something with the given communicator.  In this case, we just
 18: // print Tpetra's version to stdout on Process 0 in the given
 19: // communicator.
 20: void
 21: exampleRoutine (const Teuchos::RCP<const Teuchos::Comm<int> >& comm)
 22: {
 23:   if (comm->getRank () == 0) {
 24:     // On (MPI) Process 0, print out the Tpetra software version.
 25:     std::cout << Tpetra::version () << std::endl << std::endl;
 26:   }
 27: }

 29: int main(int argc,char **argv)
 30: {
 32:   // These "using" declarations make the code more concise, in that
 33:   // you don't have to write the namespace along with the class or
 34:   // object name.  This is especially helpful with commonly used
 35:   // things like std::endl or Teuchos::RCP.
 36:   using std::cout;
 37:   using std::endl;
 38:   using Teuchos::Comm;
 39:   using Teuchos::MpiComm;
 40:   using Teuchos::RCP;
 41:   using Teuchos::rcp;

 43:   /*
 44:     Every PETSc routine should begin with the PetscInitialize() routine.
 45:     argc, argv - These command line arguments are taken to extract the options
 46:                  supplied to PETSc and options supplied to MPI.
 47:     help       - When PETSc executable is invoked with the option -help,
 48:                  it prints the various options that can be applied at
 49:                  runtime.  The user can use the "help" variable place
 50:                  additional help messages in this printout.
 51:   */
 52:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 53:   RCP<const Comm<int> > comm (new MpiComm<int> (PETSC_COMM_WORLD));
 54:   // Get my process' rank, and the total number of processes.
 55:   // Equivalent to MPI_Comm_rank resp. MPI_Comm_size.
 56:   const int myRank = comm->getRank ();
 57:   const int size = comm->getSize ();
 58:   if (myRank == 0) {
 59:     cout << "Total number of processes: " << size << endl;
 60:   }
 61:   // Do something with the new communicator.
 62:   exampleRoutine (comm);
 63:   // This tells the Trilinos test framework that the test passed.
 64:   if (myRank == 0) {
 65:     cout << "End Result: TEST PASSED" << endl;
 66:   }

 68:   PetscFinalize();
 69:   return ierr;
 70: }


 73: /*TEST

 75:    build:
 76:      requires: trilinos

 78:    test:
 79:       nsize: 3
 80:       filter: grep -v "Tpetra in Trilinos"

 82: TEST*/