Actual source code: ex45.cxx
2: static char help[] = "Demonstrates call PETSc first and then Trilinos in the same program.\n\n";
4: /*
5: Example obtained from: http://trilinos.org/docs/dev/packages/tpetra/doc/html/Tpetra_Lesson01.html
6: */
8: #include <petscsys.h>
9: #include <Teuchos_DefaultMpiComm.hpp> // wrapper for MPI_Comm
10: #include <Tpetra_Version.hpp> // Tpetra version string
12: // Do something with the given communicator. In this case, we just
13: // print Tpetra's version to stdout on Process 0 in the given
14: // communicator.
15: void exampleRoutine(const Teuchos::RCP<const Teuchos::Comm<int>> &comm)
16: {
17: if (comm->getRank() == 0) {
18: // On (MPI) Process 0, print out the Tpetra software version.
19: std::cout << Tpetra::version() << std::endl << std::endl;
20: }
21: }
23: int main(int argc, char **argv)
24: {
25: // These "using" declarations make the code more concise, in that
26: // you don't have to write the namespace along with the class or
27: // object name. This is especially helpful with commonly used
28: // things like std::endl or Teuchos::RCP.
29: using std::cout;
30: using std::endl;
31: using Teuchos::Comm;
32: using Teuchos::MpiComm;
33: using Teuchos::RCP;
34: using Teuchos::rcp;
36: /*
37: Every PETSc routine should begin with the PetscInitialize() routine.
38: argc, argv - These command line arguments are taken to extract the options
39: supplied to PETSc and options supplied to MPI.
40: help - When PETSc executable is invoked with the option -help,
41: it prints the various options that can be applied at
42: runtime. The user can use the "help" variable place
43: additional help messages in this printout.
44: */
46: PetscInitialize(&argc, &argv, (char *)0, help);
47: RCP<const Comm<int>> comm(new MpiComm<int>(PETSC_COMM_WORLD));
48: // Get my process' rank, and the total number of processes.
49: // Equivalent to MPI_Comm_rank resp. MPI_Comm_size.
50: const int myRank = comm->getRank();
51: const int size = comm->getSize();
52: if (myRank == 0) cout << "Total number of processes: " << size << endl;
53: // Do something with the new communicator.
54: exampleRoutine(comm);
55: // This tells the Trilinos test framework that the test passed.
56: if (myRank == 0) cout << "End Result: TEST PASSED" << endl;
58: PetscFinalize();
59: return 0;
60: }
62: /*TEST
64: build:
65: requires: trilinos
67: test:
68: nsize: 3
69: filter: grep -v "Tpetra in Trilinos"
71: TEST*/