1 2 static char help[] = "Demonstrates call PETSc first and then Trilinos in the same program.\n\n"; 3 4 /* 5 Example obtained from: http://trilinos.org/docs/dev/packages/tpetra/doc/html/Tpetra_Lesson01.html 6 */ 7 8 #include <petscsys.h> 9 #include <Teuchos_DefaultMpiComm.hpp> // wrapper for MPI_Comm 10 #include <Tpetra_Version.hpp> // Tpetra version string 11 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 } 22 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; 35 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 */ 45 PetscFunctionBeginUser; 46 PetscCall(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; 57 58 PetscCall(PetscFinalize()); 59 return 0; 60 } 61 62 /*TEST 63 64 build: 65 requires: trilinos 66 67 test: 68 nsize: 3 69 filter: grep -v "Tpetra in Trilinos" 70 71 TEST*/ 72