1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Demonstrates call PETSc first and then Trilinos in the same program.\n\n"; 3c4762a1bSJed Brown 41bb3edfdSPatrick Sanan /* 5c4762a1bSJed Brown Example obtained from: http://trilinos.org/docs/dev/packages/tpetra/doc/html/Tpetra_Lesson01.html 61bb3edfdSPatrick Sanan */ 7c4762a1bSJed Brown 8c4762a1bSJed Brown #include <petscsys.h> 9c4762a1bSJed Brown #include <Teuchos_DefaultMpiComm.hpp> // wrapper for MPI_Comm 10c4762a1bSJed Brown #include <Tpetra_Version.hpp> // Tpetra version string 11c4762a1bSJed Brown 12c4762a1bSJed Brown // Do something with the given communicator. In this case, we just 13c4762a1bSJed Brown // print Tpetra's version to stdout on Process 0 in the given 14c4762a1bSJed Brown // communicator. 159371c9d4SSatish Balay void exampleRoutine(const Teuchos::RCP<const Teuchos::Comm<int>> &comm) { 16c4762a1bSJed Brown if (comm->getRank() == 0) { 17c4762a1bSJed Brown // On (MPI) Process 0, print out the Tpetra software version. 18c4762a1bSJed Brown std::cout << Tpetra::version() << std::endl << std::endl; 19c4762a1bSJed Brown } 20c4762a1bSJed Brown } 21c4762a1bSJed Brown 229371c9d4SSatish Balay int main(int argc, char **argv) { 23c4762a1bSJed Brown // These "using" declarations make the code more concise, in that 24c4762a1bSJed Brown // you don't have to write the namespace along with the class or 25c4762a1bSJed Brown // object name. This is especially helpful with commonly used 26c4762a1bSJed Brown // things like std::endl or Teuchos::RCP. 27c4762a1bSJed Brown using std::cout; 28c4762a1bSJed Brown using std::endl; 29c4762a1bSJed Brown using Teuchos::Comm; 30c4762a1bSJed Brown using Teuchos::MpiComm; 31c4762a1bSJed Brown using Teuchos::RCP; 32c4762a1bSJed Brown using Teuchos::rcp; 33c4762a1bSJed Brown 34c4762a1bSJed Brown /* 35c4762a1bSJed Brown Every PETSc routine should begin with the PetscInitialize() routine. 36c4762a1bSJed Brown argc, argv - These command line arguments are taken to extract the options 37c4762a1bSJed Brown supplied to PETSc and options supplied to MPI. 38c4762a1bSJed Brown help - When PETSc executable is invoked with the option -help, 39c4762a1bSJed Brown it prints the various options that can be applied at 40c4762a1bSJed Brown runtime. The user can use the "help" variable place 41c4762a1bSJed Brown additional help messages in this printout. 42c4762a1bSJed Brown */ 43327415f7SBarry Smith PetscFunctionBeginUser; 44b8abcfdeSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 45c4762a1bSJed Brown RCP<const Comm<int>> comm(new MpiComm<int>(PETSC_COMM_WORLD)); 46c4762a1bSJed Brown // Get my process' rank, and the total number of processes. 47c4762a1bSJed Brown // Equivalent to MPI_Comm_rank resp. MPI_Comm_size. 48c4762a1bSJed Brown const int myRank = comm->getRank(); 49c4762a1bSJed Brown const int size = comm->getSize(); 50*ad540459SPierre Jolivet if (myRank == 0) cout << "Total number of processes: " << size << endl; 51c4762a1bSJed Brown // Do something with the new communicator. 52c4762a1bSJed Brown exampleRoutine(comm); 53c4762a1bSJed Brown // This tells the Trilinos test framework that the test passed. 54*ad540459SPierre Jolivet if (myRank == 0) cout << "End Result: TEST PASSED" << endl; 55c4762a1bSJed Brown 56b8abcfdeSJacob Faibussowitsch PetscCall(PetscFinalize()); 57b8abcfdeSJacob Faibussowitsch return 0; 58c4762a1bSJed Brown } 59c4762a1bSJed Brown 60c4762a1bSJed Brown /*TEST 61c4762a1bSJed Brown 62c4762a1bSJed Brown build: 63c4762a1bSJed Brown requires: trilinos 64c4762a1bSJed Brown 65c4762a1bSJed Brown test: 66c4762a1bSJed Brown nsize: 3 67c4762a1bSJed Brown filter: grep -v "Tpetra in Trilinos" 68c4762a1bSJed Brown 69c4762a1bSJed Brown TEST*/ 70