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. 15*d71ae5a4SJacob Faibussowitsch void exampleRoutine(const Teuchos::RCP<const Teuchos::Comm<int>> &comm) 16*d71ae5a4SJacob Faibussowitsch { 17c4762a1bSJed Brown if (comm->getRank() == 0) { 18c4762a1bSJed Brown // On (MPI) Process 0, print out the Tpetra software version. 19c4762a1bSJed Brown std::cout << Tpetra::version() << std::endl << std::endl; 20c4762a1bSJed Brown } 21c4762a1bSJed Brown } 22c4762a1bSJed Brown 23*d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv) 24*d71ae5a4SJacob Faibussowitsch { 25c4762a1bSJed Brown // These "using" declarations make the code more concise, in that 26c4762a1bSJed Brown // you don't have to write the namespace along with the class or 27c4762a1bSJed Brown // object name. This is especially helpful with commonly used 28c4762a1bSJed Brown // things like std::endl or Teuchos::RCP. 29c4762a1bSJed Brown using std::cout; 30c4762a1bSJed Brown using std::endl; 31c4762a1bSJed Brown using Teuchos::Comm; 32c4762a1bSJed Brown using Teuchos::MpiComm; 33c4762a1bSJed Brown using Teuchos::RCP; 34c4762a1bSJed Brown using Teuchos::rcp; 35c4762a1bSJed Brown 36c4762a1bSJed Brown /* 37c4762a1bSJed Brown Every PETSc routine should begin with the PetscInitialize() routine. 38c4762a1bSJed Brown argc, argv - These command line arguments are taken to extract the options 39c4762a1bSJed Brown supplied to PETSc and options supplied to MPI. 40c4762a1bSJed Brown help - When PETSc executable is invoked with the option -help, 41c4762a1bSJed Brown it prints the various options that can be applied at 42c4762a1bSJed Brown runtime. The user can use the "help" variable place 43c4762a1bSJed Brown additional help messages in this printout. 44c4762a1bSJed Brown */ 45327415f7SBarry Smith PetscFunctionBeginUser; 46b8abcfdeSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 47c4762a1bSJed Brown RCP<const Comm<int>> comm(new MpiComm<int>(PETSC_COMM_WORLD)); 48c4762a1bSJed Brown // Get my process' rank, and the total number of processes. 49c4762a1bSJed Brown // Equivalent to MPI_Comm_rank resp. MPI_Comm_size. 50c4762a1bSJed Brown const int myRank = comm->getRank(); 51c4762a1bSJed Brown const int size = comm->getSize(); 52ad540459SPierre Jolivet if (myRank == 0) cout << "Total number of processes: " << size << endl; 53c4762a1bSJed Brown // Do something with the new communicator. 54c4762a1bSJed Brown exampleRoutine(comm); 55c4762a1bSJed Brown // This tells the Trilinos test framework that the test passed. 56ad540459SPierre Jolivet if (myRank == 0) cout << "End Result: TEST PASSED" << endl; 57c4762a1bSJed Brown 58b8abcfdeSJacob Faibussowitsch PetscCall(PetscFinalize()); 59b8abcfdeSJacob Faibussowitsch return 0; 60c4762a1bSJed Brown } 61c4762a1bSJed Brown 62c4762a1bSJed Brown /*TEST 63c4762a1bSJed Brown 64c4762a1bSJed Brown build: 65c4762a1bSJed Brown requires: trilinos 66c4762a1bSJed Brown 67c4762a1bSJed Brown test: 68c4762a1bSJed Brown nsize: 3 69c4762a1bSJed Brown filter: grep -v "Tpetra in Trilinos" 70c4762a1bSJed Brown 71c4762a1bSJed Brown TEST*/ 72