1 2 static char help[] = "Tests calling PetscOptionsSetValue() before PetscInitialize()\n\n"; 3 4 #include <petscsys.h> 5 int main(int argc, char **argv) 6 { 7 PetscMPIInt rank, size; 8 9 /* 10 Every PETSc routine should begin with the PetscInitialize() routine. 11 argc, argv - These command line arguments are taken to extract the options 12 supplied to PETSc and options supplied to MPI. 13 help - When PETSc executable is invoked with the option -help, 14 it prints the various options that can be applied at 15 runtime. The user can use the "help" variable place 16 additional help messages in this printout. 17 18 Since when PetscInitialize() returns with an error the PETSc data structures 19 may not be set up hence we cannot call PetscCall() hence directly return the error code. 20 21 Since PetscOptionsSetValue() is called before the PetscInitialize() we cannot call 22 PetscCall() on the error code and just return it directly. 23 */ 24 PetscCall(PetscOptionsSetValue(NULL, "-no_signal_handler", "true")); 25 PetscFunctionBeginUser; 26 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 27 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 28 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 29 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Number of processors = %d, rank = %d\n", size, rank)); 30 PetscCall(PetscFinalize()); 31 return 0; 32 } 33 34 /*TEST 35 36 test: 37 requires: defined(PETSC_USE_LOG) 38 nsize: 2 39 args: -options_view -get_total_flops 40 filter: grep -E -v "(cuda_initialize|Total flops|options_left)" 41 42 TEST*/ 43