Date: 2026-06-01T23:13:45+00:00

Actual source code: ex16.c

      1: static char help[] = "Tests calling PetscOptionsSetValue() before PetscInitialize()\n\n";

      3: #include <petscsys.h>
      4: int main(int argc, char **argv)
      5: {
      6:   PetscMPIInt rank, size;

      8:   /*
      9:     Every PETSc routine should begin with the PetscInitialize() routine.
     10:     argc, argv - These command line arguments are taken to extract the options
     11:                  supplied to PETSc and options supplied to MPI.
     12:     help       - When PETSc executable is invoked with the option -help,
     13:                  it prints the various options that can be applied at
     14:                  runtime.  The user can use the "help" variable place
     15:                  additional help messages in this printout.

     17:     Since when PetscInitialize() returns with an error the PETSc data structures
     18:     may not be set up hence we cannot call PetscCall() hence directly return the error code.

     20:     Since PetscOptionsSetValue() is called before the PetscInitialize() we cannot call
     21:     PetscCall() on the error code and just return it directly.
     22:   */
     23:   PetscCall(PetscOptionsSetValue(NULL, "-no_signal_handler", "true"));
     24:   PetscFunctionBeginUser;
     25:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
     26:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
     27:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
     28:   PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Number of processors = %d, rank = %d\n", size, rank));
     29:   PetscCall(PetscFinalize());
     30:   return 0;
     31: }

     33: /*TEST

     35:    test:
     36:       requires: defined(PETSC_USE_LOG)
     37:       nsize: 2
     38:       args: -options_view -get_total_flops
     39:       filter: grep -E -v "(cuda_initialize|Total flops)"

     41: TEST*/