Actual source code: ex16.c

petsc-master 2018-09-17
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  2: static char help[] = "Tests calling PetscOptionsSetValue() before PetscInitialize()\n\n";

  4: /*T
  5:    Concepts: introduction to PETSc;
  6:    Concepts: printing^in parallel
  7:    Processors: n
  8: T*/

 10:  #include <petscsys.h>
 11: int main(int argc,char **argv)
 12: {
 14:   PetscMPIInt    rank,size;

 16:   /*
 17:     Every PETSc routine should begin with the PetscInitialize() routine.
 18:     argc, argv - These command line arguments are taken to extract the options
 19:                  supplied to PETSc and options supplied to MPI.
 20:     help       - When PETSc executable is invoked with the option -help,
 21:                  it prints the various options that can be applied at
 22:                  runtime.  The user can use the "help" variable place
 23:                  additional help messages in this printout.

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

 28:     Since PetscOptionsSetValue() is called before the PetscInitialize() we cannot call 
 29:     CHKERRQ() on the error code and just return it directly.
 30:   */
 31:   PetscOptionsSetValue(NULL,"-no_signal_handler","true");if (ierr) return ierr;
 32:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 33:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 34:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 35:   PetscPrintf(PETSC_COMM_WORLD,"Number of processors = %d, rank = %d\n",size,rank);
 36:   PetscFinalize();
 37:   return ierr;
 38: }


 41: /*TEST

 43:    test:
 44:       nsize: 2
 45:       args: -options_view -get_total_flops
 46:       filter: egrep -v "(malloc|display|nox|Total flops|saws_port_auto_select|vecscatter_mpi1|options_left|error_output_stdout|check_pointer_intensity)"

 48: TEST*/