1: ! Tests calling PetscOptionsSetValue() before PetscInitialize(): Fortran Example

  3: program main
  4: #include <petsc/finclude/petscsys.h>
  5:   use petscmpi  ! or mpi or mpi_f08
  6:   use petscsys

  8:   implicit none
  9:   PetscErrorCode :: ierr
 10:   PetscMPIInt  ::  rank, size
 11:   character(len=80) :: outputString

 13:   ! Every PETSc routine should begin with the PetscInitialize() routine.

 15:   PetscCallA(PetscOptionsSetValue(PETSC_NULL_OPTIONS, '-no_signal_handler', 'true', ierr))
 16:   PetscCallA(PetscInitialize(ierr))

 18:   ! We can now change the communicator universe for PETSc

 20:   PetscCallMPIA(MPI_Comm_size(MPI_COMM_WORLD, size, ierr))
 21:   PetscCallMPIA(MPI_Comm_rank(MPI_COMM_WORLD, rank, ierr))
 22:   write (outputString, *) 'Number of processors =', size, 'rank =', rank, '\n'
 23:   PetscCallA(PetscPrintf(PETSC_COMM_WORLD, outputString, ierr))
 24:   PetscCallA(PetscFinalize(ierr))
 25: end program main

 27: !/*TEST
 28: !
 29: !   test:
 30: !      requires: defined(PETSC_USE_LOG)
 31: !      nsize: 2
 32: !      args: -options_view -get_total_flops
 33: !      filter: grep -E -v "(Total flops)"
 34: !
 35: !TEST*/