>
>
> step-40 tries to allow switching between Trilinos and PETSc as easy as
> possible by using the deal.II/lac/generic_linear_algebra.h header and the
> defining the LA::MPI namespace.
>
Thanks for your answer, Daniel. Even with that example I find it a little
harder than I expected to use classes from PETSc instead of Trilinos. For
instance:
const LinearSolvers::InverseMatrix<PETScWrappers::SparseMatrix,
PETScWrappers::PreconditionICC>
mp_inverse(stokes_preconditioner_matrix.block(1, 1),
*Mp_preconditioner);
Cannot compile, I am trying to use a
static_cast<PETScWrappers::SparseMatrix>(stokes_preconditioner_matrix.block(1,
1)) now, but I don't think it will be a good idea.
Another weak point in my porting is
template <class PreconditionerTypeA, class PreconditionerTypeMp>
BlockSchurPreconditioner<PreconditionerTypeA, PreconditionerTypeMp>::
BlockSchurPreconditioner(
const PETScWrappers::MPI::BlockSparseMatrix &S,
const InverseMatrix<PETScWrappers::SparseMatrix,
PreconditionerTypeMp> &Mpinv,
const PreconditionerTypeA & Apreconditioner)
: stokes_matrix(&S)
, m_inverse(&Mpinv)
, a_preconditioner(Apreconditioner)
, tmp(complete_index_set(stokes_matrix->block(1, 1).m()))
{}
where tmp (a mutable PETScWrappers::MPI::Vector) cannot be initialized.
Adding MPI_COMM_WORLD make it compile, though.
Again with matrices, I have made the following changes:
//temperature_matrix.copy_from(temperature_mass_matrix);
temperature_matrix = 0;
temperature_matrix.add(1.0, temperature_mass_matrix);
I hope the change works...
Can I ask why there are some discrepancies between those two wrappers?
Apart from an obvious one, that they're different libraries, but uniformity
may help a lot IMO.
>
>> [...]
>> std::shared_ptr<PETScWrappers::PreconditionILU> Amg_preconditioner;
>>
>
> This looks inappropriate. Probably it should rather be
> PETScWrappers::PreconditionBoomerAMG;
>
Yes, I know :) I am first trying to make it compile, then I will try to use
a good preconditioner (Boomer requires Hypre, and it needs MPI, so right
now it is not an option).
Thanks!
Franco
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