Marc Fehling

> My guess is that only [...] has to be adjusted so that the matrix-free implementation is picked up. Will try and also come up with a test.

In the `project_matrix_free` function, the number of FEs is specifically restricted to one, which is used for some more assertions and to build a quadrature rule. The rest of the...

> @marcfehling Could you run the tests from your paper to see how fast loading DoF indices is currently. Sorry, I did miss your message. I will run some comparing...

Again, sorry that I gave this PR such a low priority. I will run my examples this week and provide you with timing results.

I've run the two scenarios from our parallel-hp paper: the Laplace problem on the L-shape domain, and the Stokes problem on the Y-pipe. I chose problem sizes that could be...

``` In file included from /jenkins/workspace/dealii_PR-14185/tests/all-headers/test_header.cc:17:0: /jenkins/workspace/dealii_PR-14185/include/deal.II/base/partitioner.templates.h: In member function ‘void dealii::Utilities::MPI::Partitioner::export_to_ghosted_array_start(unsigned int, const dealii::ArrayView&, const dealii::ArrayView&, const dealii::ArrayView&, std::vector&) const’: /jenkins/workspace/dealii_PR-14185/include/deal.II/base/partitioner.templates.h:68:25: error: ‘dealii::Utilities::MPI::internal’ has not been declared Utilities::MPI::internal::Tags::partitioner_export_start +...

Thank you for formulating your ideas in this PR! I remember our discussion and need to find the notes I took back then. If I remember correctly, I was not...

...and we also need to make sure that this works in the `serial` and `parallel::shared` cases as well...

> I think it covers all the cases but it will be a real pain to use when the cells don't have the same refinement level. I don't want the...

``` 3041/4557 Test #3048: hp/field_transfer_03.debug ............................................................***Failed 5.62 sec /jenkins/workspace/dealii_PR-12759/tests/hp/field_transfer_03.cc: In function ‘int main(int, char**)’: /jenkins/workspace/dealii_PR-12759/tests/hp/field_transfer_03.cc:44:71: error: use of deleted function ‘dealii::parallel::distributed::Triangulation::Triangulation(const MPI_Comm&, typename dealii::Triangulation::MeshSmoothing, dealii::parallel::distributed::Triangulation::Settings) [with int dim = 2;...