As a complement (I realized I should have put this in the first email),
here is (one of) the exception that is thrown with the attached MWE from
my first mail:
/An error occurred in line <738> of file
</home/gpoy/.local/share/deal-ii-candi/tmp/unpack/deal.II-v9.6.1/include/deal.II/base/partitioner.templates.h>
in function
void
dealii::Utilities::MPI::Partitioner::import_from_ghosted_array_finish(dealii::VectorOperation::values,
const dealii::ArrayView<const ElementType, MemorySpaceType>&, const
dealii::ArrayView<ElementType, MemorySpace>&, const
dealii::ArrayView<ElementType, MemorySpace>&,
std::vector<ompi_request_t*>&) const [with Number = double;
MemorySpaceType = dealii::MemorySpace::Host]
The violated condition was:
*read_position == Number() ||
internal::get_abs(locally_owned_array[j] - *read_position) <=
internal::get_abs(locally_owned_array[j] + *read_position) * 100000. *
std::numeric_limits<typename numbers::NumberTraits<
Number>::real_type>::epsilon()
Additional information:
Called compress(VectorOperation::insert), but the element received
from a remote processor, value 0.7071067811865476, does not match with
the value 0 on the owner processor 0
/
I also realized I was wrong below for the actual vector that fails to
compress when there are ghost hanging nodes: I think it corresponds to
the output vector "u2" in ExtrapolateImplementation<dim, spacedim,
OutVector>::extrapolate_parallel.
Best
Guilhem
On 10/04/2025 10:13, Guilhem Poy wrote:
Dear deal-ii users and developers,
I am trying to use the FETools::extrapolate method on a distributed
triangulation that is adaptively refined. However, I get an exception
inside this function every time my triangulation contains hanging
nodes at ghost interfaces. I have attached a minimal working example
that illustrates this on deal.II version 9.6.1. It should be compiled
in debug mode as for usual dealii example codes, and then run with
"mpirun -np 2 main" with two mpi ranks to generate the exception. The
macro NO_GHOST_HANGING_NODES can be commented out to check that
FETools::extrapolate works correctly when there are no hanging nodes
at ghost interfaces.
Before opening a bug, I would like to check with you that I am not
doing something wrong in this test program. I was careful to set up my
distributed vectors as large as possible (i.e. with all relevant dofs)
to see if the problem was coming from there, and of course I updated
the ghost values of the "coarse" vector before calling
FETools::extrapolate. If I am not mistaken, the exception is thrown
when an internal vector with all relevant dofs is compressed line 1455
of fe_tools_extrapolate.templates.h, but of course this internal
vector depends on the input vector I give to extrapolate so the
problem could very much come from my code. I am ready to provide any
further information that may be useful! Thanks in advance.
Best regards,
Guilhem
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