JustinIs it really working with zero subdivisions? Step 40 only uses the
DataOut class, not the DataOutFaces class, so that may not be the best
comparison. I don't recall whether the latter class works in parallel at all,
regardless of subdivision. BestWolfgang
Sent from Samsung tablet.
-------- Original message --------
From: Justin Kauffman <jak5...@gmail.com>
Date: 12/13/2016 07:46 (GMT-07:00)
To: "deal.II User Group" <dealii@googlegroups.com>
Subject: [deal.II] build_patches(degree) for higher order dg elements in
parallel
Hi all:
I am writing an HDG code and trying to parallelize it in a fashion similar to
step-40. I am having a problem with data_out.build_patches(degree). In step-40
the argument is the default value of zero, but I eventually want to run this
code for higher order dg elements. I believe that the problem in parallel is
that build_patches is trying to subdivide all cells for each processor (even
the ghost_cells) instead of just the locally_owned_cells. I get the following
error output:
An error occurred in line <934> of file </include/deal.II/grid/tria_iterator.h>
in function Accessor& dealii::TriaRawIterator<Accessor>::operator*() [with
Accessor = dealii::CellAccessor<2, 2>]The violated condition was:
Accessor::structure_dimension!=Accessor::dimension || state() ==
IteratorState::validAdditional information: You tried to dereference a cell
iterator for which this is not possible. More information on this iterator:
level=-2, index=-2, state=invalid
Stacktrace:-----------#0 dealii::TriaRawIterator<dealii::CellAccessor<2, 2>
>::operator*()#1 dealii::DataOutFaces<2, dealii::DoFHandler<2, 2>
>::next_face(std::pair<dealii::TriaIterator<dealii::CellAccessor<2, 2> >,
unsigned int> const&)#2 dealii::DataOutFaces<2, dealii::DoFHandler<2, 2>
>::build_patches(dealii::Mapping<2, 2> const&, unsigned int)#3
dealii::DataOutFaces<2, dealii::DoFHandler<2, 2> >::build_patches(unsigned int)
I am using deal.ii version 8.5.0-pre. In step-51 build_patches takes the dg
element degree as the argument and this is true when running on a single
processor, but breaks down when running on multiple processors. Any help would
be greatly appreciated.
Thank you,- Justin
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