Wolfgang, Upon further investigation you are correct. If I go beyond 4 processors I get the same error even with the default zero subdivisions.
Thank you for your response. - Justin On Tuesday, December 13, 2016 at 12:00:18 PM UTC-5, Wolfgang Bangerth wrote: > > Justin > Is 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. > Best > Wolfgang > > > > Sent from Samsung tablet. > > > -------- Original message -------- > From: Justin Kauffman <jak...@gmail.com <javascript:>> > Date: 12/13/2016 07:46 (GMT-07:00) > To: "deal.II User Group" <dea...@googlegroups.com <javascript:>> > 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::valid > Additional 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 > > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > --- > You received this message because you are subscribed to the Google Groups > "deal.II User Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to dealii+un...@googlegroups.com <javascript:>. > For more options, visit https://groups.google.com/d/optout. > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
