From: Marc Fehling Date: Sat, 24 Jul 2021 00:10:09 +0000 (-0600) Subject: Remove custom repartitioning from load. X-Git-Tag: v9.4.0-rc1~1072^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12596%2Fhead;p=dealii.git Remove custom repartitioning from load. --- diff --git a/doc/news/changes/incompatibilities/20210723Fehling b/doc/news/changes/incompatibilities/20210723Fehling new file mode 100644 index 0000000000..276b0a3f5a --- /dev/null +++ b/doc/news/changes/incompatibilities/20210723Fehling @@ -0,0 +1,6 @@ +Changed: Custom repartitioning via Triangulation::Signals::cell_weight +is no longer part of parallel::distributed::Triangulation::load(). If +desired, call parallel::distributed::Triangulation::repartition() +manually after load(). +
+(Marc Fehling, 2021/07/23) diff --git a/include/deal.II/distributed/tria.h b/include/deal.II/distributed/tria.h index 65860b9fcc..f64343ccc1 100644 --- a/include/deal.II/distributed/tria.h +++ b/include/deal.II/distributed/tria.h @@ -594,17 +594,22 @@ namespace parallel * You do not need to load with the same number of MPI processes that * you saved with. Rather, if a mesh is loaded with a different number * of MPI processes than used at the time of saving, the mesh is - * repartitioned appropriately. Cell-based data that was saved with + * repartitioned that the number of cells is balanced among all processes. + * Individual repartitioning, e.g., based on the number of dofs or + * particles per cell, needs to be invoked manually by calling + * repartition() afterwards. + * + * Cell-based data that was saved with * DistributedTriangulationBase::DataTransfer::register_data_attach() can * be read in with * DistributedTriangulationBase::DataTransfer::notify_ready_to_unpack() * after calling load(). * - * If you use p4est version > 0.3.4.2 the @p autopartition flag tells - * p4est to ignore the partitioning that the triangulation had when it - * was saved and make it uniform upon loading. If @p autopartition is - * set to false, the triangulation is only repartitioned if needed (i.e. - * if a different number of MPI processes is encountered). + * The @p autopartition flag tells p4est to ignore the partitioning that + * the triangulation had when it was saved and make it uniform upon + * loading. If @p autopartition is set to true, the triangulation will + * always be repartitioned. If set to false, it is only repartitioned if + * needed (i.e., if a different number of MPI processes is encountered). */ virtual void load(const std::string &filename, diff --git a/source/distributed/tria.cc b/source/distributed/tria.cc index e7f0271692..384da4c465 100644 --- a/source/distributed/tria.cc +++ b/source/distributed/tria.cc @@ -1534,8 +1534,8 @@ namespace parallel filename.c_str(), this->mpi_communicator, 0, - false, - autopartition, + 0, + static_cast(autopartition), 0, this, &connectivity); @@ -1547,49 +1547,10 @@ namespace parallel // number of CPUs and so everything works without this call, but // this command changes the distribution for some reason, so we // will leave it in here. - if (this->signals.cell_weight.num_slots() == 0) - { - // no cell weights given -- call p4est's 'partition' without a - // callback for cell weights - dealii::internal::p4est::functions::partition( - parallel_forest, - /* prepare coarsening */ 1, - /* weight_callback */ nullptr); - } - else - { - // first, align both dealii and p4est meshes, which is a - // requirement of our internal cell weights algorithm - try - { - copy_local_forest_to_triangulation(); - } - catch (const typename Triangulation::DistortedCellList &) - { - // the underlying triangulation should not be checking for - // distorted cells - Assert(false, ExcInternalError()); - } - - // get cell weights for a weighted repartitioning. - const std::vector cell_weights = get_cell_weights(); - - PartitionWeights partition_weights(cell_weights); - - // attach (temporarily) a pointer to the cell weights through - // p4est's user_pointer object - Assert(parallel_forest->user_pointer == this, ExcInternalError()); - parallel_forest->user_pointer = &partition_weights; - - dealii::internal::p4est::functions::partition( - parallel_forest, - /* prepare coarsening */ 1, - /* weight_callback */ - &PartitionWeights::cell_weight); - - // reset the user pointer to its previous state - parallel_forest->user_pointer = this; - } + dealii::internal::p4est::functions::partition( + parallel_forest, + /* prepare coarsening */ 1, + /* weight_callback */ nullptr); } try