From: Peter Munch Date: Sat, 26 Sep 2020 12:56:13 +0000 (+0200) Subject: MGTwoLevelTransfer: specialization for identity X-Git-Tag: v9.3.0-rc1~1062^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F10975%2Fhead;p=dealii.git MGTwoLevelTransfer: specialization for identity --- diff --git a/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h b/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h index 5d4cab9ddb..dc87e38e77 100644 --- a/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h +++ b/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h @@ -1649,6 +1649,36 @@ MGTwoLevelTransfer>::prolongate( for (const auto &scheme : schemes) { + // identity -> take short cut and work directly on global vectors + if (scheme.degree_fine == scheme.degree_coarse) + { + const unsigned int *indices_fine = + scheme.level_dof_indices_fine.data(); + const unsigned int *indices_coarse = + scheme.level_dof_indices_coarse.data(); + const Number *weights = nullptr; + + if (scheme.fine_element_is_continuous) + weights = scheme.weights.data(); + + for (unsigned int cell = 0; cell < scheme.n_coarse_cells; ++cell) + { + for (unsigned int i = 0; i < scheme.dofs_per_cell_fine; ++i) + this->vec_fine.local_element(indices_fine[i]) += + this->vec_coarse.local_element(indices_coarse[i]) * + (scheme.fine_element_is_continuous ? weights[i] : 1.0); + + indices_fine += scheme.dofs_per_cell_fine; + indices_coarse += scheme.dofs_per_cell_coarse; + + if (scheme.fine_element_is_continuous) + weights += scheme.dofs_per_cell_fine; + } + + continue; + } + + // general case -> local restriction is needed evaluation_data_fine.resize(scheme.dofs_per_cell_fine); evaluation_data_coarse.resize(scheme.dofs_per_cell_fine); @@ -1692,29 +1722,26 @@ MGTwoLevelTransfer>::prolongate( } // ------------------------------ fine ----------------------------- - if (scheme.fine_element_is_continuous) - { - const Number *w = - &scheme.weights[cell * scheme.dofs_per_cell_fine]; - for (unsigned int v = 0; v < n_lanes_filled; ++v) - { - for (unsigned int i = 0; i < scheme.dofs_per_cell_fine; ++i) - evaluation_data_fine[i][v] *= w[i]; - w += scheme.dofs_per_cell_fine; - } - } - - - // write into dst vector + // weight and write into dst vector { const unsigned int *indices = &scheme.level_dof_indices_fine[cell * scheme.dofs_per_cell_fine]; + const Number *weights = nullptr; + + if (scheme.fine_element_is_continuous) + weights = &scheme.weights[cell * scheme.dofs_per_cell_fine]; + for (unsigned int v = 0; v < n_lanes_filled; ++v) { for (unsigned int i = 0; i < scheme.dofs_per_cell_fine; ++i) this->vec_fine.local_element(indices[i]) += - evaluation_data_fine[i][v]; + evaluation_data_fine[i][v] * + (scheme.fine_element_is_continuous ? weights[i] : 1.0); + indices += scheme.dofs_per_cell_fine; + + if (scheme.fine_element_is_continuous) + weights += scheme.dofs_per_cell_fine; } } } @@ -1751,6 +1778,38 @@ MGTwoLevelTransfer>:: for (const auto &scheme : schemes) { + // identity -> take short cut and work directly on global vectors + if (scheme.degree_fine == scheme.degree_coarse) + { + const unsigned int *indices_fine = + scheme.level_dof_indices_fine.data(); + const unsigned int *indices_coarse = + scheme.level_dof_indices_coarse.data(); + const Number *weights = nullptr; + + if (scheme.fine_element_is_continuous) + weights = scheme.weights.data(); + + for (unsigned int cell = 0; cell < scheme.n_coarse_cells; ++cell) + { + for (unsigned int i = 0; i < scheme.dofs_per_cell_fine; ++i) + constraint_coarse.distribute_local_to_global( // TODO? + partitioner_coarse->local_to_global(indices_coarse[i]), + this->vec_fine.local_element(indices_fine[i]) * + (scheme.fine_element_is_continuous ? weights[i] : 1.0), + this->vec_coarse); + + indices_fine += scheme.dofs_per_cell_fine; + indices_coarse += scheme.dofs_per_cell_coarse; + + if (scheme.fine_element_is_continuous) + weights += scheme.dofs_per_cell_fine; + } + + continue; + } + + // general case -> local restriction is needed evaluation_data_fine.resize(scheme.dofs_per_cell_fine); evaluation_data_coarse.resize(scheme.dofs_per_cell_fine); @@ -1768,31 +1827,29 @@ MGTwoLevelTransfer>:: (scheme.n_coarse_cells - cell) : n_lanes; - // read from source vector + // read from source vector and weight { const unsigned int *indices = &scheme.level_dof_indices_fine[cell * scheme.dofs_per_cell_fine]; + const Number *weights = nullptr; + + if (scheme.fine_element_is_continuous) + weights = &scheme.weights[cell * scheme.dofs_per_cell_fine]; + for (unsigned int v = 0; v < n_lanes_filled; ++v) { for (unsigned int i = 0; i < scheme.dofs_per_cell_fine; ++i) evaluation_data_fine[i][v] = - this->vec_fine.local_element(indices[i]); + this->vec_fine.local_element(indices[i]) * + (scheme.fine_element_is_continuous ? weights[i] : 1.0); + indices += scheme.dofs_per_cell_fine; + + if (scheme.fine_element_is_continuous) + weights += scheme.dofs_per_cell_fine; } } - if (scheme.fine_element_is_continuous) - { - const Number *w = - &scheme.weights[cell * scheme.dofs_per_cell_fine]; - for (unsigned int v = 0; v < n_lanes_filled; ++v) - { - for (unsigned int i = 0; i < scheme.dofs_per_cell_fine; ++i) - evaluation_data_fine[i][v] *= w[i]; - w += scheme.dofs_per_cell_fine; - } - } - // ------------------------------ fine ----------------------------- for (int c = n_components - 1; c >= 0; --c) {