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Reference documentation for deal.II version 9.1.0-pre
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Reference documentation for deal.II version 9.1.0-pre
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#include <deal.II/matrix_free/task_info.h>
Public Member Functions | |
| TaskInfo () | |
| void | clear () |
| void | loop (MFWorkerInterface &worker) const |
| void | collect_boundary_cells (const unsigned int n_active_cells, const unsigned int n_active_and_ghost_cells, const unsigned int vectorization_length, std::vector< unsigned int > &boundary_cells) |
| void | create_blocks_serial (const std::vector< unsigned int > &boundary_cells, const std::vector< unsigned int > &cells_close_to_boundary, const unsigned int dofs_per_cell, const std::vector< unsigned int > &cell_vectorization_categories, const bool cell_vectorization_categories_strict, std::vector< unsigned int > &renumbering, std::vector< unsigned char > &incompletely_filled_vectorization) |
| void | initial_setup_blocks_tasks (const std::vector< unsigned int > &boundary_cells, std::vector< unsigned int > &renumbering, std::vector< unsigned char > &incompletely_filled_vectorization) |
| void | guess_block_size (const unsigned int dofs_per_cell) |
| void | make_thread_graph_partition_color (DynamicSparsityPattern &connectivity, std::vector< unsigned int > &renumbering, std::vector< unsigned char > &irregular_cells, const bool hp_bool) |
| void | make_thread_graph_partition_partition (const std::vector< unsigned int > &cell_active_fe_index, DynamicSparsityPattern &connectivity, std::vector< unsigned int > &renumbering, std::vector< unsigned char > &irregular_cells, const bool hp_bool) |
| void | make_thread_graph (const std::vector< unsigned int > &cell_active_fe_index, DynamicSparsityPattern &connectivity, std::vector< unsigned int > &renumbering, std::vector< unsigned char > &irregular_cells, const bool hp_bool) |
| void | make_connectivity_cells_to_blocks (const std::vector< unsigned char > &irregular_cells, const DynamicSparsityPattern &connectivity_cells, DynamicSparsityPattern &connectivity_blocks) const |
| void | make_coloring_within_partitions_pre_blocked (const DynamicSparsityPattern &connectivity, const unsigned int partition, const std::vector< unsigned int > &cell_partition, const std::vector< unsigned int > &partition_list, const std::vector< unsigned int > &partition_size, std::vector< unsigned int > &partition_color_list) |
| void | make_partitioning_within_partitions_post_blocked (const DynamicSparsityPattern &connectivity, const std::vector< unsigned int > &cell_active_fe_index, const unsigned int partition, const unsigned int cluster_size, const bool hp_bool, const std::vector< unsigned int > &cell_partition, const std::vector< unsigned int > &partition_list, const std::vector< unsigned int > &partition_size, std::vector< unsigned int > &partition_partition_list, std::vector< unsigned char > &irregular_cells) |
| void | make_partitioning (const DynamicSparsityPattern &connectivity, const unsigned int cluster_size, std::vector< unsigned int > &cell_partition, std::vector< unsigned int > &partition_list, std::vector< unsigned int > &partition_size, unsigned int &partition) const |
| void | update_task_info (const unsigned int partition) |
| void | create_flow_graph () |
| std::size_t | memory_consumption () const |
| template<typename StreamType > | |
| void | print_memory_statistics (StreamType &out, std::size_t data_length) const |
Public Attributes | |
| unsigned int | n_active_cells |
| unsigned int | n_ghost_cells |
| unsigned int | vectorization_length |
| unsigned int | block_size |
| unsigned int | n_blocks |
| TasksParallelScheme | scheme |
| std::vector< unsigned int > | partition_row_index |
| std::vector< unsigned int > | cell_partition_data |
| std::vector< unsigned int > | face_partition_data |
| std::vector< unsigned int > | boundary_partition_data |
| std::vector< unsigned int > | ghost_face_partition_data |
| std::vector< unsigned int > | refinement_edge_face_partition_data |
| std::vector< unsigned int > | partition_evens |
| std::vector< unsigned int > | partition_odds |
| std::vector< unsigned int > | partition_n_blocked_workers |
| std::vector< unsigned int > | partition_n_workers |
| unsigned int | evens |
| unsigned int | odds |
| unsigned int | n_blocked_workers |
| unsigned int | n_workers |
| std::vector< unsigned char > | task_at_mpi_boundary |
| MPI_Comm | communicator |
| unsigned int | my_pid |
| unsigned int | n_procs |
A struct that collects all information related to parallelization with threads: The work is subdivided into tasks that can be done independently.
Definition at line 102 of file task_info.h.
| internal::MatrixFreeFunctions::TaskInfo::TaskInfo | ( | ) |
Constructor.
Definition at line 625 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::clear | ( | ) |
Clears all the data fields and resets them to zero.
Definition at line 633 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::loop | ( | MFWorkerInterface & | worker | ) | const |
Runs the matrix-free loop.
Definition at line 337 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::collect_boundary_cells | ( | const unsigned int | n_active_cells, |
| const unsigned int | n_active_and_ghost_cells, | ||
| const unsigned int | vectorization_length, | ||
| std::vector< unsigned int > & | boundary_cells | ||
| ) |
Determines the position of cells with ghosts for distributed-memory calculations.
Definition at line 694 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::create_blocks_serial | ( | const std::vector< unsigned int > & | boundary_cells, |
| const std::vector< unsigned int > & | cells_close_to_boundary, | ||
| const unsigned int | dofs_per_cell, | ||
| const std::vector< unsigned int > & | cell_vectorization_categories, | ||
| const bool | cell_vectorization_categories_strict, | ||
| std::vector< unsigned int > & | renumbering, | ||
| std::vector< unsigned char > & | incompletely_filled_vectorization | ||
| ) |
Sets up the blocks for running the cell loop based on the options controlled by the input arguments.
| boundary_cells | A list of cells that need to exchange data prior to performing computations. These will be given a certain id in the partitioning. |
| cells_close_to_boundary | A list of cells that interact with boundaries between different subdomains and are involved in sending data to neighboring processes. |
| dofs_per_cell | Gives an expected value for the number of degrees of freedom on a cell, which is used to determine the block size for interleaving cell and face integrals. |
| cell_vectorization_categories | This set of categories defines the cells that should be grouped together inside the lanes of a vectorized array. This can be the polynomial degree in an hp-element or a user-provided grouping. |
| cell_vectorization_categories_strict | Defines whether the categories defined by the previous variables should be separated strictly or whether it is allowed to insert lower categories into the next high one(s). |
| renumbering | When leaving this function, the vector contains a new numbering of the cells that aligns with the grouping stored in this class. |
| incompletely_filled_vectorization | Given the vectorized layout of this class, some cell batches might have components in the vectorized array (SIMD lanes) that are not used and do not carray valid data. This array indicates the cell batches where this occurs according to the renumbering returned by this function. |
Definition at line 773 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::initial_setup_blocks_tasks | ( | const std::vector< unsigned int > & | boundary_cells, |
| std::vector< unsigned int > & | renumbering, | ||
| std::vector< unsigned char > & | incompletely_filled_vectorization | ||
| ) |
First step in the block creation for the task-parallel blocking setup.
| boundary_cells | A list of cells that need to exchange data prior to performing computations. These will be given a certain id in the partitioning. |
| renumbering | When leaving this function, the vector contains a new numbering of the cells that aligns with the grouping stored in this class (before actually creating the tasks). |
| incompletely_filled_vectorization | Given the vectorized layout of this class, some cell batches might have components in the vectorized array (SIMD lanes) that are not used and do not carray valid data. This array indicates the cell batches where this occurs according to the renumbering returned by this function. |
Definition at line 971 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::guess_block_size | ( | const unsigned int | dofs_per_cell | ) |
This helper function determines a block size if the user decided not to force a block size through MatrixFree::AdditionalData. This is computed based on the number of hardware threads on the system and the number of macro cells that we should work on.
Definition at line 1037 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_thread_graph_partition_color | ( | DynamicSparsityPattern & | connectivity, |
| std::vector< unsigned int > & | renumbering, | ||
| std::vector< unsigned char > & | irregular_cells, | ||
| const bool | hp_bool | ||
| ) |
This method goes through all cells that have been filled into dof_indices and finds out which cells can be worked on independently and which ones are neighboring and need to be done at different times when used in parallel.
The strategy is based on a two-level approach. The outer level is subdivided into partitions similar to the type of neighbors in Cuthill-McKee, and the inner level is subdivided via colors (for chunks within the same color, can work independently). One task is represented by a chunk of cells. The cell chunks are formed before subdivision into partitions and colors.
| cell_active_fe_index | The active FE index corresponding to the individual indices in the list of all cell indices, in order to be able to not place cells with different indices into the same cell batch with vectorization. |
| connectivity | (in/out) Determines whether cells i and j are conflicting, expressed by an entry in position (i,j). |
| renumbering | (in/out) At output, the element j of this variable gives the original number of the cell that is reordered to place j by the ordering due to the thread graph. |
| irregular_cells | (in/out) Informs the current function whether some SIMD lanes in VectorizedArray would not be filled for a given cell batch index. |
| hp_bool | Defines whether we are in hp mode or not |
Definition at line 1064 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_thread_graph_partition_partition | ( | const std::vector< unsigned int > & | cell_active_fe_index, |
| DynamicSparsityPattern & | connectivity, | ||
| std::vector< unsigned int > & | renumbering, | ||
| std::vector< unsigned char > & | irregular_cells, | ||
| const bool | hp_bool | ||
| ) |
This function goes through all cells that have been filled into dof_indices and finds out which cells can be worked on independently and which ones are neighboring and need to be done at different times when used in parallel.
The strategy is based on a two-level approach. The outer level is subdivided into partitions similar to the type of neighbors in Cuthill-McKee, and the inner level is again subdivided into Cuthill- McKee-like partitions (partitions whose level differs by more than 2 can be worked on independently). One task is represented by a chunk of cells. The cell chunks are formed after subdivision into the two levels of partitions.
| cell_active_fe_index | The active FE index corresponding to the individual indices in the list of all cell indices, in order to be able to not place cells with different indices into the same cell batch with vectorization. |
| connectivity | (in/out) Determines whether cells i and j are conflicting, expressed by an entry in position (i,j). |
| renumbering | (in/out) At output, the element j of this variable gives the original number of the cell that is reordered to place j by the ordering due to the thread graph. |
| irregular_cells | (in/out) Informs the current function whether some SIMD lanes in VectorizedArray would not be filled for a given cell batch index. |
| hp_bool | Defines whether we are in hp mode or not |
Definition at line 1406 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_thread_graph | ( | const std::vector< unsigned int > & | cell_active_fe_index, |
| DynamicSparsityPattern & | connectivity, | ||
| std::vector< unsigned int > & | renumbering, | ||
| std::vector< unsigned char > & | irregular_cells, | ||
| const bool | hp_bool | ||
| ) |
Either calls make_thread_graph_partition_color() or make_thread_graph_partition_partition() accessible from the outside, depending on the setting in the data structure.
| cell_active_fe_index | The active FE index corresponding to the individual indices in the list of all cell indices, in order to be able to not place cells with different indices into the same cell batch with vectorization. |
| connectivity | (in/out) Determines whether cells i and j are conflicting, expressed by an entry in position (i,j). |
| renumbering | (in/out) At output, the element j of this variable gives the original number of the cell that is reordered to place j by the ordering due to the thread graph. |
| irregular_cells | (in/out) Informs the current function whether some SIMD lanes in VectorizedArray would not be filled for a given cell batch index. |
| hp_bool | Defines whether we are in hp mode or not |
Definition at line 1211 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_connectivity_cells_to_blocks | ( | const std::vector< unsigned char > & | irregular_cells, |
| const DynamicSparsityPattern & | connectivity_cells, | ||
| DynamicSparsityPattern & | connectivity_blocks | ||
| ) | const |
This function computes the connectivity between blocks of cells from the connectivity between the individual cells.
Definition at line 1474 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_coloring_within_partitions_pre_blocked | ( | const DynamicSparsityPattern & | connectivity, |
| const unsigned int | partition, | ||
| const std::vector< unsigned int > & | cell_partition, | ||
| const std::vector< unsigned int > & | partition_list, | ||
| const std::vector< unsigned int > & | partition_size, | ||
| std::vector< unsigned int > & | partition_color_list | ||
| ) |
Function to create coloring on the second layer within each partition.
Definition at line 1844 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_partitioning_within_partitions_post_blocked | ( | const DynamicSparsityPattern & | connectivity, |
| const std::vector< unsigned int > & | cell_active_fe_index, | ||
| const unsigned int | partition, | ||
| const unsigned int | cluster_size, | ||
| const bool | hp_bool, | ||
| const std::vector< unsigned int > & | cell_partition, | ||
| const std::vector< unsigned int > & | partition_list, | ||
| const std::vector< unsigned int > & | partition_size, | ||
| std::vector< unsigned int > & | partition_partition_list, | ||
| std::vector< unsigned char > & | irregular_cells | ||
| ) |
Function to create partitioning on the second layer within each partition.
Definition at line 1518 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::make_partitioning | ( | const DynamicSparsityPattern & | connectivity, |
| const unsigned int | cluster_size, | ||
| std::vector< unsigned int > & | cell_partition, | ||
| std::vector< unsigned int > & | partition_list, | ||
| std::vector< unsigned int > & | partition_size, | ||
| unsigned int & | partition | ||
| ) | const |
This function creates partitions according to the provided connectivity graph.
| connectivity | Connectivity between (blocks of cells) |
| cluster_size | The number of cells in each partition should be a multiple of cluster_size (for blocking later on) |
| cell_partition | Saves of each (block of cells) to which partition the block belongs |
| partition_list | partition_list[j] gives the old number of the block that should be renumbered to j due to the partitioning |
| partition_size | Vector pointing to start of each partition (on output) |
| partition | number of partitions created |
Definition at line 1920 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::update_task_info | ( | const unsigned int | partition | ) |
Update fields of task info for task graph set up in make_thread_graph.
Definition at line 2152 of file task_info.cc.
| void internal::MatrixFreeFunctions::TaskInfo::create_flow_graph | ( | ) |
Creates a task graph from a connectivity structure.
| std::size_t internal::MatrixFreeFunctions::TaskInfo::memory_consumption | ( | ) | const |
Returns the memory consumption of the class.
Definition at line 677 of file task_info.cc.
| template void internal::MatrixFreeFunctions::TaskInfo::print_memory_statistics< ConditionalOStream > | ( | StreamType & | out, |
| std::size_t | data_length | ||
| ) | const |
Prints minimum, average, and maximal memory consumption over the MPI processes.
Definition at line 662 of file task_info.cc.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::n_active_cells |
Number of physical cells in the mesh, not cell batches after vectorization
Definition at line 429 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::n_ghost_cells |
Number of physical ghost cells in the mesh which are subject to special treatment and should not be included in loops
Definition at line 435 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::vectorization_length |
Number of lanes in the SIMD array that are used for vectorization
Definition at line 440 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::block_size |
Block size information for multithreading
Definition at line 445 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::n_blocks |
Number of blocks for multithreading
Definition at line 450 of file task_info.h.
| TasksParallelScheme internal::MatrixFreeFunctions::TaskInfo::scheme |
Parallel scheme applied by multithreading
Definition at line 455 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::partition_row_index |
The blocks are organized by a vector-of-vector concept, and this data field partition_row_index stores the distance from one 'vector' to the next within the linear storage of all data to the two-level partitioning.
Definition at line 463 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::cell_partition_data |
This is a linear storage of all partitions, building a range of indices of the form cell_partition_data[idx] to cell_partition_data[idx+1] within the integer list of all cells in MatrixFree, subdivided into chunks by partition_row_index.
Definition at line 471 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::face_partition_data |
This is a linear storage of all partitions of inner faces, building a range of indices of the form face_partition_data[idx] to face_partition_data[idx+1] within the integer list of all interior faces in MatrixFree, subdivided into chunks by partition_row_index.
Definition at line 480 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::boundary_partition_data |
This is a linear storage of all partitions of boundary faces, building a range of indices of the form boundary_partition_data[idx] to boundary_partition_data[idx+1] within the integer list of all boundary faces in MatrixFree, subdivided into chunks by partition_row_index.
Definition at line 489 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::ghost_face_partition_data |
This is a linear storage of all partitions of interior faces on boundaries to other processors that are not locally used, building a range of indices of the form ghost_face_partition_data[idx] to ghost_face_partition_data[idx+1] within the integer list of all such faces in MatrixFree, subdivided into chunks by partition_row_index.
Definition at line 499 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::refinement_edge_face_partition_data |
This is a linear storage of all partitions of faces for multigrid levels that have a coarser neighbor and are only included in certain residual computations but not in smoothing, building a range of indices of the form refinement_edge_face_partition_data[idx] to refinement_edge_face_partition_data[idx+1] within the integer list of all such faces in MatrixFree, subdivided into chunks by partition_row_index.
Definition at line 510 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::partition_evens |
Thread information (which chunk to start 'even' partitions from) to be handed to the dynamic task scheduler
Definition at line 516 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::partition_odds |
Thread information (which chunk to start 'odd' partitions from) to be handed to the dynamic task scheduler
Definition at line 522 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::partition_n_blocked_workers |
Thread information regarding the dependencies for partitions handed to the dynamic task scheduler
Definition at line 528 of file task_info.h.
| std::vector<unsigned int> internal::MatrixFreeFunctions::TaskInfo::partition_n_workers |
Thread information regarding the dependencies for partitions handed to the dynamic task scheduler
Definition at line 534 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::evens |
Number of even partitions accumulated over the field partitions_even
Definition at line 540 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::odds |
Number of odd partitions accumulated over the field partitions_odd
Definition at line 546 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::n_blocked_workers |
Number of blocked workers accumulated over the field partition_n_blocked_workers
Definition at line 552 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::n_workers |
Number of workers accumulated over the field partition_n_workers
Definition at line 557 of file task_info.h.
| std::vector<unsigned char> internal::MatrixFreeFunctions::TaskInfo::task_at_mpi_boundary |
Stores whether a particular task is at an MPI boundary and needs data exchange
Definition at line 563 of file task_info.h.
| MPI_Comm internal::MatrixFreeFunctions::TaskInfo::communicator |
MPI communicator
Definition at line 568 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::my_pid |
Rank of MPI process
Definition at line 573 of file task_info.h.
| unsigned int internal::MatrixFreeFunctions::TaskInfo::n_procs |
Number of MPI rank for the current communicator
Definition at line 578 of file task_info.h.
1.8.11
