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__gnu_parallel::_Settings.3cxx

NAME

__gnu_parallel::_Settings -

class _Settings /// Run-time settings for the parallel mode, including all tunable parameters.

SYNOPSIS

Static Public Member Functions

static const _Settings & get () throw ()

static void set (_Settings &) throw ()

Public Attributes

sequence_index_t accumulate_minimal_n

unsigned int adjacent_difference_minimal_n

_AlgorithmStrategy algorithm_strategy

unsigned int cache_line_size

sequence_index_t count_minimal_n

sequence_index_t fill_minimal_n

_FindAlgorithm find_algorithm

double find_increasing_factor

sequence_index_t find_initial_block_size

sequence_index_t find_maximum_block_size

sequence_index_t find_sequential_search_size

sequence_index_t for_each_minimal_n

sequence_index_t generate_minimal_n

unsigned long long L1_cache_size

unsigned long long L2_cache_size

sequence_index_t max_element_minimal_n

sequence_index_t merge_minimal_n

unsigned int merge_oversampling

_SplittingAlgorithm merge_splitting

sequence_index_t min_element_minimal_n

_MultiwayMergeAlgorithm multiway_merge_algorithm

int multiway_merge_minimal_k

sequence_index_t multiway_merge_minimal_n

unsigned int multiway_merge_oversampling

_SplittingAlgorithm multiway_merge_splitting

sequence_index_t nth_element_minimal_n

sequence_index_t partial_sort_minimal_n

_PartialSumAlgorithm partial_sum_algorithm

float partial_sum_dilation

unsigned int partial_sum_minimal_n

double partition_chunk_share

sequence_index_t partition_chunk_size

sequence_index_t partition_minimal_n

sequence_index_t qsb_steals

unsigned int random_shuffle_minimal_n

sequence_index_t replace_minimal_n

sequence_index_t set_difference_minimal_n

sequence_index_t set_intersection_minimal_n

sequence_index_t set_symmetric_difference_minimal_n

sequence_index_t set_union_minimal_n

_SortAlgorithm sort_algorithm

sequence_index_t sort_minimal_n

unsigned int sort_mwms_oversampling

unsigned int sort_qs_num_samples_preset

sequence_index_t sort_qsb_base_case_maximal_n

_SplittingAlgorithm sort_splitting

unsigned int TLB_size

sequence_index_t transform_minimal_n

sequence_index_t unique_copy_minimal_n

sequence_index_t workstealing_chunk_size

Detailed Description

class _Settings /// Run-time settings for the parallel mode, including all tunable parameters.

Definition at line 118 of file settings.h.

Member Function Documentation

static const _Settings& __gnu_parallel::_Settings::get () throw () [static]

Get the global settings.

Referenced by __gnu_parallel::find_template(), __gnu_parallel::for_each_template_random_access_workstealing(), __gnu_parallel::multiway_merge_sampling_splitting(), __gnu_parallel::parallel_multiway_merge(), __gnu_parallel::parallel_nth_element(), __gnu_parallel::parallel_partial_sum(), __gnu_parallel::parallel_partial_sum_linear(), __gnu_parallel::parallel_partition(), __gnu_parallel::parallel_sort(), __gnu_parallel::parallel_sort_mwms(), __gnu_parallel::parallel_sort_mwms_pu(), __gnu_parallel::parallel_sort_qs_conquer(), and __gnu_parallel::qsb_local_sort_with_helping().

static void __gnu_parallel::_Settings::set (_Settings &) throw () [static]

Set the global settings.

Member Data Documentation

sequence_index_t __gnu_parallel::_Settings::accumulate_minimal_n

Minimal input size for accumulate.

Definition at line 134 of file settings.h.

unsigned int __gnu_parallel::_Settings::adjacent_difference_minimal_n

Minimal input size for adjacent_difference.

Definition at line 137 of file settings.h.

unsigned int __gnu_parallel::_Settings::cache_line_size

Overestimation of cache line size. Used to avoid false /// sharing, i. e. elements of different threads are at least this /// amount apart.

Definition at line 260 of file settings.h.

Referenced by __gnu_parallel::for_each_template_random_access_workstealing().

sequence_index_t __gnu_parallel::_Settings::count_minimal_n

Minimal input size for count and count_if.

Definition at line 140 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::fill_minimal_n

Minimal input size for fill.

Definition at line 143 of file settings.h.

double __gnu_parallel::_Settings::find_increasing_factor

Block size increase factor for find.

Definition at line 146 of file settings.h.

Referenced by __gnu_parallel::find_template().

sequence_index_t __gnu_parallel::_Settings::find_initial_block_size

Initial block size for find.

Definition at line 149 of file settings.h.

Referenced by __gnu_parallel::find_template().

sequence_index_t __gnu_parallel::_Settings::find_maximum_block_size

Maximal block size for find.

Definition at line 152 of file settings.h.

Referenced by __gnu_parallel::find_template().

sequence_index_t __gnu_parallel::_Settings::find_sequential_search_size

Start with looking for this many elements sequentially, for find.

Definition at line 155 of file settings.h.

Referenced by __gnu_parallel::find_template().

sequence_index_t __gnu_parallel::_Settings::for_each_minimal_n

Minimal input size for for_each.

Definition at line 158 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::generate_minimal_n

Minimal input size for generate.

Definition at line 161 of file settings.h.

unsigned long long __gnu_parallel::_Settings::L1_cache_size

Size of the L1 cache in bytes (underestimation).

Definition at line 249 of file settings.h.

unsigned long long __gnu_parallel::_Settings::L2_cache_size

Size of the L2 cache in bytes (underestimation).

Definition at line 252 of file settings.h.

Referenced by __gnu_parallel::parallel_random_shuffle_drs(), and __gnu_parallel::sequential_random_shuffle().

sequence_index_t __gnu_parallel::_Settings::max_element_minimal_n

Minimal input size for max_element.

Definition at line 164 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::merge_minimal_n

Minimal input size for merge.

Definition at line 167 of file settings.h.

unsigned int __gnu_parallel::_Settings::merge_oversampling

Oversampling factor for merge.

Definition at line 170 of file settings.h.

Referenced by __gnu_parallel::multiway_merge_sampling_splitting(), and __gnu_parallel::parallel_multiway_merge().

sequence_index_t __gnu_parallel::_Settings::min_element_minimal_n

Minimal input size for min_element.

Definition at line 173 of file settings.h.

int __gnu_parallel::_Settings::multiway_merge_minimal_k

Oversampling factor for multiway_merge.

Definition at line 179 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::multiway_merge_minimal_n

Minimal input size for multiway_merge.

Definition at line 176 of file settings.h.

unsigned int __gnu_parallel::_Settings::multiway_merge_oversampling

Oversampling factor for multiway_merge.

Definition at line 182 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::nth_element_minimal_n

Minimal input size for nth_element.

Definition at line 185 of file settings.h.

Referenced by __gnu_parallel::parallel_nth_element().

sequence_index_t __gnu_parallel::_Settings::partial_sort_minimal_n

Minimal input size for partial_sort.

Definition at line 198 of file settings.h.

float __gnu_parallel::_Settings::partial_sum_dilation

Ratio for partial_sum. Assume 'sum and write result' to be /// this factor slower than just 'sum'.

Definition at line 202 of file settings.h.

Referenced by __gnu_parallel::parallel_partial_sum_linear().

unsigned int __gnu_parallel::_Settings::partial_sum_minimal_n

Minimal input size for partial_sum.

Definition at line 205 of file settings.h.

double __gnu_parallel::_Settings::partition_chunk_share

Chunk size for partition, relative to input size. If > 0.0, /// this value overrides partition_chunk_size.

Definition at line 192 of file settings.h.

Referenced by __gnu_parallel::parallel_partition().

sequence_index_t __gnu_parallel::_Settings::partition_chunk_size

Chunk size for partition.

Definition at line 188 of file settings.h.

Referenced by __gnu_parallel::parallel_partition().

sequence_index_t __gnu_parallel::_Settings::partition_minimal_n

Minimal input size for partition.

Definition at line 195 of file settings.h.

Referenced by __gnu_parallel::parallel_nth_element().

sequence_index_t __gnu_parallel::_Settings::qsb_steals

The number of stolen ranges in load-balanced quicksort.

Definition at line 265 of file settings.h.

unsigned int __gnu_parallel::_Settings::random_shuffle_minimal_n

Minimal input size for random_shuffle.

Definition at line 208 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::replace_minimal_n

Minimal input size for replace and replace_if.

Definition at line 211 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::set_difference_minimal_n

Minimal input size for set_difference.

Definition at line 214 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::set_intersection_minimal_n

Minimal input size for set_intersection.

Definition at line 217 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::set_symmetric_difference_minimal_n

Minimal input size for set_symmetric_difference.

Definition at line 220 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::set_union_minimal_n

Minimal input size for set_union.

Definition at line 223 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::sort_minimal_n

Minimal input size for parallel sorting.

Definition at line 226 of file settings.h.

unsigned int __gnu_parallel::_Settings::sort_mwms_oversampling

Oversampling factor for parallel std::sort (MWMS).

Definition at line 229 of file settings.h.

Referenced by __gnu_parallel::parallel_sort_mwms(), and __gnu_parallel::parallel_sort_mwms_pu().

unsigned int __gnu_parallel::_Settings::sort_qs_num_samples_preset

Such many samples to take to find a good pivot (quicksort).

Definition at line 232 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::sort_qsb_base_case_maximal_n

Maximal subsequence length to switch to unbalanced base case. /// Applies to std::sort with dynamically load-balanced quicksort.

Definition at line 236 of file settings.h.

Referenced by __gnu_parallel::qsb_local_sort_with_helping().

unsigned int __gnu_parallel::_Settings::TLB_size

Size of the Translation Lookaside Buffer (underestimation).

Definition at line 255 of file settings.h.

Referenced by __gnu_parallel::parallel_random_shuffle_drs(), and __gnu_parallel::sequential_random_shuffle().

sequence_index_t __gnu_parallel::_Settings::transform_minimal_n

Minimal input size for parallel std::transform.

Definition at line 239 of file settings.h.

sequence_index_t __gnu_parallel::_Settings::unique_copy_minimal_n

Minimal input size for unique_copy.

Definition at line 242 of file settings.h.

Author

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