NAME¶

__gnu_parallel::_Settings -

SYNOPSIS¶

Static Public Member Functions¶

static const _Settings & get () throw () static void set (_Settings &) throw ()

Public Attributes¶

_SequenceIndex accumulate_minimal_n unsigned int adjacent_difference_minimal_n _AlgorithmStrategy algorithm_strategy unsigned int cache_line_size _SequenceIndex count_minimal_n _SequenceIndex fill_minimal_n _FindAlgorithm find_algorithm double find_increasing_factor _SequenceIndex find_initial_block_size _SequenceIndex find_maximum_block_size float find_scale_factor _SequenceIndex find_sequential_search_size _SequenceIndex for_each_minimal_n _SequenceIndex generate_minimal_n unsigned long long L1_cache_size unsigned long long L2_cache_size _SequenceIndex max_element_minimal_n _SequenceIndex merge_minimal_n unsigned int merge_oversampling _SplittingAlgorithm merge_splitting _SequenceIndex min_element_minimal_n _MultiwayMergeAlgorithm multiway_merge_algorithm int multiway_merge_minimal_k _SequenceIndex multiway_merge_minimal_n unsigned int multiway_merge_oversampling _SplittingAlgorithm multiway_merge_splitting _SequenceIndex nth_element_minimal_n _SequenceIndex partial_sort_minimal_n _PartialSumAlgorithm partial_sum_algorithm float partial_sum_dilation unsigned int partial_sum_minimal_n double partition_chunk_share _SequenceIndex partition_chunk_size _SequenceIndex partition_minimal_n _SequenceIndex qsb_steals unsigned int random_shuffle_minimal_n _SequenceIndex replace_minimal_n _SequenceIndex search_minimal_n _SequenceIndex set_difference_minimal_n _SequenceIndex set_intersection_minimal_n _SequenceIndex set_symmetric_difference_minimal_n _SequenceIndex set_union_minimal_n _SortAlgorithm sort_algorithm _SequenceIndex sort_minimal_n unsigned int sort_mwms_oversampling unsigned int sort_qs_num_samples_preset _SequenceIndex sort_qsb_base_case_maximal_n _SplittingAlgorithm sort_splitting unsigned int TLB_size _SequenceIndex transform_minimal_n _SequenceIndex unique_copy_minimal_n _SequenceIndex workstealing_chunk_size

Detailed Description¶

class _Settings Run-time settings for the parallel mode including all tunable parameters. Definition at line 123 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::__parallel_nth_element(), __gnu_parallel::__parallel_partial_sum(), __gnu_parallel::__parallel_partial_sum_linear(), __gnu_parallel::__parallel_partition(), __gnu_parallel::__parallel_random_shuffle_drs(), __gnu_parallel::__parallel_sort(), __gnu_parallel::__parallel_sort_qs_conquer(), __gnu_parallel::__qsb_local_sort_with_helping(), __gnu_parallel::__sequential_random_shuffle(), __gnu_parallel::multiway_merge_sampling_splitting(), __gnu_parallel::parallel_multiway_merge(), __gnu_parallel::parallel_sort_mwms(), and __gnu_parallel::parallel_sort_mwms_pu().

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

Set the global settings.

Member Data Documentation¶

_SequenceIndex __gnu_parallel::_Settings::accumulate_minimal_n¶

Minimal input size for accumulate. Definition at line 139 of file settings.h.

unsigned int __gnu_parallel::_Settings::adjacent_difference_minimal_n¶

Minimal input size for adjacent_difference. Definition at line 142 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 265 of file settings.h. Referenced by __gnu_parallel::__for_each_template_random_access_workstealing().

_SequenceIndex __gnu_parallel::_Settings::count_minimal_n¶

Minimal input size for count and count_if. Definition at line 145 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::fill_minimal_n¶

Minimal input size for fill. Definition at line 148 of file settings.h.

double __gnu_parallel::_Settings::find_increasing_factor¶

Block size increase factor for find. Definition at line 151 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::find_initial_block_size¶

Initial block size for find. Definition at line 154 of file settings.h. Referenced by __gnu_parallel::__find_template().

_SequenceIndex __gnu_parallel::_Settings::find_maximum_block_size¶

Maximal block size for find. Definition at line 157 of file settings.h.

float __gnu_parallel::_Settings::find_scale_factor¶

Block size scale-down factor with respect to current position. Definition at line 276 of file settings.h. Referenced by __gnu_parallel::__find_template().

_SequenceIndex __gnu_parallel::_Settings::find_sequential_search_size¶

Start with looking for this many elements sequentially, for find. Definition at line 160 of file settings.h. Referenced by __gnu_parallel::__find_template().

_SequenceIndex __gnu_parallel::_Settings::for_each_minimal_n¶

Minimal input size for for_each. Definition at line 163 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::generate_minimal_n¶

Minimal input size for generate. Definition at line 166 of file settings.h.

unsigned long long __gnu_parallel::_Settings::L1_cache_size¶

size of the L1 cache in bytes (underestimation). Definition at line 254 of file settings.h.

unsigned long long __gnu_parallel::_Settings::L2_cache_size¶

size of the L2 cache in bytes (underestimation). Definition at line 257 of file settings.h. Referenced by __gnu_parallel::__parallel_random_shuffle_drs(), and __gnu_parallel::__sequential_random_shuffle().

_SequenceIndex __gnu_parallel::_Settings::max_element_minimal_n¶

Minimal input size for max_element. Definition at line 169 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::merge_minimal_n¶

Minimal input size for merge. Definition at line 172 of file settings.h.

unsigned int __gnu_parallel::_Settings::merge_oversampling¶

Oversampling factor for merge. Definition at line 175 of file settings.h. Referenced by __gnu_parallel::multiway_merge_sampling_splitting(), and __gnu_parallel::parallel_multiway_merge().

_SequenceIndex __gnu_parallel::_Settings::min_element_minimal_n¶

Minimal input size for min_element. Definition at line 178 of file settings.h.

int __gnu_parallel::_Settings::multiway_merge_minimal_k¶

Oversampling factor for multiway_merge. Definition at line 184 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::multiway_merge_minimal_n¶

Minimal input size for multiway_merge. Definition at line 181 of file settings.h.

unsigned int __gnu_parallel::_Settings::multiway_merge_oversampling¶

Oversampling factor for multiway_merge. Definition at line 187 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::nth_element_minimal_n¶

Minimal input size for nth_element. Definition at line 190 of file settings.h. Referenced by __gnu_parallel::__parallel_nth_element().

_SequenceIndex __gnu_parallel::_Settings::partial_sort_minimal_n¶

Minimal input size for partial_sort. Definition at line 203 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 207 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 210 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 197 of file settings.h. Referenced by __gnu_parallel::__parallel_partition().

_SequenceIndex __gnu_parallel::_Settings::partition_chunk_size¶

Chunk size for partition. Definition at line 193 of file settings.h. Referenced by __gnu_parallel::__parallel_partition().

_SequenceIndex __gnu_parallel::_Settings::partition_minimal_n¶

Minimal input size for partition. Definition at line 200 of file settings.h. Referenced by __gnu_parallel::__parallel_nth_element().

_SequenceIndex __gnu_parallel::_Settings::qsb_steals¶

The number of stolen ranges in load-balanced quicksort. Definition at line 270 of file settings.h.

unsigned int __gnu_parallel::_Settings::random_shuffle_minimal_n¶

Minimal input size for random_shuffle. Definition at line 213 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::replace_minimal_n¶

Minimal input size for replace and replace_if. Definition at line 216 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::search_minimal_n¶

Minimal input size for search and search_n. Definition at line 273 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::set_difference_minimal_n¶

Minimal input size for set_difference. Definition at line 219 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::set_intersection_minimal_n¶

Minimal input size for set_intersection. Definition at line 222 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::set_symmetric_difference_minimal_n¶

Minimal input size for set_symmetric_difference. Definition at line 225 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::set_union_minimal_n¶

Minimal input size for set_union. Definition at line 228 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::sort_minimal_n¶

Minimal input size for parallel sorting. Definition at line 231 of file settings.h.

unsigned int __gnu_parallel::_Settings::sort_mwms_oversampling¶

Oversampling factor for parallel std::sort (MWMS). Definition at line 234 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 237 of file settings.h.

_SequenceIndex __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 241 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 260 of file settings.h. Referenced by __gnu_parallel::__parallel_random_shuffle_drs(), and __gnu_parallel::__sequential_random_shuffle().

_SequenceIndex __gnu_parallel::_Settings::transform_minimal_n¶

Minimal input size for parallel std::transform. Definition at line 244 of file settings.h.

_SequenceIndex __gnu_parallel::_Settings::unique_copy_minimal_n¶

Minimal input size for unique_copy. Definition at line 247 of file settings.h.

Author¶

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