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__GNU_PARALLEL::_SETTINGS(3CXX) - Linux man page online | Library functions

Class _Settings Run-time settings for the parallel mode including all tunable.

Chapter
Tue Mar 10 2020
__gnu_parallel::_Settings(3cxx) __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 () Get the global settings. static void set (_Settings &) throw () Set the global settings. Public Attributes _SequenceIndex accumulate_minimal_n Minimal input size for accumulate. unsigned int adjacent_difference_minimal_n Minimal input size for adjacent_difference. _AlgorithmStrategy algorithm_strategy unsigned int 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. _SequenceIndex count_minimal_n Minimal input size for count and count_if. _SequenceIndex fill_minimal_n Minimal input size for fill. _FindAlgorithm find_algorithm double find_increasing_factor Block size increase factor for find. _SequenceIndex find_initial_block_size Initial block size for find. _SequenceIndex find_maximum_block_size Maximal block size for find. float find_scale_factor Block size scale-down factor with respect to current position. _SequenceIndex find_sequential_search_size Start with looking for this many elements sequentially, for find. _SequenceIndex for_each_minimal_n Minimal input size for for_each. _SequenceIndex generate_minimal_n Minimal input size for generate. unsigned long long L1_cache_size size of the L1 cache in bytes (underestimation). unsigned long long L2_cache_size size of the L2 cache in bytes (underestimation). _SequenceIndex max_element_minimal_n Minimal input size for max_element. _SequenceIndex merge_minimal_n Minimal input size for merge. unsigned int merge_oversampling Oversampling factor for merge. _SplittingAlgorithm merge_splitting _SequenceIndex min_element_minimal_n Minimal input size for min_element. _MultiwayMergeAlgorithm multiway_merge_algorithm int multiway_merge_minimal_k Oversampling factor for multiway_merge. _SequenceIndex multiway_merge_minimal_n Minimal input size for multiway_merge. unsigned int multiway_merge_oversampling Oversampling factor for multiway_merge. _SplittingAlgorithm multiway_merge_splitting _SequenceIndex nth_element_minimal_n Minimal input size for nth_element. _SequenceIndex partial_sort_minimal_n Minimal input size for partial_sort. _PartialSumAlgorithm partial_sum_algorithm float partial_sum_dilation Ratio for partial_sum. Assume 'sum and write result' to be this factor slower than just 'sum'. unsigned int partial_sum_minimal_n Minimal input size for partial_sum. double partition_chunk_share Chunk size for partition, relative to input size. If > 0.0, this value overrides partition_chunk_size. _SequenceIndex partition_chunk_size Chunk size for partition. _SequenceIndex partition_minimal_n Minimal input size for partition. _SequenceIndex qsb_steals The number of stolen ranges in load-balanced quicksort. unsigned int random_shuffle_minimal_n Minimal input size for random_shuffle. _SequenceIndex replace_minimal_n Minimal input size for replace and replace_if. _SequenceIndex search_minimal_n Minimal input size for search and search_n. _SequenceIndex set_difference_minimal_n Minimal input size for set_difference. _SequenceIndex set_intersection_minimal_n Minimal input size for set_intersection. _SequenceIndex set_symmetric_difference_minimal_n Minimal input size for set_symmetric_difference. _SequenceIndex set_union_minimal_n Minimal input size for set_union. _SortAlgorithm sort_algorithm _SequenceIndex sort_minimal_n Minimal input size for parallel sorting. unsigned int sort_mwms_oversampling Oversampling factor for parallel std::sort (MWMS). unsigned int sort_qs_num_samples_preset Such many samples to take to find a good pivot (quicksort). _SequenceIndex sort_qsb_base_case_maximal_n Maximal subsequence __length to switch to unbalanced __base case. Applies to std::sort with dynamically load-balanced quicksort. _SplittingAlgorithm sort_splitting unsigned int TLB_size size of the Translation Lookaside Buffer (underestimation). _SequenceIndex transform_minimal_n Minimal input size for parallel std::transform. _SequenceIndex unique_copy_minimal_n Minimal input size for unique_copy. _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 () [static] Get the global settings. Referenced by __gnu_parallel::__find_template(), __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::__qsb_local_sort_with_helping(), __gnu_parallel::__sequential_random_shuffle(), __gnu_parallel::multiway_merge(), __gnu_parallel::multiway_merge_sampling_splitting(), __gnu_parallel::multiway_merge_sentinels(), and __gnu_parallel::parallel_sort_mwms_pu(). static void __gnu_parallel::_Settings::set (_Settings &) [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. _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(). _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_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 Generated automatically by Doxygen for libstdc++ from the source code.
libstdc++ Tue Mar 10 2020 __gnu_parallel::_Settings(3cxx)
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