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 122 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::__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::__qsb_local_sort_with_helping(),
       __gnu_parallel::__sequential_random_shuffle(),
       __gnu_parallel::multiway_merge_sampling_splitting(), __gnu_parallel::parallel_sort_mwms(),
       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 138 of file settings.h.

   unsigned int __gnu_parallel::_Settings::adjacent_difference_minimal_n
       Minimal input size for adjacent_difference.

       Definition at line 141 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 264 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 144 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::fill_minimal_n
       Minimal input size for fill.

       Definition at line 147 of file settings.h.

   double __gnu_parallel::_Settings::find_increasing_factor
       Block size increase factor for find.

       Definition at line 150 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::find_initial_block_size
       Initial block size for find.

       Definition at line 153 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 156 of file settings.h.

   float __gnu_parallel::_Settings::find_scale_factor
       Block size scale-down factor with respect to current position.

       Definition at line 275 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 159 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 162 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::generate_minimal_n
       Minimal input size for generate.

       Definition at line 165 of file settings.h.

   unsigned long long __gnu_parallel::_Settings::L1_cache_size
       size of the L1 cache in bytes (underestimation).

       Definition at line 253 of file settings.h.

   unsigned long long __gnu_parallel::_Settings::L2_cache_size
       size of the L2 cache in bytes (underestimation).

       Definition at line 256 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 168 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::merge_minimal_n
       Minimal input size for merge.

       Definition at line 171 of file settings.h.

   unsigned int __gnu_parallel::_Settings::merge_oversampling
       Oversampling factor for merge.

       Definition at line 174 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 177 of file settings.h.

   int __gnu_parallel::_Settings::multiway_merge_minimal_k
       Oversampling factor for multiway_merge.

       Definition at line 183 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::multiway_merge_minimal_n
       Minimal input size for multiway_merge.

       Definition at line 180 of file settings.h.

   unsigned int __gnu_parallel::_Settings::multiway_merge_oversampling
       Oversampling factor for multiway_merge.

       Definition at line 186 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::nth_element_minimal_n
       Minimal input size for nth_element.

       Definition at line 189 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 202 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 206 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 209 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 196 of file settings.h.

       Referenced by __gnu_parallel::__parallel_partition().

   _SequenceIndex __gnu_parallel::_Settings::partition_chunk_size
       Chunk size for partition.

       Definition at line 192 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 199 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 269 of file settings.h.

   unsigned int __gnu_parallel::_Settings::random_shuffle_minimal_n
       Minimal input size for random_shuffle.

       Definition at line 212 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::replace_minimal_n
       Minimal input size for replace and replace_if.

       Definition at line 215 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::search_minimal_n
       Minimal input size for search and search_n.

       Definition at line 272 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::set_difference_minimal_n
       Minimal input size for set_difference.

       Definition at line 218 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::set_intersection_minimal_n
       Minimal input size for set_intersection.

       Definition at line 221 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::set_symmetric_difference_minimal_n
       Minimal input size for set_symmetric_difference.

       Definition at line 224 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::set_union_minimal_n
       Minimal input size for set_union.

       Definition at line 227 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::sort_minimal_n
       Minimal input size for parallel sorting.

       Definition at line 230 of file settings.h.

   unsigned int __gnu_parallel::_Settings::sort_mwms_oversampling
       Oversampling factor for parallel std::sort (MWMS).

       Definition at line 233 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 236 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 240 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 259 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 243 of file settings.h.

   _SequenceIndex __gnu_parallel::_Settings::unique_copy_minimal_n
       Minimal input size for unique_copy.

       Definition at line 246 of file settings.h.

Author

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