NAME

       __gnu_parallel::_Settings - class _Settings Run-time settings for the parallel mode
       including all tunable parameters.

SYNOPSIS

       #include <settings.h>

   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.

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.

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

   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.

       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.

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

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

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

       Referenced by __gnu_parallel::__find_template().

   _SequenceIndex __gnu_parallel::_Settings::find_maximum_block_size
       Maximal block size for find.

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

       Referenced by __gnu_parallel::__find_template().

   _SequenceIndex __gnu_parallel::_Settings::find_sequential_search_size
       Start with looking for this many elements sequentially, for find.

       Referenced by __gnu_parallel::__find_template().

   _SequenceIndex __gnu_parallel::_Settings::for_each_minimal_n
       Minimal input size for for_each.

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

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

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

       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.

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

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

       Referenced by __gnu_parallel::multiway_merge_sampling_splitting().

   _SequenceIndex __gnu_parallel::_Settings::min_element_minimal_n
       Minimal input size for min_element.

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

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

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

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

       Referenced by __gnu_parallel::__parallel_nth_element().

   _SequenceIndex __gnu_parallel::_Settings::partial_sort_minimal_n
       Minimal input size for partial_sort.

   float __gnu_parallel::_Settings::partial_sum_dilation
       Ratio for partial_sum. Assume 'sum and write result' to be this factor slower than just
       'sum'.

       Referenced by __gnu_parallel::__parallel_partial_sum_linear().

   unsigned int __gnu_parallel::_Settings::partial_sum_minimal_n
       Minimal input size for partial_sum.

   double __gnu_parallel::_Settings::partition_chunk_share
       Chunk size for partition, relative to input size. If > 0.0, this value overrides
       partition_chunk_size.

       Referenced by __gnu_parallel::__parallel_partition().

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

       Referenced by __gnu_parallel::__parallel_partition().

   _SequenceIndex __gnu_parallel::_Settings::partition_minimal_n
       Minimal input size for partition.

       Referenced by __gnu_parallel::__parallel_nth_element().

   _SequenceIndex __gnu_parallel::_Settings::qsb_steals
       The number of stolen ranges in load-balanced quicksort.

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

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

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

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

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

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

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

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

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

       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).

   _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.

       Referenced by __gnu_parallel::__qsb_local_sort_with_helping().

   unsigned int __gnu_parallel::_Settings::TLB_size
       size of the Translation Lookaside Buffer (underestimation).

       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.

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

Author

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