# __gnu_parallel::_Settings Struct Reference

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

List of all members.

## Static Public Member Functions

- static _GLIBCXX_CONST 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
- _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 _GLIBCXX_CONST 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_sort(), __gnu_parallel::__parallel_sort_qs_conquer(), __gnu_parallel::__qsb_local_sort_with_helping(), __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.

Referenced by __gnu_parallel::__find_template().

_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.

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.

The documentation for this struct was generated from the following file:

- settings.h