__gnu_parallel::_Settings(3)

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 sumandwriteresult"tobethisfactorslowerthanjustsum.
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::__find_template(), __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(), __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 & ) [static]

Set the global settings.

References accumulate_minimal_n, adjacent_difference_minimal_n, cache_line_size, count_minimal_n, fill_minimal_n, find_increasing_factor, find_initial_block_size, find_maximum_block_size, find_scale_factor, find_sequential_search_size, for_each_minimal_n, generate_minimal_n, L1_cache_size, L2_cache_size, max_element_minimal_n, merge_minimal_n, merge_oversampling, min_element_minimal_n, multiway_merge_minimal_k, multiway_merge_minimal_n, multiway_merge_oversampling, nth_element_minimal_n, partial_sort_minimal_n, partial_sum_dilation, partial_sum_minimal_n, partition_chunk_share, partition_chunk_size, partition_minimal_n, qsb_steals, random_shuffle_minimal_n, replace_minimal_n, search_minimal_n, set(), set_difference_minimal_n, set_intersection_minimal_n, set_symmetric_difference_minimal_n, set_union_minimal_n, sort_minimal_n, sort_mwms_oversampling, sort_qs_num_samples_preset, sort_qsb_base_case_maximal_n, TLB_size, transform_minimal_n, and unique_copy_minimal_n.

Referenced by set().

Member Data Documentation

  _SequenceIndex __gnu_parallel::_Settings::accumulate_minimal_n

Minimal input size for accumulate.

Referenced by set().

  unsigned int __gnu_parallel::_Settings::adjacent_difference_minimal_n

Minimal input size for adjacent_difference.

Referenced by set().

  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(), and set().

  _SequenceIndex __gnu_parallel::_Settings::count_minimal_n

Minimal input size for count and count_if.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::fill_minimal_n

Minimal input size for fill.

Referenced by set().

  double __gnu_parallel::_Settings::find_increasing_factor

Block size increase factor for find.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::find_initial_block_size

Initial block size for find.

Referenced by __gnu_parallel::__find_template(), and set().

  _SequenceIndex __gnu_parallel::_Settings::find_maximum_block_size

Maximal block size for find.

Referenced by set().

  float __gnu_parallel::_Settings::find_scale_factor

Block size scale-down factor with respect to current position.

Referenced by __gnu_parallel::__find_template(), and set().

  _SequenceIndex __gnu_parallel::_Settings::find_sequential_search_size

Start with looking for this many elements sequentially, for find.

Referenced by __gnu_parallel::__find_template(), __gnu_parallel::__find_template(), and set().

  _SequenceIndex __gnu_parallel::_Settings::for_each_minimal_n

Minimal input size for for_each.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::generate_minimal_n

Minimal input size for generate.

Referenced by set().

  unsigned long long __gnu_parallel::_Settings::L1_cache_size

size of the L1 cache in bytes (underestimation).

Referenced by set().

  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(), __gnu_parallel::__sequential_random_shuffle(), and set().

  _SequenceIndex __gnu_parallel::_Settings::max_element_minimal_n

Minimal input size for max_element.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::merge_minimal_n

Minimal input size for merge.

Referenced by set().

  unsigned int __gnu_parallel::_Settings::merge_oversampling

Oversampling factor for merge.

Referenced by __gnu_parallel::multiway_merge_sampling_splitting(), __gnu_parallel::parallel_multiway_merge(), and set().

  _SequenceIndex __gnu_parallel::_Settings::min_element_minimal_n

Minimal input size for min_element.

Referenced by set().

  int __gnu_parallel::_Settings::multiway_merge_minimal_k

Oversampling factor for multiway_merge.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::multiway_merge_minimal_n

Minimal input size for multiway_merge.

Referenced by set().

  unsigned int __gnu_parallel::_Settings::multiway_merge_oversampling

Oversampling factor for multiway_merge.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::nth_element_minimal_n

Minimal input size for nth_element.

Referenced by __gnu_parallel::__parallel_nth_element(), and set().

  _SequenceIndex __gnu_parallel::_Settings::partial_sort_minimal_n

Minimal input size for partial_sort.

Referenced by set().

  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(), and set().

  unsigned int __gnu_parallel::_Settings::partial_sum_minimal_n

Minimal input size for partial_sum.

Referenced by set().

  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(), and set().

  _SequenceIndex __gnu_parallel::_Settings::partition_chunk_size

Chunk size for partition.

Referenced by __gnu_parallel::__parallel_partition(), and set().

  _SequenceIndex __gnu_parallel::_Settings::partition_minimal_n

Minimal input size for partition.

Referenced by __gnu_parallel::__parallel_nth_element(), and set().

  _SequenceIndex __gnu_parallel::_Settings::qsb_steals

The number of stolen ranges in load-balanced quicksort.

Referenced by set().

  unsigned int __gnu_parallel::_Settings::random_shuffle_minimal_n

Minimal input size for random_shuffle.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::replace_minimal_n

Minimal input size for replace and replace_if.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::search_minimal_n

Minimal input size for search and search_n.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::set_difference_minimal_n

Minimal input size for set_difference.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::set_intersection_minimal_n

Minimal input size for set_intersection.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::set_symmetric_difference_minimal_n

Minimal input size for set_symmetric_difference.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::set_union_minimal_n

Minimal input size for set_union.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::sort_minimal_n

Minimal input size for parallel sorting.

Referenced by set().

  unsigned int __gnu_parallel::_Settings::sort_mwms_oversampling

Oversampling factor for parallel std::sort (MWMS).

Referenced by __gnu_parallel::parallel_sort_mwms(), __gnu_parallel::parallel_sort_mwms_pu(), and set().

  unsigned int __gnu_parallel::_Settings::sort_qs_num_samples_preset

Such many samples to take to find a good pivot (quicksort).

Referenced by set().

  _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(), and set().

  unsigned int __gnu_parallel::_Settings::TLB_size

size of the Translation Lookaside Buffer (underestimation).

Referenced by __gnu_parallel::__parallel_random_shuffle_drs(), __gnu_parallel::__sequential_random_shuffle(), and set().

  _SequenceIndex __gnu_parallel::_Settings::transform_minimal_n

Minimal input size for parallel std::transform.

Referenced by set().

  _SequenceIndex __gnu_parallel::_Settings::unique_copy_minimal_n

Minimal input size for unique_copy.

Referenced by set().

Author

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