.TH "__gnu_parallel::_Settings" 3cxx "libstdc++" \" -*- nroff -*-
.ad l
.nh
.SH NAME
__gnu_parallel::_Settings \- class _Settings Run-time settings for the parallel mode including all tunable parameters\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <settings\&.h>\fP
.SS "Static Public Member Functions"

.in +1c
.ti -1c
.RI "static const \fB_Settings\fP & \fBget\fP ()  throw ()"
.br
.RI "Get the global settings\&. "
.ti -1c
.RI "static void \fBset\fP (\fB_Settings\fP &)  throw ()"
.br
.RI "Set the global settings\&. "
.in -1c
.SS "Public Attributes"

.in +1c
.ti -1c
.RI "\fB_SequenceIndex\fP \fBaccumulate_minimal_n\fP"
.br
.RI "Minimal input size for accumulate\&. "
.ti -1c
.RI "unsigned int \fBadjacent_difference_minimal_n\fP"
.br
.RI "Minimal input size for adjacent_difference\&. "
.ti -1c
.RI "\fB_AlgorithmStrategy\fP \fBalgorithm_strategy\fP"
.br
.ti -1c
.RI "unsigned int \fBcache_line_size\fP"
.br
.RI "Overestimation of cache line size\&. Used to avoid false sharing, i\&.e\&. elements of different threads are at least this amount apart\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBcount_minimal_n\fP"
.br
.RI "Minimal input size for count and count_if\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBfill_minimal_n\fP"
.br
.RI "Minimal input size for fill\&. "
.ti -1c
.RI "\fB_FindAlgorithm\fP \fBfind_algorithm\fP"
.br
.ti -1c
.RI "double \fBfind_increasing_factor\fP"
.br
.RI "Block size increase factor for find\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBfind_initial_block_size\fP"
.br
.RI "Initial block size for find\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBfind_maximum_block_size\fP"
.br
.RI "Maximal block size for find\&. "
.ti -1c
.RI "float \fBfind_scale_factor\fP"
.br
.RI "Block size scale-down factor with respect to current position\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBfind_sequential_search_size\fP"
.br
.RI "Start with looking for this many elements sequentially, for find\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBfor_each_minimal_n\fP"
.br
.RI "Minimal input size for for_each\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBgenerate_minimal_n\fP"
.br
.RI "Minimal input size for generate\&. "
.ti -1c
.RI "unsigned long long \fBL1_cache_size\fP"
.br
.RI "size of the L1 cache in bytes (underestimation)\&. "
.ti -1c
.RI "unsigned long long \fBL2_cache_size\fP"
.br
.RI "size of the L2 cache in bytes (underestimation)\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBmax_element_minimal_n\fP"
.br
.RI "Minimal input size for max_element\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBmerge_minimal_n\fP"
.br
.RI "Minimal input size for merge\&. "
.ti -1c
.RI "unsigned int \fBmerge_oversampling\fP"
.br
.RI "Oversampling factor for merge\&. "
.ti -1c
.RI "\fB_SplittingAlgorithm\fP \fBmerge_splitting\fP"
.br
.ti -1c
.RI "\fB_SequenceIndex\fP \fBmin_element_minimal_n\fP"
.br
.RI "Minimal input size for min_element\&. "
.ti -1c
.RI "\fB_MultiwayMergeAlgorithm\fP \fBmultiway_merge_algorithm\fP"
.br
.ti -1c
.RI "int \fBmultiway_merge_minimal_k\fP"
.br
.RI "Oversampling factor for multiway_merge\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBmultiway_merge_minimal_n\fP"
.br
.RI "Minimal input size for multiway_merge\&. "
.ti -1c
.RI "unsigned int \fBmultiway_merge_oversampling\fP"
.br
.RI "Oversampling factor for multiway_merge\&. "
.ti -1c
.RI "\fB_SplittingAlgorithm\fP \fBmultiway_merge_splitting\fP"
.br
.ti -1c
.RI "\fB_SequenceIndex\fP \fBnth_element_minimal_n\fP"
.br
.RI "Minimal input size for nth_element\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBpartial_sort_minimal_n\fP"
.br
.RI "Minimal input size for partial_sort\&. "
.ti -1c
.RI "\fB_PartialSumAlgorithm\fP \fBpartial_sum_algorithm\fP"
.br
.ti -1c
.RI "float \fBpartial_sum_dilation\fP"
.br
.RI "Ratio for partial_sum\&. Assume 'sum and write result' to be this factor slower than just 'sum'\&. "
.ti -1c
.RI "unsigned int \fBpartial_sum_minimal_n\fP"
.br
.RI "Minimal input size for partial_sum\&. "
.ti -1c
.RI "double \fBpartition_chunk_share\fP"
.br
.RI "Chunk size for partition, relative to input size\&. If > 0\&.0, this value overrides partition_chunk_size\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBpartition_chunk_size\fP"
.br
.RI "Chunk size for partition\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBpartition_minimal_n\fP"
.br
.RI "Minimal input size for partition\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBqsb_steals\fP"
.br
.RI "The number of stolen ranges in load-balanced quicksort\&. "
.ti -1c
.RI "unsigned int \fBrandom_shuffle_minimal_n\fP"
.br
.RI "Minimal input size for random_shuffle\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBreplace_minimal_n\fP"
.br
.RI "Minimal input size for replace and replace_if\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBsearch_minimal_n\fP"
.br
.RI "Minimal input size for search and search_n\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBset_difference_minimal_n\fP"
.br
.RI "Minimal input size for set_difference\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBset_intersection_minimal_n\fP"
.br
.RI "Minimal input size for set_intersection\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBset_symmetric_difference_minimal_n\fP"
.br
.RI "Minimal input size for set_symmetric_difference\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBset_union_minimal_n\fP"
.br
.RI "Minimal input size for set_union\&. "
.ti -1c
.RI "\fB_SortAlgorithm\fP \fBsort_algorithm\fP"
.br
.ti -1c
.RI "\fB_SequenceIndex\fP \fBsort_minimal_n\fP"
.br
.RI "Minimal input size for parallel sorting\&. "
.ti -1c
.RI "unsigned int \fBsort_mwms_oversampling\fP"
.br
.RI "Oversampling factor for parallel std::sort (MWMS)\&. "
.ti -1c
.RI "unsigned int \fBsort_qs_num_samples_preset\fP"
.br
.RI "Such many samples to take to find a good pivot (quicksort)\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBsort_qsb_base_case_maximal_n\fP"
.br
.RI "Maximal subsequence __length to switch to unbalanced __base case\&. Applies to std::sort with dynamically load-balanced quicksort\&. "
.ti -1c
.RI "\fB_SplittingAlgorithm\fP \fBsort_splitting\fP"
.br
.ti -1c
.RI "unsigned int \fBTLB_size\fP"
.br
.RI "size of the Translation Lookaside Buffer (underestimation)\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBtransform_minimal_n\fP"
.br
.RI "Minimal input size for parallel std::transform\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBunique_copy_minimal_n\fP"
.br
.RI "Minimal input size for unique_copy\&. "
.ti -1c
.RI "\fB_SequenceIndex\fP \fBworkstealing_chunk_size\fP"
.br
.in -1c
.SH "Detailed Description"
.PP 
class _Settings Run-time settings for the parallel mode including all tunable parameters\&. 
.PP
Definition at line \fB123\fP of file \fBsettings\&.h\fP\&.
.SH "Constructor & Destructor Documentation"
.PP 
.SS "__gnu_parallel::_Settings::_Settings ()\fC [inline]\fP, \fC [explicit]\fP"

.PP
Definition at line \fB287\fP of file \fBsettings\&.h\fP\&.
.SH "Member Function Documentation"
.PP 
.SS "static const \fB_Settings\fP & __gnu_parallel::_Settings::get ()\fC [static]\fP"

.PP
Get the global settings\&. 
.PP
Referenced by \fB__gnu_parallel::__find_template()\fP, \fB__gnu_parallel::__find_template()\fP, \fB__gnu_parallel::__find_template()\fP, \fB__gnu_parallel::__for_each_template_random_access_workstealing()\fP, \fB__gnu_parallel::__parallel_nth_element()\fP, \fB__gnu_parallel::__parallel_partial_sum()\fP, \fB__gnu_parallel::__parallel_partial_sum_linear()\fP, \fB__gnu_parallel::__parallel_partition()\fP, \fB__gnu_parallel::__parallel_random_shuffle_drs()\fP, \fB__gnu_parallel::__parallel_sort()\fP, \fB__gnu_parallel::__parallel_sort()\fP, \fB__gnu_parallel::__parallel_sort_qs_conquer()\fP, \fB__gnu_parallel::__qsb_local_sort_with_helping()\fP, \fB__gnu_parallel::__sequential_random_shuffle()\fP, \fB__gnu_parallel::multiway_merge_sampling_splitting()\fP, \fB__gnu_parallel::parallel_multiway_merge()\fP, \fB__gnu_parallel::parallel_sort_mwms()\fP, and \fB__gnu_parallel::parallel_sort_mwms_pu()\fP\&.
.SS "static void __gnu_parallel::_Settings::set (\fB_Settings\fP &)\fC [static]\fP"

.PP
Set the global settings\&. 
.SH "Member Data Documentation"
.PP 
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::accumulate_minimal_n"

.PP
Minimal input size for accumulate\&. 
.PP
Definition at line \fB139\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::adjacent_difference_minimal_n"

.PP
Minimal input size for adjacent_difference\&. 
.PP
Definition at line \fB142\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_AlgorithmStrategy\fP __gnu_parallel::_Settings::algorithm_strategy"

.PP
Definition at line \fB125\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::cache_line_size"

.PP
Overestimation of cache line size\&. Used to avoid false sharing, i\&.e\&. elements of different threads are at least this amount apart\&. 
.PP
Definition at line \fB265\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__for_each_template_random_access_workstealing()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::count_minimal_n"

.PP
Minimal input size for count and count_if\&. 
.PP
Definition at line \fB145\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::fill_minimal_n"

.PP
Minimal input size for fill\&. 
.PP
Definition at line \fB148\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_FindAlgorithm\fP __gnu_parallel::_Settings::find_algorithm"

.PP
Definition at line \fB130\fP of file \fBsettings\&.h\fP\&.
.SS "double __gnu_parallel::_Settings::find_increasing_factor"

.PP
Block size increase factor for find\&. 
.PP
Definition at line \fB151\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::find_initial_block_size"

.PP
Initial block size for find\&. 
.PP
Definition at line \fB154\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__find_template()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::find_maximum_block_size"

.PP
Maximal block size for find\&. 
.PP
Definition at line \fB157\fP of file \fBsettings\&.h\fP\&.
.SS "float __gnu_parallel::_Settings::find_scale_factor"

.PP
Block size scale-down factor with respect to current position\&. 
.PP
Definition at line \fB276\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__find_template()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::find_sequential_search_size"

.PP
Start with looking for this many elements sequentially, for find\&. 
.PP
Definition at line \fB160\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__find_template()\fP, and \fB__gnu_parallel::__find_template()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::for_each_minimal_n"

.PP
Minimal input size for for_each\&. 
.PP
Definition at line \fB163\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::generate_minimal_n"

.PP
Minimal input size for generate\&. 
.PP
Definition at line \fB166\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned long long __gnu_parallel::_Settings::L1_cache_size"

.PP
size of the L1 cache in bytes (underestimation)\&. 
.PP
Definition at line \fB254\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned long long __gnu_parallel::_Settings::L2_cache_size"

.PP
size of the L2 cache in bytes (underestimation)\&. 
.PP
Definition at line \fB257\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_random_shuffle_drs()\fP, and \fB__gnu_parallel::__sequential_random_shuffle()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::max_element_minimal_n"

.PP
Minimal input size for max_element\&. 
.PP
Definition at line \fB169\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::merge_minimal_n"

.PP
Minimal input size for merge\&. 
.PP
Definition at line \fB172\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::merge_oversampling"

.PP
Oversampling factor for merge\&. 
.PP
Definition at line \fB175\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::multiway_merge_sampling_splitting()\fP, and \fB__gnu_parallel::parallel_multiway_merge()\fP\&.
.SS "\fB_SplittingAlgorithm\fP __gnu_parallel::_Settings::merge_splitting"

.PP
Definition at line \fB133\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::min_element_minimal_n"

.PP
Minimal input size for min_element\&. 
.PP
Definition at line \fB178\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_MultiwayMergeAlgorithm\fP __gnu_parallel::_Settings::multiway_merge_algorithm"

.PP
Definition at line \fB129\fP of file \fBsettings\&.h\fP\&.
.SS "int __gnu_parallel::_Settings::multiway_merge_minimal_k"

.PP
Oversampling factor for multiway_merge\&. 
.PP
Definition at line \fB184\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::multiway_merge_minimal_n"

.PP
Minimal input size for multiway_merge\&. 
.PP
Definition at line \fB181\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::multiway_merge_oversampling"

.PP
Oversampling factor for multiway_merge\&. 
.PP
Definition at line \fB187\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SplittingAlgorithm\fP __gnu_parallel::_Settings::multiway_merge_splitting"

.PP
Definition at line \fB134\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::nth_element_minimal_n"

.PP
Minimal input size for nth_element\&. 
.PP
Definition at line \fB190\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_nth_element()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::partial_sort_minimal_n"

.PP
Minimal input size for partial_sort\&. 
.PP
Definition at line \fB203\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_PartialSumAlgorithm\fP __gnu_parallel::_Settings::partial_sum_algorithm"

.PP
Definition at line \fB128\fP of file \fBsettings\&.h\fP\&.
.SS "float __gnu_parallel::_Settings::partial_sum_dilation"

.PP
Ratio for partial_sum\&. Assume 'sum and write result' to be this factor slower than just 'sum'\&. 
.PP
Definition at line \fB207\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_partial_sum_linear()\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::partial_sum_minimal_n"

.PP
Minimal input size for partial_sum\&. 
.PP
Definition at line \fB210\fP of file \fBsettings\&.h\fP\&.
.SS "double __gnu_parallel::_Settings::partition_chunk_share"

.PP
Chunk size for partition, relative to input size\&. If > 0\&.0, this value overrides partition_chunk_size\&. 
.PP
Definition at line \fB197\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_partition()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::partition_chunk_size"

.PP
Chunk size for partition\&. 
.PP
Definition at line \fB193\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_partition()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::partition_minimal_n"

.PP
Minimal input size for partition\&. 
.PP
Definition at line \fB200\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_nth_element()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::qsb_steals"

.PP
The number of stolen ranges in load-balanced quicksort\&. 
.PP
Definition at line \fB270\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::random_shuffle_minimal_n"

.PP
Minimal input size for random_shuffle\&. 
.PP
Definition at line \fB213\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::replace_minimal_n"

.PP
Minimal input size for replace and replace_if\&. 
.PP
Definition at line \fB216\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::search_minimal_n"

.PP
Minimal input size for search and search_n\&. 
.PP
Definition at line \fB273\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::set_difference_minimal_n"

.PP
Minimal input size for set_difference\&. 
.PP
Definition at line \fB219\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::set_intersection_minimal_n"

.PP
Minimal input size for set_intersection\&. 
.PP
Definition at line \fB222\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::set_symmetric_difference_minimal_n"

.PP
Minimal input size for set_symmetric_difference\&. 
.PP
Definition at line \fB225\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::set_union_minimal_n"

.PP
Minimal input size for set_union\&. 
.PP
Definition at line \fB228\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SortAlgorithm\fP __gnu_parallel::_Settings::sort_algorithm"

.PP
Definition at line \fB127\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::sort_minimal_n"

.PP
Minimal input size for parallel sorting\&. 
.PP
Definition at line \fB231\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::sort_mwms_oversampling"

.PP
Oversampling factor for parallel std::sort (MWMS)\&. 
.PP
Definition at line \fB234\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::parallel_sort_mwms()\fP, and \fB__gnu_parallel::parallel_sort_mwms_pu()\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::sort_qs_num_samples_preset"

.PP
Such many samples to take to find a good pivot (quicksort)\&. 
.PP
Definition at line \fB237\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::sort_qsb_base_case_maximal_n"

.PP
Maximal subsequence __length to switch to unbalanced __base case\&. Applies to std::sort with dynamically load-balanced quicksort\&. 
.PP
Definition at line \fB241\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__qsb_local_sort_with_helping()\fP\&.
.SS "\fB_SplittingAlgorithm\fP __gnu_parallel::_Settings::sort_splitting"

.PP
Definition at line \fB132\fP of file \fBsettings\&.h\fP\&.
.SS "unsigned int __gnu_parallel::_Settings::TLB_size"

.PP
size of the Translation Lookaside Buffer (underestimation)\&. 
.PP
Definition at line \fB260\fP of file \fBsettings\&.h\fP\&.
.PP
Referenced by \fB__gnu_parallel::__parallel_random_shuffle_drs()\fP, and \fB__gnu_parallel::__sequential_random_shuffle()\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::transform_minimal_n"

.PP
Minimal input size for parallel std::transform\&. 
.PP
Definition at line \fB244\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::unique_copy_minimal_n"

.PP
Minimal input size for unique_copy\&. 
.PP
Definition at line \fB247\fP of file \fBsettings\&.h\fP\&.
.SS "\fB_SequenceIndex\fP __gnu_parallel::_Settings::workstealing_chunk_size"

.PP
Definition at line \fB249\fP of file \fBsettings\&.h\fP\&.

.SH "Author"
.PP 
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