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re PR libstdc++/42712 (search_n/iterator.cc times out in parallel-mode) 

2010-01-19  Johannes Singler  <singler@kit.edu>

        PR libstdc++/42712
        * include/parallel/settings.h (_Settings): Add search_minimal_n.
        * include/parallel/algo.h (__search_switch):
        Add serial fallback for too small inputs.
        (__search_n_switch): Likewise.  Call serial fallback on higher level
        to gain special treatment for __count 0 or 1.
        * testsuite/25_algorithms/search_n/iterator.cc:
        Reenable full test depth for parallel mode.

From-SVN: r156036
This commit is contained in:
Johannes Singler 2010-01-19 11:18:03 +00:00 committed by Johannes Singler
parent f7154d497f
commit 70202e48b6
4 changed files with 29 additions and 13 deletions
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11
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,14 @@
2010-01-19 Johannes Singler <singler@kit.edu>
PR libstdc++/42712
* include/parallel/settings.h (_Settings): Add search_minimal_n.
* include/parallel/algo.h (__search_switch):
Add serial fallback for too small inputs.
(__search_n_switch): Likewise. Call serial fallback on higher level
to gain special treatment for __count 0 or 1.
* testsuite/25_algorithms/search_n/iterator.cc:
Reenable full test depth for parallel mode.
2010-01-18 Daniel Frey <d.frey@gmx.de>
* include/std/functional (_Bind<_Functor(_Bound_args...)>::

20
libstdc++-v3/include/parallel/algo.h
View File

@ -1043,7 +1043,9 @@ namespace __parallel
typedef std::iterator_traits<_RAIter2> _Iterator2Traits;
typedef typename _Iterator2Traits::value_type _ValueType2;
if (_GLIBCXX_PARALLEL_CONDITION(true))
if (_GLIBCXX_PARALLEL_CONDITION(
static_cast<__gnu_parallel::_SequenceIndex>(__end1 - __begin1)
>= __gnu_parallel::_Settings::get().search_minimal_n))
return __gnu_parallel::
__search_template(
__begin1, __end1, __begin2, __end2,
@ -1097,7 +1099,9 @@ namespace __parallel
_BinaryPredicate __pred,
random_access_iterator_tag, random_access_iterator_tag)
{
if (_GLIBCXX_PARALLEL_CONDITION(true))
if (_GLIBCXX_PARALLEL_CONDITION(
static_cast<__gnu_parallel::_SequenceIndex>(__end1 - __begin1)
>= __gnu_parallel::_Settings::get().search_minimal_n))
return __gnu_parallel::__search_template(__begin1, __end1,
__begin2, __end2, __pred);
else
@ -1168,15 +1172,17 @@ namespace __parallel
const _Tp& __val, _BinaryPredicate __binary_pred,
random_access_iterator_tag)
{
if (_GLIBCXX_PARALLEL_CONDITION(true))
if (_GLIBCXX_PARALLEL_CONDITION(
static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin)
>= __gnu_parallel::_Settings::get().search_minimal_n))
{
__gnu_parallel::_PseudoSequence<_Tp, _Integer> __ps(__val, __count);
return __gnu_parallel::__search_template(
__begin, __end, __ps.begin(), __ps.end(), __binary_pred);
}
else
return std::__search_n(__begin, __end, __count, __val,
__binary_pred, random_access_iterator_tag());
return _GLIBCXX_STD_P::search_n(__begin, __end, __count, __val,
__binary_pred);
}
// Sequential fallback for input iterator case.
@ -1186,8 +1192,8 @@ namespace __parallel
__search_n_switch(_FIterator __begin, _FIterator __end, _Integer __count,
const _Tp& __val, _BinaryPredicate __binary_pred,
_IteratorTag)
{ return __search_n(__begin, __end, __count, __val, __binary_pred,
_IteratorTag()); }
{ return _GLIBCXX_STD_P::search_n(__begin, __end, __count, __val,
__binary_pred); }
// Public interface.
template<typename _FIterator, typename _Integer, typename _Tp,

6
libstdc++-v3/include/parallel/settings.h
View File

@ -269,6 +269,9 @@ namespace __gnu_parallel
/// The number of stolen ranges in load-balanced quicksort.
_SequenceIndex qsb_steals;
/// Minimal input size for search and search_n.
_SequenceIndex search_minimal_n;
/// Get the global settings.
_GLIBCXX_CONST static const _Settings&
get() throw();
@ -327,7 +330,8 @@ namespace __gnu_parallel
L2_cache_size(256 << 10),
TLB_size(128),
cache_line_size(64),
qsb_steals(0)
qsb_steals(0),
search_minimal_n(1000)
{ }
};
}

5
libstdc++-v3/testsuite/25_algorithms/search_n/iterator.cc
View File

@ -25,11 +25,6 @@
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
// XXX FIXME: why parallel-mode is so slow?
#if !defined(TEST_DEPTH) && defined(_GLIBCXX_PARALLEL)
#define TEST_DEPTH 10
#endif
#ifndef TEST_DEPTH
#define TEST_DEPTH 14
#endif