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Edit File : omp_loop_static.h \| Size : 4.01 KB
// -- C++ -- // Copyright (C) 2007-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the terms // of the GNU General Public License as published by the Free Software // Foundation; either version 3, or (at your option) any later // version. // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file parallel/omp_loop_static.h * @brief Parallelization of embarrassingly parallel execution by * means of an OpenMP for loop with static scheduling. * This file is a GNU parallel extension to the Standard C++ Library. / // Written by Felix Putze. #ifndef _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H #define _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H 1 #include <omp.h> #include <parallel/settings.h> #include <parallel/basic_iterator.h> namespace __gnu_parallel { /* @brief Embarrassingly parallel algorithm for random access * iterators, using an OpenMP for loop with static scheduling. * * @param __begin Begin iterator of element sequence. * @param __end End iterator of element sequence. * @param __o User-supplied functor (comparator, predicate, adding * functor, ...). * @param __f Functor to @a process an element with __op (depends on * desired functionality, e. g. for std::for_each(), ...). * @param __r Functor to @a add a single __result to the already processed * __elements (depends on functionality). * @param __base Base value for reduction. * @param __output Pointer to position where final result is written to * @param __bound Maximum number of elements processed (e. g. for * std::count_n()). * @return User-supplied functor (that may contain a part of the result). / template<typename _RAIter, typename _Op, typename _Fu, typename _Red, typename _Result> _Op __for_each_template_random_access_omp_loop_static(_RAIter __begin, _RAIter __end, _Op __o, _Fu& __f, _Red __r, _Result __base, _Result& __output, typename std::iterator_traits<_RAIter>::difference_type __bound) { typedef typename std::iterator_traits<_RAIter>::difference_type _DifferenceType; _DifferenceType __length = __end - __begin; _ThreadIndex __num_threads = std::min<_DifferenceType> (__get_max_threads(), __length); _Result __thread_results; # pragma omp parallel num_threads(__num_threads) { # pragma omp single { __num_threads = omp_get_num_threads(); __thread_results = new _Result[__num_threads]; for (_ThreadIndex __i = 0; __i < __num_threads; ++__i) __thread_results[__i] = _Result(); } _ThreadIndex __iam = omp_get_thread_num(); #pragma omp for schedule(static, _Settings::get().workstealing_chunk_size) for (_DifferenceType __pos = 0; __pos < __length; ++__pos) __thread_results[__iam] = __r(__thread_results[__iam], __f(__o, __begin+__pos)); } //parallel for (_ThreadIndex __i = 0; __i < __num_threads; ++__i) __output = __r(__output, __thread_results[__i]); delete [] __thread_results; // Points to last element processed (needed as return value for // some algorithms like transform). __f.finish_iterator = __begin + __length; return __o; } } // end namespace #endif /* _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H */ Back

Edit File : omp_loop_static.h | Size : 4.01 KB

// -*- C++ -*-

// Copyright (C) 2007-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.

// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file parallel/omp_loop_static.h
 *  @brief Parallelization of embarrassingly parallel execution by
 *  means of an OpenMP for loop with static scheduling.
 *  This file is a GNU parallel extension to the Standard C++ Library.
 */

// Written by Felix Putze.

#ifndef _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H
#define _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H 1

#include <omp.h>

#include <parallel/settings.h>
#include <parallel/basic_iterator.h>

namespace __gnu_parallel
{
  /** @brief Embarrassingly parallel algorithm for random access
   * iterators, using an OpenMP for loop with static scheduling.
   *
   *  @param __begin Begin iterator of element sequence.
   *  @param __end End iterator of element sequence.
   *  @param __o User-supplied functor (comparator, predicate, adding
   *  functor, ...).
   *  @param __f Functor to @a process an element with __op (depends on
   *  desired functionality, e. g. for std::for_each(), ...).
   *  @param __r Functor to @a add a single __result to the already processed
   *  __elements (depends on functionality).
   *  @param __base Base value for reduction.
   *  @param __output Pointer to position where final result is written to
   *  @param __bound Maximum number of elements processed (e. g. for
   *  std::count_n()).
   *  @return User-supplied functor (that may contain a part of the result).
   */
  template<typename _RAIter,
	   typename _Op,
	   typename _Fu,
	   typename _Red,
	   typename _Result>
    _Op
    __for_each_template_random_access_omp_loop_static(_RAIter __begin,
						      _RAIter __end, _Op __o,
						      _Fu& __f, _Red __r,
						      _Result __base,
						      _Result& __output,
      typename std::iterator_traits<_RAIter>::difference_type __bound)
    {
      typedef typename std::iterator_traits<_RAIter>::difference_type
	_DifferenceType;

_DifferenceType __length = __end - __begin;
      _ThreadIndex __num_threads = std::min<_DifferenceType>
	(__get_max_threads(), __length);

_Result *__thread_results;

#     pragma omp parallel num_threads(__num_threads)
      {
#       pragma omp single
	{
	  __num_threads = omp_get_num_threads();
	  __thread_results = new _Result[__num_threads];

for (_ThreadIndex __i = 0; __i < __num_threads; ++__i)
	    __thread_results[__i] = _Result();
	}

_ThreadIndex __iam = omp_get_thread_num();

#pragma omp for schedule(static, _Settings::get().workstealing_chunk_size)
        for (_DifferenceType __pos = 0; __pos < __length; ++__pos)
          __thread_results[__iam] = __r(__thread_results[__iam],
                                        __f(__o, __begin+__pos));
      } //parallel

for (_ThreadIndex __i = 0; __i < __num_threads; ++__i)
	__output = __r(__output, __thread_results[__i]);

delete [] __thread_results;

// Points to last element processed (needed as return value for
      // some algorithms like transform).
      __f.finish_iterator = __begin + __length;

return __o;
    }

} // end namespace

#endif /* _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H */

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