Kokkos Node API and Local Linear Algebra Kernels Version of the Day
Kokkos_OpenMPNode.hpp
00001 //@HEADER
00002 // ************************************************************************
00003 //
00004 //          Kokkos: Node API and Parallel Node Kernels
00005 //              Copyright (2008) Sandia Corporation
00006 //
00007 // Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
00008 // the U.S. Government retains certain rights in this software.
00009 //
00010 // Redistribution and use in source and binary forms, with or without
00011 // modification, are permitted provided that the following conditions are
00012 // met:
00013 //
00014 // 1. Redistributions of source code must retain the above copyright
00015 // notice, this list of conditions and the following disclaimer.
00016 //
00017 // 2. Redistributions in binary form must reproduce the above copyright
00018 // notice, this list of conditions and the following disclaimer in the
00019 // documentation and/or other materials provided with the distribution.
00020 //
00021 // 3. Neither the name of the Corporation nor the names of the
00022 // contributors may be used to endorse or promote products derived from
00023 // this software without specific prior written permission.
00024 //
00025 // THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
00026 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00027 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00028 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
00029 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00030 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00031 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00032 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00033 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00034 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00035 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00036 //
00037 // Questions? Contact Michael A. Heroux (maherou@sandia.gov)
00038 //
00039 // ************************************************************************
00040 //@HEADER
00041 
00042 
00043 #ifndef KOKKOS_OPENMPNODE_HPP_
00044 #define KOKKOS_OPENMPNODE_HPP_
00045 
00046 #include "Kokkos_StandardNodeMemoryModel.hpp"
00047 #include "Kokkos_NodeHelpers.hpp"
00048 
00049 #include <omp.h>
00050 
00051 namespace Teuchos {
00052   //forward declarations
00053   class ParameterList;
00054 }
00055 
00056 namespace Kokkos {
00057 
00060   class OpenMPNode : public StandardNodeMemoryModel {
00061   public:
00062 
00076     OpenMPNode(Teuchos::ParameterList &pl);
00077 
00083     OpenMPNode();
00084 
00086     ~OpenMPNode();
00087 
00099     void init(int numThreads);
00100 
00102     template <class WDP>
00103     static void parallel_for(int beg, int end, WDP wd) {
00104 #pragma omp parallel for schedule(guided) default(shared)
00105       for (int i = beg; i < end; ++i) {
00106         wd.execute(i);
00107       }
00108     }
00109 
00111     template <class WDP>
00112     static typename WDP::ReductionType
00113     parallel_reduce(int beg, int end, WDP wd) {
00114       typedef typename WDP::ReductionType ReductionType;
00115       ReductionType threadResult = WDP::identity();
00116       ReductionType globalResult = WDP::identity();
00117 #pragma omp parallel default(shared) firstprivate(threadResult)
00118       {
00119 #pragma omp for
00120         for (int i = beg; i < end; ++i) {
00121           threadResult = wd.reduce(threadResult, wd.generate(i));
00122         }
00123 #pragma omp critical
00124         globalResult = wd.reduce(globalResult, threadResult);
00125       }
00126       return globalResult;
00127     }
00128 
00130     inline void sync() const {};
00131 
00132   private:
00137     int curNumThreads_;
00138 
00140     bool verbose_;
00141   };
00142 
00143   template <> class ArrayOfViewsHelper<OpenMPNode> : public ArrayOfViewsHelperTrivialImpl<OpenMPNode> {};
00144 
00145 }
00146 
00147 #endif
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends