Kokkos Node API and Local Linear Algebra Kernels Version of the Day
Kokkos_NodeExampleKernels.hpp
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00005 //          Kokkos: Node API and Parallel Node Kernels
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00043 
00044 #ifndef KOKKOS_NODE_EXAMPLE_KERNELS
00045 #define KOKKOS_NODE_EXAMPLE_KERNELS
00046 
00047 #include <Teuchos_RCP.hpp>
00048 #include <Teuchos_ArrayRCP.hpp>
00049 #include <Kokkos_NodeHelpers.hpp>
00050 
00055 #ifndef KERNEL_PREFIX
00056 #define KERNEL_PREFIX
00057 #endif
00058 
00059 namespace KokkosExamples {
00060 
00063   struct VecInit {
00065     int * x;
00067     KERNEL_PREFIX inline void execute(int i) {x[i] = i;}
00068   };
00069 
00072   template <class NODE>
00073   void initVec(Teuchos::RCP<NODE> node, Teuchos::ArrayRCP<int> data) {
00074     Kokkos::ReadyBufferHelper<NODE> rbh(node);
00075     VecInit init;
00076     // ready the buffer and encapsulate the kernel arguments
00077     rbh.begin();
00078     init.x = rbh.addNonConstBuffer(data);
00079     rbh.end();  // this call node->readyBuffers()
00080     // execute the kernel
00081     node->parallel_for(0,data.size(),init);
00082   }
00083 
00086   struct VecReduce {
00088     const int * x;
00090     typedef int ReductionType;
00092     KERNEL_PREFIX static inline int identity()            { return 0;    }
00094     KERNEL_PREFIX        inline int generate(int i)       { return x[i]; }
00096     KERNEL_PREFIX        inline int reduce  (int a, int b){ return a+b;  }
00097   };
00098 
00101   template <class NODE>
00102   int reduceVec(Teuchos::RCP<NODE> node, Teuchos::ArrayRCP<const int> data) {
00103     Kokkos::ReadyBufferHelper<NODE> rbh(node);
00104     VecReduce reduce;
00105     // ready the buffer and encapsulate the kernel arguments
00106     rbh.begin();
00107     reduce.x = rbh.addConstBuffer(data);
00108     rbh.end();  // this call node->readyBuffers()
00109     int ret = node->parallel_reduce(0,data.size(),reduce);
00110     return ret;
00111   }
00112 
00117 } // end of namespace KokkosExamples
00118 
00119 #endif
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