0855805ce2
This commits adds an implementation using the C++ parallel STL. The Makefile uses the NVIDIA HPC SDK `nvc++` compiler with the `-stdpar` flag. Tested using the NVIDIA HPC SDK 20.9.
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
// Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved.
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//
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// For full license terms please see the LICENSE file distributed with this
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// source code
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#include "STDStream.h"
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#include <algorithm>
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#include <execution>
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#include <numeric>
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// There are three execution policies:
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// auto exe_policy = std::execution::seq;
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// auto exe_policy = std::execution::par;
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auto exe_policy = std::execution::par_unseq;
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template <class T>
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STDStream<T>::STDStream(const unsigned int ARRAY_SIZE, T *a, T *b, T *c, int device)
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noexcept : array_size{ARRAY_SIZE}, a{a}, b{b}, c{c}
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{
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}
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template <class T>
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void STDStream<T>::init_arrays(T initA, T initB, T initC)
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{
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std::fill(exe_policy, a, a+array_size, initA);
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std::fill(exe_policy, b, b+array_size, initB);
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std::fill(exe_policy, c, c+array_size, initC);
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}
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template <class T>
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void STDStream<T>::read_arrays(std::vector<T>& h_a, std::vector<T>& h_b, std::vector<T>& h_c)
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{
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std::copy(exe_policy, a, a+array_size, h_a.data());
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std::copy(exe_policy, b, b+array_size, h_b.data());
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std::copy(exe_policy, c, c+array_size, h_c.data());
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}
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template <class T>
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void STDStream<T>::copy()
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{
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// c[i] = a[i]
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std::copy(exe_policy, a, a+array_size, c) ;
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}
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template <class T>
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void STDStream<T>::mul()
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{
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// b[i] = scalar * c[i];
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std::transform(exe_policy, c, c+array_size, b, [](T ci){ return startScalar*ci; });
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}
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template <class T>
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void STDStream<T>::add()
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{
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// c[i] = a[i] + b[i];
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std::transform(exe_policy, a, a+array_size, b, c, std::plus<T>());
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}
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template <class T>
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void STDStream<T>::triad()
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{
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// a[i] = b[i] + scalar * c[i];
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std::transform(exe_policy, b, b+array_size, c, a, [](T bi, T ci){ return bi+startScalar*ci; });
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}
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template <class T>
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T STDStream<T>::dot()
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{
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// sum = 0; sum += a[i]*b[i]; return sum;
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return std::transform_reduce(exe_policy, a, a+array_size, b, 0.0);
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}
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void listDevices(void)
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{
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std::cout << "Listing devices is not supported by the Parallel STL" << std::endl;
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}
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std::string getDeviceName(const int)
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{
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return std::string("Device name unavailable");
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}
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std::string getDeviceDriver(const int)
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{
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return std::string("Device driver unavailable");
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}
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template class STDStream<float>;
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template class STDStream<double>;
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