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- //---------------------------------------------------------------------------//
- // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
- //
- // Distributed under the Boost Software License, Version 1.0
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- //
- // See http://boostorg.github.com/compute for more information.
- //---------------------------------------------------------------------------//
- #include <iostream>
- #include <iterator>
- #include <algorithm>
- #include <thrust/device_vector.h>
- #include <thrust/functional.h>
- #include <thrust/host_vector.h>
- #include <thrust/transform.h>
- #include "perf.hpp"
- struct saxpy_functor : public thrust::binary_function<float,float,float>
- {
- const float a;
- saxpy_functor(float _a) : a(_a) {}
- __host__ __device__
- float operator()(const float& x, const float& y) const
- {
- return a * x + y;
- }
- };
- int main(int argc, char *argv[])
- {
- perf_parse_args(argc, argv);
- std::cout << "size: " << PERF_N << std::endl;
- thrust::host_vector<int> host_x(PERF_N);
- thrust::host_vector<int> host_y(PERF_N);
- std::generate(host_x.begin(), host_x.end(), rand);
- std::generate(host_y.begin(), host_y.end(), rand);
- // transfer data to the device
- thrust::device_vector<int> device_x = host_x;
- thrust::device_vector<int> device_y = host_y;
- perf_timer t;
- for(size_t trial = 0; trial < PERF_TRIALS; trial++){
- t.start();
- thrust::transform(device_x.begin(), device_x.end(), device_y.begin(), device_y.begin(), saxpy_functor(2.5f));
- cudaDeviceSynchronize();
- t.stop();
- }
- std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
- // transfer data back to host
- thrust::copy(device_x.begin(), device_x.end(), host_x.begin());
- thrust::copy(device_y.begin(), device_y.end(), host_y.begin());
- return 0;
- }
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