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