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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/host_vector.h>
- #include <thrust/set_operations.h>
- #include <thrust/sort.h>
- #include "perf.hpp"
- int rand_int()
- {
- return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
- }
- int main(int argc, char *argv[])
- {
- perf_parse_args(argc, argv);
- std::cout << "size: " << PERF_N << std::endl;
- thrust::host_vector<int> v1(std::floor(PERF_N / 2.0));
- thrust::host_vector<int> v2(std::ceil(PERF_N / 2.0));
- std::generate(v1.begin(), v1.end(), rand_int);
- std::generate(v2.begin(), v2.end(), rand_int);
- std::sort(v1.begin(), v1.end());
- std::sort(v2.begin(), v2.end());
- // transfer data to the device
- thrust::device_vector<int> gpu_v1 = v1;
- thrust::device_vector<int> gpu_v2 = v2;
- thrust::device_vector<int> gpu_v3(PERF_N);
- thrust::device_vector<int>::iterator gpu_v3_end;
- perf_timer t;
- for(size_t trial = 0; trial < PERF_TRIALS; trial++){
- t.start();
- gpu_v3_end = thrust::set_difference(
- gpu_v1.begin(), gpu_v1.end(),
- gpu_v2.begin(), gpu_v2.end(),
- gpu_v3.begin()
- );
- cudaDeviceSynchronize();
- t.stop();
- }
- std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
- std::cout << "size: " << thrust::distance(gpu_v3.begin(), gpu_v3_end) << std::endl;
- return 0;
- }
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