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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/merge.h>
- #include <thrust/sort.h>
- #include "perf.hpp"
- 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);
- std::generate(v2.begin(), v2.end(), rand);
- 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);
- perf_timer t;
- for(size_t trial = 0; trial < PERF_TRIALS; trial++){
- t.start();
- thrust::merge(
- 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;
- thrust::host_vector<int> check_v3 = gpu_v3;
- thrust::host_vector<int> v3(PERF_N);
- std::merge(v1.begin(), v1.end(), v2.begin(), v2.end(), v3.begin());
- bool ok = std::equal(check_v3.begin(), check_v3.end(), v3.begin());
- if(!ok){
- std::cerr << "ERROR: merged ranges different" << std::endl;
- return -1;
- }
- return 0;
- }
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