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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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