EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/compute/perf/perf_stl_partial_sum.cpp

//---------------------------------------------------------------------------//
// 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 <algorithm>
#include <iostream>
#include <numeric>
#include <vector>

#include <boost/compute/system.hpp>

#include "perf.hpp"

int rand_int()
{
    return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
}

int main(int argc, char *argv[])
{
    using boost::compute::int_;

    perf_parse_args(argc, argv);

    std::cout << "size: " << PERF_N << std::endl;

    // create vector of random numbers on the host
    std::vector<int_> v(PERF_N);
    std::vector<int_> r(PERF_N);

    perf_timer t;
    for(size_t trial = 0; trial < PERF_TRIALS; trial++){
        std::generate(v.begin(), v.end(), rand_int);
        t.start();
        std::partial_sum(
            v.begin(),
            v.end(),
            r.begin()
        );
        t.stop();
    }
    std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;

    return 0;
}