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//---------------------------------------------------------------------------//
// Copyright (c) 2014 Roshan <thisisroshansmail@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 <boost/compute/algorithm/next_permutation.hpp>
#include <boost/compute/algorithm/prev_permutation.hpp>
#include <boost/compute/container/vector.hpp>
#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;
// setup context and queue for the default device
boost::compute::device device = boost::compute::system::default_device();
boost::compute::context context(device);
boost::compute::command_queue queue(context, device);
std::cout << "device: " << device.name() << std::endl;
// create vector of random numbers on the host
std::vector<int> host_vector(PERF_N);
std::generate(host_vector.begin(), host_vector.end(), rand_int);
std::sort(host_vector.begin(), host_vector.end());
// create vector on the device and copy the data
boost::compute::vector<int> device_vector(PERF_N, context);
boost::compute::copy(
host_vector.begin(), host_vector.end(), device_vector.begin(), queue
);
perf_timer t;
for(size_t trial = 0; trial < PERF_TRIALS; trial++){
t.start();
boost::compute::prev_permutation(
device_vector.begin(), device_vector.end(), queue
);
queue.finish();
t.stop();
boost::compute::next_permutation(
device_vector.begin(), device_vector.end(), queue
);
}
std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
return 0;
}
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