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//---------------------------------------------------------------------------//
// Copyright (c) 2015 Jakub Szuppe <j.szuppe@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 <vector>
#include <boost/compute/system.hpp>
#include <boost/compute/algorithm/find.hpp>
#include <boost/compute/container/vector.hpp>
#include "perf.hpp"
// Max integer that can be generated by rand_int() function.
int rand_int_max = 25;
int rand_int()
{
return static_cast<int>((rand() / double(RAND_MAX)) * rand_int_max);
}
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);
// 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
);
// trying to find element that isn't in vector (worst-case scenario)
int wanted = rand_int_max + 1;
// device iterator
boost::compute::vector<int>::iterator device_result_it;
perf_timer t;
for(size_t trial = 0; trial < PERF_TRIALS; trial++){
t.start();
device_result_it = boost::compute::find(device_vector.begin(),
device_vector.end(),
wanted,
queue);
queue.finish();
t.stop();
}
std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
// verify if found index is correct by comparing it with std::find() result
size_t host_result_index = std::distance(host_vector.begin(),
std::find(host_vector.begin(),
host_vector.end(),
wanted));
size_t device_result_index = device_result_it.get_index();
if(device_result_index != host_result_index){
std::cout << "ERROR: "
<< "device_result_index (" << device_result_index << ") "
<< "!= "
<< "host_result_index (" << host_result_index << ")"
<< std::endl;
return -1;
}
return 0;
}
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