89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
//---------------------------------------------------------------------------//
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// Copyright (c) 2015 Jakub Szuppe <j.szuppe@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#include <algorithm>
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#include <iostream>
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#include <vector>
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#include <boost/compute/system.hpp>
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#include <boost/compute/algorithm/find.hpp>
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#include <boost/compute/container/vector.hpp>
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#include "perf.hpp"
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// Max integer that can be generated by rand_int() function.
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int rand_int_max = 25;
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int rand_int()
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{
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return static_cast<int>((rand() / double(RAND_MAX)) * rand_int_max);
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}
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int main(int argc, char *argv[])
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{
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perf_parse_args(argc, argv);
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std::cout << "size: " << PERF_N << std::endl;
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// setup context and queue for the default device
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boost::compute::device device = boost::compute::system::default_device();
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boost::compute::context context(device);
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boost::compute::command_queue queue(context, device);
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std::cout << "device: " << device.name() << std::endl;
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// create vector of random numbers on the host
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std::vector<int> host_vector(PERF_N);
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std::generate(host_vector.begin(), host_vector.end(), rand_int);
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// create vector on the device and copy the data
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boost::compute::vector<int> device_vector(PERF_N, context);
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boost::compute::copy(
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host_vector.begin(),
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host_vector.end(),
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device_vector.begin(),
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queue
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);
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// trying to find element that isn't in vector (worst-case scenario)
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int wanted = rand_int_max + 1;
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// device iterator
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boost::compute::vector<int>::iterator device_result_it;
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perf_timer t;
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for(size_t trial = 0; trial < PERF_TRIALS; trial++){
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t.start();
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device_result_it = boost::compute::find(device_vector.begin(),
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device_vector.end(),
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wanted,
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queue);
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queue.finish();
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t.stop();
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}
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std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
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// verify if found index is correct by comparing it with std::find() result
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size_t host_result_index = std::distance(host_vector.begin(),
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std::find(host_vector.begin(),
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host_vector.end(),
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wanted));
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size_t device_result_index = device_result_it.get_index();
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if(device_result_index != host_result_index){
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std::cout << "ERROR: "
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<< "device_result_index (" << device_result_index << ") "
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<< "!= "
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<< "host_result_index (" << host_result_index << ")"
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<< std::endl;
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return -1;
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}
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return 0;
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}
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