59 lines
1.6 KiB
C++
59 lines
1.6 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 "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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// 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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// 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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// result
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std::vector<int>::iterator host_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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host_result_it = std::find(host_vector.begin(), host_vector.end(), wanted);
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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
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if(host_result_it != host_vector.end()){
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std::cout << "ERROR: "
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<< "host_result_iterator != "
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<< "host_vector.end()"
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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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