1 //---------------------------------------------------------------------------//
2 // Copyright (c) 2014 Roshan <thisisroshansmail@gmail.com>
3 //
4 // Distributed under the Boost Software License, Version 1.0
5 // See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt
7 //
8 // See http://boostorg.github.com/compute for more information.
9 //---------------------------------------------------------------------------//
10
11 #include <algorithm>
12 #include <iostream>
13 #include <numeric>
14 #include <vector>
15
16 #include "perf.hpp"
17
rand_int()18 int rand_int()
19 {
20 return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
21 }
22
less_than_20(int value)23 bool less_than_20(int value)
24 {
25 return value < 20;
26 }
27
main(int argc,char * argv[])28 int main(int argc, char *argv[])
29 {
30 perf_parse_args(argc, argv);
31 std::cout << "size: " << PERF_N << std::endl;
32
33 // create vector of random numbers on the host
34 std::vector<int> host_vector(PERF_N);
35 std::generate(host_vector.begin(), host_vector.end(), rand_int);
36 std::partition(host_vector.begin(), host_vector.end(),
37 less_than_20);
38 perf_timer t;
39 for(size_t trial = 0; trial < PERF_TRIALS; trial++){
40 t.start();
41 std::partition_point(host_vector.begin(), host_vector.end(),
42 less_than_20);
43 t.stop();
44 }
45 std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
46
47 return 0;
48 }
49