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 <boost/compute/system.hpp>
17 #include <boost/compute/lambda.hpp>
18 #include <boost/compute/algorithm/detail/binary_find.hpp>
19 #include <boost/compute/algorithm/partition.hpp>
20 #include <boost/compute/container/vector.hpp>
21
22 #include "perf.hpp"
23
rand_int()24 int rand_int()
25 {
26 return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
27 }
28
main(int argc,char * argv[])29 int main(int argc, char *argv[])
30 {
31 perf_parse_args(argc, argv);
32 std::cout << "size: " << PERF_N << std::endl;
33
34 // setup context and queue for the default device
35 boost::compute::device device = boost::compute::system::default_device();
36 boost::compute::context context(device);
37 boost::compute::command_queue queue(context, device);
38 std::cout << "device: " << device.name() << std::endl;
39
40 // create vector of random numbers on the host
41 std::vector<int> host_vector(PERF_N);
42 std::generate(host_vector.begin(), host_vector.end(), rand_int);
43
44 // create vector on the device and copy the data
45 boost::compute::vector<int> device_vector(PERF_N, context);
46 boost::compute::copy(
47 host_vector.begin(), host_vector.end(), device_vector.begin(), queue
48 );
49
50 using boost::compute::_1;
51 boost::compute::partition(
52 device_vector.begin(), device_vector.end(), _1 < 20, queue
53 );
54
55 // just to be sure everything is finished before measuring execution time
56 // of binary_find algorithm
57 queue.finish();
58
59 perf_timer t;
60 for(size_t trial = 0; trial < PERF_TRIALS; trial++){
61 t.start();
62 boost::compute::detail::binary_find(
63 device_vector.begin(), device_vector.end(), _1 >= 20, queue
64 );
65 queue.finish();
66 t.stop();
67 }
68 std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
69
70 return 0;
71 }
72