1 //---------------------------------------------------------------------------//
2 // Copyright (c) 2015 Jakub Szuppe <j.szuppe@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 <vector>
14
15 #include <boost/compute/system.hpp>
16 #include <boost/compute/algorithm/find.hpp>
17 #include <boost/compute/container/vector.hpp>
18
19 #include "perf.hpp"
20
21 // Max integer that can be generated by rand_int() function.
22 int rand_int_max = 25;
23
rand_int()24 int rand_int()
25 {
26 return static_cast<int>((rand() / double(RAND_MAX)) * rand_int_max);
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(),
48 host_vector.end(),
49 device_vector.begin(),
50 queue
51 );
52
53 // trying to find element that isn't in vector (worst-case scenario)
54 int wanted = rand_int_max + 1;
55
56 // device iterator
57 boost::compute::vector<int>::iterator device_result_it;
58
59 perf_timer t;
60 for(size_t trial = 0; trial < PERF_TRIALS; trial++){
61 t.start();
62 device_result_it = boost::compute::find(device_vector.begin(),
63 device_vector.end(),
64 wanted,
65 queue);
66 queue.finish();
67 t.stop();
68 }
69 std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
70
71 // verify if found index is correct by comparing it with std::find() result
72 size_t host_result_index = std::distance(host_vector.begin(),
73 std::find(host_vector.begin(),
74 host_vector.end(),
75 wanted));
76 size_t device_result_index = device_result_it.get_index();
77
78 if(device_result_index != host_result_index){
79 std::cout << "ERROR: "
80 << "device_result_index (" << device_result_index << ") "
81 << "!= "
82 << "host_result_index (" << host_result_index << ")"
83 << std::endl;
84 return -1;
85 }
86
87 return 0;
88 }
89