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1 | //---------------------------------------------------------------------------// |
2 | // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@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 | //[time_copy_example | |
12 | ||
13 | #include <vector> | |
14 | #include <cstdlib> | |
15 | #include <iostream> | |
16 | ||
17 | #include <boost/compute/event.hpp> | |
18 | #include <boost/compute/system.hpp> | |
19 | #include <boost/compute/algorithm/copy.hpp> | |
20 | #include <boost/compute/async/future.hpp> | |
21 | #include <boost/compute/container/vector.hpp> | |
22 | ||
23 | namespace compute = boost::compute; | |
24 | ||
25 | int main() | |
26 | { | |
27 | // get the default device | |
28 | compute::device gpu = compute::system::default_device(); | |
29 | ||
30 | // create context for default device | |
31 | compute::context context(gpu); | |
32 | ||
33 | // create command queue with profiling enabled | |
34 | compute::command_queue queue( | |
35 | context, gpu, compute::command_queue::enable_profiling | |
36 | ); | |
37 | ||
38 | // generate random data on the host | |
39 | std::vector<int> host_vector(16000000); | |
40 | std::generate(host_vector.begin(), host_vector.end(), rand); | |
41 | ||
42 | // create a vector on the device | |
43 | compute::vector<int> device_vector(host_vector.size(), context); | |
44 | ||
45 | // copy data from the host to the device | |
46 | compute::future<void> future = compute::copy_async( | |
47 | host_vector.begin(), host_vector.end(), device_vector.begin(), queue | |
48 | ); | |
49 | ||
50 | // wait for copy to finish | |
51 | future.wait(); | |
52 | ||
53 | // get elapsed time from event profiling information | |
54 | boost::chrono::milliseconds duration = | |
55 | future.get_event().duration<boost::chrono::milliseconds>(); | |
56 | ||
57 | // print elapsed time in milliseconds | |
58 | std::cout << "time: " << duration.count() << " ms" << std::endl; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | //] |