64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
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//---------------------------------------------------------------------------//
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// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@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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//[time_copy_example
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#include <vector>
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#include <cstdlib>
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#include <iostream>
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#include <boost/compute/event.hpp>
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#include <boost/compute/system.hpp>
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#include <boost/compute/algorithm/copy.hpp>
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#include <boost/compute/async/future.hpp>
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#include <boost/compute/container/vector.hpp>
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namespace compute = boost::compute;
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int main()
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{
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// get the default device
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compute::device gpu = compute::system::default_device();
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// create context for default device
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compute::context context(gpu);
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// create command queue with profiling enabled
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compute::command_queue queue(
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context, gpu, compute::command_queue::enable_profiling
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);
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// generate random data on the host
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std::vector<int> host_vector(16000000);
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std::generate(host_vector.begin(), host_vector.end(), rand);
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// create a vector on the device
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compute::vector<int> device_vector(host_vector.size(), context);
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// copy data from the host to the device
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compute::future<void> future = compute::copy_async(
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host_vector.begin(), host_vector.end(), device_vector.begin(), queue
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);
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// wait for copy to finish
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future.wait();
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// get elapsed time from event profiling information
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boost::chrono::milliseconds duration =
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future.get_event().duration<boost::chrono::milliseconds>();
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// print elapsed time in milliseconds
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std::cout << "time: " << duration.count() << " ms" << std::endl;
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return 0;
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}
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//]
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