mirror of
https://github.com/boostorg/compute.git
synced 2026-01-27 06:42:19 +00:00
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
//---------------------------------------------------------------------------//
|
|
// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0
|
|
// See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt
|
|
//
|
|
// See http://kylelutz.github.com/compute for more information.
|
|
//---------------------------------------------------------------------------//
|
|
|
|
#include <algorithm>
|
|
#include <iostream>
|
|
#include <vector>
|
|
|
|
#include <boost/compute.hpp>
|
|
|
|
int rand_int()
|
|
{
|
|
return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
size_t size = 1000;
|
|
if(argc >= 2){
|
|
size = boost::lexical_cast<size_t>(argv[1]);
|
|
}
|
|
|
|
std::cout << "size: " << size << std::endl;
|
|
|
|
// setup context and queue for the default device
|
|
boost::compute::device device = boost::compute::system::default_device();
|
|
boost::compute::context context(device);
|
|
boost::compute::command_queue queue(
|
|
context,
|
|
device,
|
|
boost::compute::command_queue::enable_profiling
|
|
);
|
|
|
|
// create vector of random numbers on the host
|
|
std::vector<int> host_vector(size);
|
|
std::generate(host_vector.begin(), host_vector.end(), rand_int);
|
|
|
|
// create vector on the device and copy the data
|
|
boost::compute::vector<int> device_vector(size, context);
|
|
boost::compute::copy(
|
|
host_vector.begin(),
|
|
host_vector.end(),
|
|
device_vector.begin(),
|
|
queue
|
|
);
|
|
|
|
// sum vector
|
|
boost::compute::timer t(queue);
|
|
boost::compute::partial_sum(device_vector.begin(),
|
|
device_vector.end(),
|
|
device_vector.begin(),
|
|
queue);
|
|
std::cout << "time: " << t.elapsed() / 1e6 << " ms" << std::endl;
|
|
|
|
// verify sum is correct
|
|
boost::compute::timer t1(queue);
|
|
std::partial_sum(host_vector.begin(),
|
|
host_vector.end(),
|
|
host_vector.begin());
|
|
std::cout << "host time: " << t1.elapsed() / 1e6 << " ms" << std::endl;
|
|
|
|
int device_sum = device_vector.back();
|
|
int host_sum = host_vector.back();
|
|
|
|
if(device_sum != host_sum){
|
|
std::cout << "ERROR: "
|
|
<< "device_sum (" << device_sum << ") "
|
|
<< "!= "
|
|
<< "host_sum (" << host_sum << ")"
|
|
<< std::endl;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|