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//---------------------------------------------------------------------------//
// Copyright (c) 2015 Jakub Szuppe <j.szuppe@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://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//
#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <thrust/copy.h>
#include <thrust/device_vector.h>
#include <thrust/generate.h>
#include <thrust/host_vector.h>
#include <thrust/reduce.h>
#include "perf.hpp"
int rand_int()
{
return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
}
struct unique_key {
int current;
int avgValuesNoPerKey;
unique_key()
{
current = 0;
avgValuesNoPerKey = 512;
}
int operator()()
{
double p = double(1.0) / static_cast<double>(avgValuesNoPerKey);
if((rand() / double(RAND_MAX)) <= p)
return ++current;
return current;
}
} UniqueKey;
int main(int argc, char *argv[])
{
perf_parse_args(argc, argv);
std::cout << "size: " << PERF_N << std::endl;
// create vector of keys and random values
thrust::host_vector<int> host_keys(PERF_N);
thrust::host_vector<int> host_values(PERF_N);
std::generate(host_keys.begin(), host_keys.end(), UniqueKey);
std::generate(host_values.begin(), host_values.end(), rand_int);
// transfer data to the device
thrust::device_vector<int> device_keys = host_keys;
thrust::device_vector<int> device_values = host_values;
// create device vectors for the results
thrust::device_vector<int> device_keys_results(PERF_N);
thrust::device_vector<int> device_values_results(PERF_N);
typedef typename thrust::device_vector<int>::iterator iterType;
thrust::pair<iterType, iterType> result;
perf_timer t;
for(size_t trial = 0; trial < PERF_TRIALS; trial++){
t.start();
result = thrust::reduce_by_key(device_keys.begin(),
device_keys.end(),
device_values.begin(),
device_keys_results.begin(),
device_values_results.begin());
cudaDeviceSynchronize();
t.stop();
}
std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
size_t result_size = thrust::distance(device_keys_results.begin(), result.first);
if(result_size != static_cast<size_t>(host_keys[PERF_N-1] + 1)){
std::cout << "ERROR: "
<< "wrong number of keys"
<< std::endl;
return -1;
}
return 0;
}
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