93 lines
2.7 KiB
Plaintext
93 lines
2.7 KiB
Plaintext
//---------------------------------------------------------------------------//
|
|
// 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;
|
|
}
|