ceph/src/boost/libs/compute/perf/perf_reduce_by_key.cpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2015 Jakub Szuppe <j.szuppe@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 #include <algorithm>
  12 #include <iostream>
  13 #include <numeric>
  14 #include <vector>
  15
  16 #include <boost/compute/system.hpp>
  17 #include <boost/compute/algorithm/fill.hpp>
  18 #include <boost/compute/algorithm/reduce_by_key.hpp>
  19 #include <boost/compute/container/vector.hpp>
  20
  21 #include "perf.hpp"
  22
  23 int rand_int()
  24 {
  25     return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
  26 }
  27
  28 struct unique_key {
  29   int current;
  30   int avgValuesNoPerKey;
  31
  32   unique_key()
  33   {
  34       current = 0;
  35       avgValuesNoPerKey = 512;
  36   }
  37
  38   int operator()()
  39   {
  40       double p = double(1.0) / static_cast<double>(avgValuesNoPerKey);
  41       if((rand() / double(RAND_MAX)) <= p)
  42           return ++current;
  43       return current;
  44   }
  45 } UniqueKey;
  46
  47 int main(int argc, char *argv[])
  48 {
  49     perf_parse_args(argc, argv);
  50
  51     std::cout << "size: " << PERF_N << std::endl;
  52
  53     // setup context and queue for the default device
  54     boost::compute::device device = boost::compute::system::default_device();
  55     boost::compute::context context(device);
  56     boost::compute::command_queue queue(context, device);
  57     std::cout << "device: " << device.name() << std::endl;
  58
  59     // create vector of keys and random values
  60     std::vector<int> host_keys(PERF_N);
  61     std::vector<int> host_values(PERF_N);
  62     std::generate(host_keys.begin(), host_keys.end(), UniqueKey);
  63     std::generate(host_values.begin(), host_values.end(), rand_int);
  64
  65     // create vectors for keys and values on the device and copy the data
  66     boost::compute::vector<int> device_keys(PERF_N, context);
  67     boost::compute::vector<int> device_values(PERF_N,context);
  68     boost::compute::copy(
  69         host_keys.begin(),
  70         host_keys.end(),
  71         device_keys.begin(),
  72         queue
  73     );
  74     boost::compute::copy(
  75         host_values.begin(),
  76         host_values.end(),
  77         device_values.begin(),
  78         queue
  79     );
  80
  81     // vectors for the results
  82     boost::compute::vector<int> device_keys_results(PERF_N, context);
  83     boost::compute::vector<int> device_values_results(PERF_N,context);
  84
  85     typedef boost::compute::vector<int>::iterator iterType;
  86     std::pair<iterType, iterType> result(
  87         device_keys_results.begin(),
  88         device_values_results.begin()
  89     );
  90
  91     // reduce by key
  92     perf_timer t;
  93     for(size_t trial = 0; trial < PERF_TRIALS; trial++){
  94         t.start();
  95         result = boost::compute::reduce_by_key(device_keys.begin(),
  96                                                device_keys.end(),
  97                                                device_values.begin(),
  98                                                device_keys_results.begin(),
  99                                                device_values_results.begin(),
 100                                                queue);
 101         t.stop();
 102     }
 103     std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
 104
 105     size_t result_size = std::distance(device_keys_results.begin(), result.first);
 106     if(result_size != static_cast<size_t>(host_keys[PERF_N-1] + 1)){
 107         std::cout << "ERROR: "
 108                   << "wrong number of keys" << result_size << "\n" << (host_keys[PERF_N-1] + 1)
 109                   << std::endl;
 110         return -1;
 111     }
 112
 113     return 0;
 114 }