ceph/src/boost/libs/compute/perf/perf_bolt_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 <iostream>
  12 #include <algorithm>
  13 #include <vector>
  14
  15 #include <bolt/cl/copy.h>
  16 #include <bolt/cl/device_vector.h>
  17 #include <bolt/cl/reduce_by_key.h>
  18
  19 #include "perf.hpp"
  20
  21 int rand_int()
  22 {
  23     return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
  24 }
  25
  26 struct unique_key {
  27   int current;
  28   int avgValuesNoPerKey;
  29
  30   unique_key()
  31   {
  32       current = 0;
  33       avgValuesNoPerKey = 512;
  34   }
  35
  36   int operator()()
  37   {
  38       double p = double(1.0) / static_cast<double>(avgValuesNoPerKey);
  39       if((rand() / double(RAND_MAX)) <= p)
  40           return ++current;
  41       return current;
  42   }
  43 } UniqueKey;
  44
  45 int main(int argc, char *argv[])
  46 {
  47     perf_parse_args(argc, argv);
  48
  49     std::cout << "size: " << PERF_N << std::endl;
  50
  51     bolt::cl::control ctrl = bolt::cl::control::getDefault();
  52     ::cl::Device device = ctrl.getDevice();
  53     std::cout << "device: " << device.getInfo<CL_DEVICE_NAME>() << std::endl;
  54
  55     // create vector of keys and random values
  56     std::vector<int> host_keys(PERF_N);
  57     std::vector<int> host_values(PERF_N);
  58     std::generate(host_keys.begin(), host_keys.end(), UniqueKey);
  59     std::generate(host_values.begin(), host_values.end(), rand_int);
  60
  61     // create device vectors for data
  62     bolt::cl::device_vector<int> device_keys(PERF_N);
  63     bolt::cl::device_vector<int> device_values(PERF_N);
  64
  65     // transfer data to the device
  66     bolt::cl::copy(host_keys.begin(), host_keys.end(), device_keys.begin());
  67     bolt::cl::copy(host_values.begin(), host_values.end(), device_values.begin());
  68
  69     // create device vectors for the results
  70     bolt::cl::device_vector<int> device_keys_results(PERF_N);
  71     bolt::cl::device_vector<int> device_values_results(PERF_N);
  72
  73     typedef bolt::cl::device_vector<int>::iterator iterType;
  74     bolt::cl::pair<iterType, iterType> result = {
  75         device_keys_results.begin(),
  76         device_values_results.begin()
  77     };
  78
  79     perf_timer t;
  80     for(size_t trial = 0; trial < PERF_TRIALS; trial++){
  81         t.start();
  82         result = bolt::cl::reduce_by_key(device_keys.begin(),
  83                                          device_keys.end(),
  84                                          device_values.begin(),
  85                                          device_keys_results.begin(),
  86                                          device_values_results.begin());
  87         t.stop();
  88     }
  89     std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
  90
  91     size_t result_size = bolt::cl::distance(device_keys_results.begin(), result.first);
  92     if(result_size != static_cast<size_t>(host_keys[PERF_N-1] + 1)){
  93         std::cout << "ERROR: "
  94                   << "wrong number of keys"
  95                   << std::endl;
  96         return -1;
  97     }
  98
  99     return 0;
 100 }