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

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2014 Roshan <thisisroshansmail@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 "perf.hpp"
  17
  18 int rand_int()
  19 {
  20     return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
  21 }
  22
  23 bool less_than_10(int value)
  24 {
  25     return value < 10;
  26 }
  27
  28 int main(int argc, char *argv[])
  29 {
  30     perf_parse_args(argc, argv);
  31     std::cout << "size: " << PERF_N << std::endl;
  32
  33     // create vector of random numbers on the host
  34     std::vector<int> host_vector(PERF_N);
  35     std::generate(host_vector.begin(), host_vector.end(), rand_int);
  36
  37     perf_timer t;
  38     for(size_t trial = 0; trial < PERF_TRIALS; trial++){
  39         t.start();
  40         std::partition(host_vector.begin(), host_vector.end(), less_than_10);
  41         t.stop();
  42     }
  43     std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
  44
  45     return 0;
  46 }