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

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@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 <vector>
  14
  15 #include <boost/compute/system.hpp>
  16 #include <boost/compute/algorithm/count.hpp>
  17 #include <boost/compute/container/vector.hpp>
  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 int main(int argc, char *argv[])
  27 {
  28     perf_parse_args(argc, argv);
  29     std::cout << "size: " << PERF_N << std::endl;
  30
  31     // setup context and queue for the default device
  32     boost::compute::device device = boost::compute::system::default_device();
  33     boost::compute::context context(device);
  34     boost::compute::command_queue queue(context, device);
  35     std::cout << "device: " << device.name() << std::endl;
  36
  37     // create vector of random numbers on the host
  38     std::vector<int> host_vector(PERF_N);
  39     std::generate(host_vector.begin(), host_vector.end(), rand_int);
  40
  41     // create vector on the device and copy the data
  42     boost::compute::vector<int> device_vector(PERF_N, context);
  43     boost::compute::copy(
  44         host_vector.begin(),
  45         host_vector.end(),
  46         device_vector.begin(),
  47         queue
  48     );
  49
  50     size_t count = 0;
  51     perf_timer t;
  52     for(size_t trial = 0; trial < PERF_TRIALS; trial++){
  53         t.start();
  54         count = boost::compute::count(
  55             device_vector.begin(), device_vector.end(), 4, queue
  56         );
  57         queue.finish();
  58         t.stop();
  59     }
  60     std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
  61     std::cout << "count: " << count << std::endl;
  62
  63     // verify count is correct
  64     size_t host_count = std::count(host_vector.begin(),
  65                                    host_vector.end(),
  66                                    4);
  67     if(count != host_count){
  68         std::cout << "ERROR: "
  69                   << "device_count (" << count << ") "
  70                   << "!= "
  71                   << "host_count (" << host_count << ")"
  72                   << std::endl;
  73         return -1;
  74     }
  75
  76     return 0;
  77 }