ceph/src/boost/libs/fiber/performance/fiber/scale_join.cpp

   1
   2 //          Copyright Oliver Kowalke 2009.
   3 // Distributed under the Boost Software License, Version 1.0.
   4 //    (See accompanying file LICENSE_1_0.txt or copy at
   5 //          http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <cstdlib>
   8 #include <iostream>
   9 #include <stdexcept>
  10
  11 #include <boost/cstdint.hpp>
  12 #include <boost/fiber/all.hpp>
  13 #include <boost/preprocessor.hpp>
  14
  15 #include "../clock.hpp"
  16
  17 #define CREATE(z, n, _) \
  18     boost::fibers::fiber BOOST_PP_CAT(f,n) (worker);
  19 #define JOIN(z, n, _) \
  20     BOOST_PP_CAT(f,n) .join();
  21
  22 void worker() {}
  23
  24 duration_type measure10( duration_type overhead) {
  25     boost::fibers::fiber( worker).join();
  26     BOOST_PP_REPEAT_FROM_TO(1, 10, CREATE, _);
  27     time_point_type start( clock_type::now() );
  28     BOOST_PP_REPEAT_FROM_TO(1, 10, JOIN, _);
  29     duration_type total = clock_type::now() - start;
  30     total -= overhead_clock(); // overhead of measurement
  31     total /= 10;  // loops
  32     return total;
  33 }
  34
  35 duration_type measure50( duration_type overhead) {
  36     boost::fibers::fiber( worker).join();
  37     BOOST_PP_REPEAT_FROM_TO(1, 50, CREATE, _);
  38     time_point_type start( clock_type::now() );
  39     BOOST_PP_REPEAT_FROM_TO(1, 50, JOIN, _);
  40     duration_type total = clock_type::now() - start;
  41     total -= overhead_clock(); // overhead of measurement
  42     total /= 50;  // loops
  43     return total;
  44 }
  45
  46 duration_type measure100( duration_type overhead) {
  47     boost::fibers::fiber( worker).join();
  48     BOOST_PP_REPEAT_FROM_TO(1, 100, CREATE, _);
  49     time_point_type start( clock_type::now() );
  50     BOOST_PP_REPEAT_FROM_TO(1, 100, JOIN, _);
  51     duration_type total = clock_type::now() - start;
  52     total -= overhead_clock(); // overhead of measurement
  53     total /= 100;  // loops
  54     return total;
  55 }
  56
  57 duration_type measure500( duration_type overhead) {
  58     boost::fibers::fiber( worker).join();
  59 #include "fiber_create_500.ipp"
  60     time_point_type start( clock_type::now() );
  61 #include "fiber_join_500.ipp"
  62     duration_type total = clock_type::now() - start;
  63     total -= overhead_clock(); // overhead of measurement
  64     total /= 500;  // loops
  65     return total;
  66 }
  67
  68 duration_type measure1000( duration_type overhead) {
  69     boost::fibers::fiber( worker).join();
  70 #include "fiber_create_1000.ipp"
  71     time_point_type start( clock_type::now() );
  72 #include "fiber_join_1000.ipp"
  73     duration_type total = clock_type::now() - start;
  74     total -= overhead_clock(); // overhead of measurement
  75     total /= 1000;  // loops
  76     return total;
  77 }
  78
  79 duration_type measure5000( duration_type overhead) {
  80     boost::fibers::fiber( worker).join();
  81 #include "fiber_create_5000.ipp"
  82     time_point_type start( clock_type::now() );
  83 #include "fiber_join_5000.ipp"
  84     duration_type total = clock_type::now() - start;
  85     total -= overhead_clock(); // overhead of measurement
  86     total /= 5000;  // loops
  87     return total;
  88 }
  89
  90 duration_type measure10000( duration_type overhead) {
  91     boost::fibers::fiber( worker).join();
  92 #include "fiber_create_10000.ipp"
  93     time_point_type start( clock_type::now() );
  94 #include "fiber_join_10000.ipp"
  95     duration_type total = clock_type::now() - start;
  96     total -= overhead_clock(); // overhead of measurement
  97     total /= 10000;  // loops
  98     return total;
  99 }
 100
 101 int main( int argc, char * argv[]) {
 102     try {
 103         duration_type overhead = overhead_clock();
 104         boost::uint64_t res = measure10( overhead).count();
 105         std::cout << "10 jobs: average of " << res << " nano seconds" << std::endl;
 106         res = measure50( overhead).count();
 107         std::cout << "50 jobs: average of " << res << " nano seconds" << std::endl;
 108         res = measure100( overhead).count();
 109         std::cout << "100 jobs: average of " << res << " nano seconds" << std::endl;
 110         res = measure500( overhead).count();
 111         std::cout << "500 jobs: average of " << res << " nano seconds" << std::endl;
 112         res = measure1000( overhead).count();
 113         std::cout << "1000 jobs: average of " << res << " nano seconds" << std::endl;
 114         res = measure5000( overhead).count();
 115         std::cout << "5000 jobs: average of " << res << " nano seconds" << std::endl;
 116         res = measure10000( overhead).count();
 117         std::cout << "10000 jobs: average of " << res << " nano seconds" << std::endl;
 118         return EXIT_SUCCESS;
 119     } catch ( std::exception const& e) {
 120         std::cerr << "exception: " << e.what() << std::endl;
 121     } catch (...) {
 122         std::cerr << "unhandled exception" << std::endl;
 123     }
 124     return EXIT_FAILURE;
 125 }