ceph/src/boost/libs/filesystem/test/path_times.cpp

   1 //  Boost Filesystem path_times.cpp  ---------------------------------------------------//
   2
   3 //  Copyright Beman Dawes 2013
   4
   5 //  Distributed under the Boost Software License, Version 1.0.
   6 //  See http://www.boost.org/LICENSE_1_0.txt
   7
   8 //  Library home page: http://www.boost.org/libs/filesystem
   9
  10 #include <boost/config/warning_disable.hpp>
  11
  12 #ifndef BOOST_FILESYSTEM_NO_DEPRECATED
  13 #  define BOOST_FILESYSTEM_NO_DEPRECATED
  14 #endif
  15 #ifndef BOOST_SYSTEM_NO_DEPRECATED
  16 #  define BOOST_SYSTEM_NO_DEPRECATED
  17 #endif
  18
  19 #include <boost/timer/timer.hpp>
  20 #include <boost/filesystem/path.hpp>
  21 #include <boost/cstdint.hpp>
  22
  23 #include <boost/config.hpp>
  24 # if defined( BOOST_NO_STD_WSTRING )
  25 #   error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support
  26 # endif
  27
  28 #include <boost/detail/lightweight_main.hpp>
  29
  30 namespace fs = boost::filesystem;
  31 using namespace boost::timer;
  32
  33 #include <fstream>
  34 #include <iostream>
  35
  36 using std::cout;
  37 using std::endl;
  38
  39 namespace
  40 {
  41   boost::int64_t max_cycles;
  42
  43   template <class STD_STRING>
  44   nanosecond_type time_ctor(const STD_STRING& s)
  45   {
  46     boost::timer::auto_cpu_timer tmr;
  47     boost::int64_t count = 0;
  48     do
  49     {
  50       fs::path p(s);
  51       ++count;
  52     } while (count < max_cycles);
  53
  54     boost::timer::cpu_times elapsed = tmr.elapsed();
  55     return elapsed.user + elapsed.system;
  56   }
  57
  58   nanosecond_type time_loop()
  59   {
  60     boost::timer::auto_cpu_timer tmr;
  61     boost::int64_t count = 0;
  62     do
  63     {
  64       ++count;
  65     } while (count < max_cycles);
  66
  67     boost::timer::cpu_times elapsed = tmr.elapsed();
  68     return elapsed.user + elapsed.system;
  69   }
  70 }  // unnamed namespace
  71
  72 //--------------------------------------------------------------------------------------//
  73 //                                      main                                            //
  74 //--------------------------------------------------------------------------------------//
  75
  76 int cpp_main(int argc, char* argv[])
  77 {
  78   if (argc != 2)
  79   {
  80     cout << "Usage: path_times <cycles-in-millions>\n";
  81     return 1;
  82   }
  83
  84   max_cycles = std::atoi(argv[1]) * 1000000LL;
  85   cout << "testing " << std::atoi(argv[1]) << " million cycles" << endl;
  86
  87   cout << "time_loop" << endl;
  88   nanosecond_type x = time_loop();
  89
  90   cout << "time_ctor with string" << endl;
  91   nanosecond_type s = time_ctor(std::string("/foo/bar/baz"));
  92
  93   cout << "time_ctor with wstring" << endl;
  94   nanosecond_type w = time_ctor(std::wstring(L"/foo/bar/baz"));
  95
  96   if (s > w)
  97     cout << "narrow/wide CPU-time ratio = " << long double(s)/w << endl;
  98   else
  99     cout << "wide/narrow CPU-time ratio = " << long double(w)/s << endl;
 100
 101   cout << "returning from main()" << endl;
 102   return 0;
 103 }