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/detail/lightweight_main.hpp>
  24
  25 namespace fs = boost::filesystem;
  26 using namespace boost::timer;
  27
  28 #include <fstream>
  29 #include <iostream>
  30
  31 using std::cout;
  32 using std::endl;
  33
  34 namespace {
  35 boost::int64_t max_cycles;
  36
  37 template< class STD_STRING >
  38 nanosecond_type time_ctor(const STD_STRING& s)
  39 {
  40     boost::timer::auto_cpu_timer tmr;
  41     boost::int64_t count = 0;
  42     do
  43     {
  44         fs::path p(s);
  45         ++count;
  46     } while (count < max_cycles);
  47
  48     boost::timer::cpu_times elapsed = tmr.elapsed();
  49     return elapsed.user + elapsed.system;
  50 }
  51
  52 nanosecond_type time_loop()
  53 {
  54     boost::timer::auto_cpu_timer tmr;
  55     boost::int64_t count = 0;
  56     do
  57     {
  58         ++count;
  59     } while (count < max_cycles);
  60
  61     boost::timer::cpu_times elapsed = tmr.elapsed();
  62     return elapsed.user + elapsed.system;
  63 }
  64 } // unnamed namespace
  65
  66 //--------------------------------------------------------------------------------------//
  67 //                                      main                                            //
  68 //--------------------------------------------------------------------------------------//
  69
  70 int cpp_main(int argc, char* argv[])
  71 {
  72     if (argc != 2)
  73     {
  74         cout << "Usage: path_times <cycles-in-millions>\n";
  75         return 1;
  76     }
  77
  78     max_cycles = std::atoi(argv[1]) * 1000000LL;
  79     cout << "testing " << std::atoi(argv[1]) << " million cycles" << endl;
  80
  81     cout << "time_loop" << endl;
  82     nanosecond_type x = time_loop();
  83
  84     cout << "time_ctor with string" << endl;
  85     nanosecond_type s = time_ctor(std::string("/foo/bar/baz"));
  86
  87     cout << "time_ctor with wstring" << endl;
  88     nanosecond_type w = time_ctor(std::wstring(L"/foo/bar/baz"));
  89
  90     if (s > w)
  91         cout << "narrow/wide CPU-time ratio = " << long double(s) / w << endl;
  92     else
  93         cout << "wide/narrow CPU-time ratio = " << long double(w) / s << endl;
  94
  95     cout << "returning from main()" << endl;
  96     return 0;
  97 }