98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
// Boost Filesystem path_times.cpp ---------------------------------------------------//
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// Copyright Beman Dawes 2013
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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// Library home page: http://www.boost.org/libs/filesystem
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#include <boost/config/warning_disable.hpp>
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#ifndef BOOST_FILESYSTEM_NO_DEPRECATED
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#define BOOST_FILESYSTEM_NO_DEPRECATED
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#endif
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#ifndef BOOST_SYSTEM_NO_DEPRECATED
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#define BOOST_SYSTEM_NO_DEPRECATED
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#endif
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#include <boost/timer/timer.hpp>
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#include <boost/filesystem/path.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/detail/lightweight_main.hpp>
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namespace fs = boost::filesystem;
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using namespace boost::timer;
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#include <fstream>
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#include <iostream>
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using std::cout;
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using std::endl;
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namespace {
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boost::int64_t max_cycles;
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template< class STD_STRING >
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nanosecond_type time_ctor(const STD_STRING& s)
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{
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boost::timer::auto_cpu_timer tmr;
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boost::int64_t count = 0;
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do
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{
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fs::path p(s);
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++count;
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} while (count < max_cycles);
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boost::timer::cpu_times elapsed = tmr.elapsed();
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return elapsed.user + elapsed.system;
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}
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nanosecond_type time_loop()
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{
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boost::timer::auto_cpu_timer tmr;
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boost::int64_t count = 0;
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do
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{
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++count;
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} while (count < max_cycles);
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boost::timer::cpu_times elapsed = tmr.elapsed();
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return elapsed.user + elapsed.system;
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}
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} // unnamed namespace
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//--------------------------------------------------------------------------------------//
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// main //
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//--------------------------------------------------------------------------------------//
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int cpp_main(int argc, char* argv[])
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{
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if (argc != 2)
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{
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cout << "Usage: path_times <cycles-in-millions>\n";
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return 1;
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}
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max_cycles = std::atoi(argv[1]) * 1000000LL;
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cout << "testing " << std::atoi(argv[1]) << " million cycles" << endl;
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cout << "time_loop" << endl;
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nanosecond_type x = time_loop();
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cout << "time_ctor with string" << endl;
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nanosecond_type s = time_ctor(std::string("/foo/bar/baz"));
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cout << "time_ctor with wstring" << endl;
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nanosecond_type w = time_ctor(std::wstring(L"/foo/bar/baz"));
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if (s > w)
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cout << "narrow/wide CPU-time ratio = " << long double(s) / w << endl;
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else
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cout << "wide/narrow CPU-time ratio = " << long double(w) / s << endl;
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cout << "returning from main()" << endl;
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return 0;
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}
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