// Copyright Oliver Kowalke 2009. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #include <cstddef> #include <cstdlib> #include <iostream> #include <stdexcept> #include <windows.h> #include <boost/chrono.hpp> #include <boost/cstdint.hpp> #include <boost/program_options.hpp> #include "../bind_processor.hpp" #include "../clock.hpp" #include "../cycle.hpp" #include "../../example/simple_stack_allocator.hpp" typedef boost::context::simple_stack_allocator< 8 * 1024 * 1024, 64 * 1024, 8 * 1024 > stack_allocator; boost::uint64_t jobs = 1000; LPVOID fc, fm; VOID __stdcall fn( LPVOID) { while ( true) ::SwitchToFiber( fm); } duration_type measure_time() { // cache warum-up ::SwitchToFiber( fc); time_point_type start( clock_type::now() ); for ( std::size_t i = 0; i < jobs; ++i) { ::SwitchToFiber( fc); } duration_type total = clock_type::now() - start; total -= overhead_clock(); // overhead of measurement total /= jobs; // loops total /= 2; // 2x jump_fcontext return total; } #ifdef BOOST_CONTEXT_CYCLE cycle_type measure_cycles() { // cache warum-up ::SwitchToFiber( fc); cycle_type start( cycles() ); for ( std::size_t i = 0; i < jobs; ++i) { ::SwitchToFiber( fc); } cycle_type total = cycles() - start; total -= overhead_cycle(); // overhead of measurement total /= jobs; // loops total /= 2; // 2x jump_fcontext return total; } #endif int main( int argc, char * argv[]) { try { bind_to_processor( 0); boost::program_options::options_description desc("allowed options"); desc.add_options() ("help", "help message") ("jobs,j", boost::program_options::value< boost::uint64_t >( & jobs), "jobs to run"); boost::program_options::variables_map vm; boost::program_options::store( boost::program_options::parse_command_line( argc, argv, desc), vm); boost::program_options::notify( vm); if ( vm.count("help") ) { std::cout << desc << std::endl; return EXIT_SUCCESS; } fm = ::ConvertThreadToFiber( 0); fc = ::CreateFiber( stack_allocator::default_stacksize(), fn, 0); boost::uint64_t res = measure_time().count(); std::cout << "average of " << res << " nano seconds" << std::endl; #ifdef BOOST_CONTEXT_CYCLE res = measure_cycles(); std::cout << "average of " << res << " cpu cycles" << std::endl; #endif return EXIT_SUCCESS; } catch ( std::exception const& e) { std::cerr << "exception: " << e.what() << std::endl; } catch (...) { std::cerr << "unhandled exception" << std::endl; } return EXIT_FAILURE; }