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- // 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 <cstdlib>
- #include <iostream>
- #include <stdexcept>
- #include <boost/chrono.hpp>
- #include <boost/coroutine/all.hpp>
- #include <boost/cstdint.hpp>
- #include <boost/program_options.hpp>
- #include "../bind_processor.hpp"
- #include "../clock.hpp"
- #include "../cycle.hpp"
- typedef boost::coroutines::protected_stack_allocator stack_allocator;
- typedef boost::coroutines::asymmetric_coroutine< void > coro_type;
- boost::coroutines::flag_fpu_t preserve_fpu = boost::coroutines::fpu_not_preserved;
- boost::coroutines::flag_unwind_t unwind_stack = boost::coroutines::stack_unwind;
- boost::uint64_t jobs = 1000;
- void fn( coro_type::push_type & c)
- { while ( true) c(); }
- duration_type measure_time( duration_type overhead)
- {
- stack_allocator stack_alloc;
- time_point_type start( clock_type::now() );
- for ( std::size_t i = 0; i < jobs; ++i) {
- coro_type::pull_type c( fn,
- boost::coroutines::attributes( unwind_stack, preserve_fpu), stack_alloc);
- }
- duration_type total = clock_type::now() - start;
- total -= overhead_clock(); // overhead of measurement
- total /= jobs; // loops
- return total;
- }
- # ifdef BOOST_CONTEXT_CYCLE
- cycle_type measure_cycles( cycle_type overhead)
- {
- stack_allocator stack_alloc;
- cycle_type start( cycles() );
- for ( std::size_t i = 0; i < jobs; ++i) {
- coro_type::pull_type c( fn,
- boost::coroutines::attributes( unwind_stack, preserve_fpu), stack_alloc);
- }
- cycle_type total = cycles() - start;
- total -= overhead; // overhead of measurement
- total /= jobs; // loops
- return total;
- }
- # endif
- int main( int argc, char * argv[])
- {
- try
- {
- bool preserve = false, unwind = true, bind = false;
- boost::program_options::options_description desc("allowed options");
- desc.add_options()
- ("help", "help message")
- ("bind,b", boost::program_options::value< bool >( & bind), "bind thread to CPU")
- ("fpu,f", boost::program_options::value< bool >( & preserve), "preserve FPU registers")
- ("unwind,u", boost::program_options::value< bool >( & unwind), "unwind coroutine-stack")
- ("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;
- }
- if ( preserve) preserve_fpu = boost::coroutines::fpu_preserved;
- if ( ! unwind) unwind_stack = boost::coroutines::no_stack_unwind;
- if ( bind) bind_to_processor( 0);
- duration_type overhead_c = overhead_clock();
- std::cout << "overhead " << overhead_c.count() << " nano seconds" << std::endl;
- boost::uint64_t res = measure_time( overhead_c).count();
- std::cout << "average of " << res << " nano seconds" << std::endl;
- #ifdef BOOST_CONTEXT_CYCLE
- cycle_type overhead_y = overhead_cycle();
- std::cout << "overhead " << overhead_y << " cpu cycles" << std::endl;
- res = measure_cycles( overhead_y);
- 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;
- }
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