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// Copyright Oliver Kowalke 2014.
// 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 <string>
#include <boost/chrono.hpp>
#include <boost/coroutine2/all.hpp>
#include <boost/cstdint.hpp>
#include <boost/program_options.hpp>
#include "../bind_processor.hpp"
#include "../clock.hpp"
#include "../cycle.hpp"
boost::uint64_t jobs = 1000;
struct X
{
std::string str;
X( std::string const& str_) :
str( str_)
{}
};
const X x("abc");
void fn_void( boost::coroutines2::coroutine< void >::push_type & c)
{ while ( true) c(); }
void fn_int( boost::coroutines2::coroutine< int >::push_type & c)
{ while ( true) c( 7); }
void fn_x( boost::coroutines2::coroutine< X >::push_type & c)
{
while ( true) c( x);
}
duration_type measure_time_void( duration_type overhead)
{
boost::coroutines2::segmented_stack stack_alloc;
boost::coroutines2::coroutine< void >::pull_type c( stack_alloc, fn_void);
time_point_type start( clock_type::now() );
for ( std::size_t i = 0; i < jobs; ++i) {
c();
}
duration_type total = clock_type::now() - start;
total -= overhead_clock(); // overhead of measurement
total /= jobs; // loops
total /= 2; // 2x jump_fcontext
return total;
}
duration_type measure_time_int( duration_type overhead)
{
boost::coroutines2::segmented_stack stack_alloc;
boost::coroutines2::coroutine< int >::pull_type c( stack_alloc, fn_int);
time_point_type start( clock_type::now() );
for ( std::size_t i = 0; i < jobs; ++i) {
c();
}
duration_type total = clock_type::now() - start;
total -= overhead_clock(); // overhead of measurement
total /= jobs; // loops
total /= 2; // 2x jump_fcontext
return total;
}
duration_type measure_time_x( duration_type overhead)
{
boost::coroutines2::segmented_stack stack_alloc;
boost::coroutines2::coroutine< X >::pull_type c( stack_alloc, fn_x);
time_point_type start( clock_type::now() );
for ( std::size_t i = 0; i < jobs; ++i) {
c();
}
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_void( cycle_type overhead)
{
boost::coroutines2::segmented_stack stack_alloc;
boost::coroutines2::coroutine< void >::pull_type c( stack_alloc, fn_void);
cycle_type start( cycles() );
for ( std::size_t i = 0; i < jobs; ++i) {
c();
}
cycle_type total = cycles() - start;
total -= overhead; // overhead of measurement
total /= jobs; // loops
total /= 2; // 2x jump_fcontext
return total;
}
cycle_type measure_cycles_int( cycle_type overhead)
{
boost::coroutines2::segmented_stack stack_alloc;
boost::coroutines2::coroutine< int >::pull_type c( stack_alloc, fn_int);
cycle_type start( cycles() );
for ( std::size_t i = 0; i < jobs; ++i) {
c();
}
cycle_type total = cycles() - start;
total -= overhead; // overhead of measurement
total /= jobs; // loops
total /= 2; // 2x jump_fcontext
return total;
}
cycle_type measure_cycles_x( cycle_type overhead)
{
boost::coroutines2::segmented_stack stack_alloc;
boost::coroutines2::coroutine< X >::pull_type c( stack_alloc, fn_x);
cycle_type start( cycles() );
for ( std::size_t i = 0; i < jobs; ++i) {
c();
}
cycle_type total = cycles() - start;
total -= overhead; // overhead of measurement
total /= jobs; // loops
total /= 2; // 2x jump_fcontext
return total;
}
# endif
int main( int argc, char * argv[])
{
try
{
bool 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")
("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 ( 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_void( overhead_c).count();
std::cout << "void: average of " << res << " nano seconds" << std::endl;
res = measure_time_int( overhead_c).count();
std::cout << "int: average of " << res << " nano seconds" << std::endl;
res = measure_time_x( overhead_c).count();
std::cout << "X: 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_void( overhead_y);
std::cout << "void: average of " << res << " cpu cycles" << std::endl;
res = measure_cycles_int( overhead_y);
std::cout << "int: average of " << res << " cpu cycles" << std::endl;
res = measure_cycles_x( overhead_y);
std::cout << "X: 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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