1
2 // Copyright Oliver Kowalke 2009.
3 // Distributed under the Boost Software License, Version 1.0.
4 // (See accompanying file LICENSE_1_0.txt or copy at
5 // http://www.boost.org/LICENSE_1_0.txt)
6
7 #include <cstdlib>
8 #include <iostream>
9 #include <stdexcept>
10
11 #include <boost/chrono.hpp>
12 #include <boost/coroutine/all.hpp>
13 #include <boost/cstdint.hpp>
14 #include <boost/program_options.hpp>
15
16 #include "../../bind_processor.hpp"
17 #include "../../clock.hpp"
18 #include "../../cycle.hpp"
19
20 boost::coroutines::flag_fpu_t preserve_fpu = boost::coroutines::fpu_not_preserved;
21 boost::coroutines::flag_unwind_t unwind_stack = boost::coroutines::stack_unwind;
22 boost::uint64_t jobs = 1000;
23
fn(boost::coroutines::symmetric_coroutine<void>::yield_type &)24 void fn( boost::coroutines::symmetric_coroutine< void >::yield_type &) {}
25
measure_time(duration_type overhead)26 duration_type measure_time( duration_type overhead)
27 {
28 time_point_type start( clock_type::now() );
29 for ( std::size_t i = 0; i < jobs; ++i) {
30 boost::coroutines::symmetric_coroutine< void >::call_type c( fn,
31 boost::coroutines::attributes( unwind_stack, preserve_fpu) );
32 }
33 duration_type total = clock_type::now() - start;
34 total -= overhead; // overhead of measurement
35 total /= jobs; // loops
36
37 return total;
38 }
39
40 # ifdef BOOST_CONTEXT_CYCLE
measure_cycles(cycle_type overhead)41 cycle_type measure_cycles( cycle_type overhead)
42 {
43 cycle_type start( cycles() );
44 for ( std::size_t i = 0; i < jobs; ++i) {
45 boost::coroutines::symmetric_coroutine< void >::call_type c( fn,
46 boost::coroutines::attributes( unwind_stack, preserve_fpu) );
47 }
48 cycle_type total = cycles() - start;
49 total -= overhead; // overhead of measurement
50 total /= jobs; // loops
51
52 return total;
53 }
54 # endif
55
main(int argc,char * argv[])56 int main( int argc, char * argv[])
57 {
58 try
59 {
60 bool preserve = false, unwind = true, bind = false;
61 boost::program_options::options_description desc("allowed options");
62 desc.add_options()
63 ("help", "help message")
64 ("bind,b", boost::program_options::value< bool >( & bind), "bind thread to CPU")
65 ("fpu,f", boost::program_options::value< bool >( & preserve), "preserve FPU registers")
66 ("unwind,u", boost::program_options::value< bool >( & unwind), "unwind coroutine-stack")
67 ("jobs,j", boost::program_options::value< boost::uint64_t >( & jobs), "jobs to run");
68
69 boost::program_options::variables_map vm;
70 boost::program_options::store(
71 boost::program_options::parse_command_line(
72 argc,
73 argv,
74 desc),
75 vm);
76 boost::program_options::notify( vm);
77
78 if ( vm.count("help") ) {
79 std::cout << desc << std::endl;
80 return EXIT_SUCCESS;
81 }
82
83 if ( preserve) preserve_fpu = boost::coroutines::fpu_preserved;
84 if ( ! unwind) unwind_stack = boost::coroutines::no_stack_unwind;
85 if ( bind) bind_to_processor( 0);
86
87 duration_type overhead_c = overhead_clock();
88 std::cout << "overhead " << overhead_c.count() << " nano seconds" << std::endl;
89 boost::uint64_t res = measure_time( overhead_c).count();
90 std::cout << "average of " << res << " nano seconds" << std::endl;
91 #ifdef BOOST_CONTEXT_CYCLE
92 cycle_type overhead_y = overhead_cycle();
93 std::cout << "overhead " << overhead_y << " cpu cycles" << std::endl;
94 res = measure_cycles( overhead_y);
95 std::cout << "average of " << res << " cpu cycles" << std::endl;
96 #endif
97
98 return EXIT_SUCCESS;
99 }
100 catch ( std::exception const& e)
101 { std::cerr << "exception: " << e.what() << std::endl; }
102 catch (...)
103 { std::cerr << "unhandled exception" << std::endl; }
104 return EXIT_FAILURE;
105 }
106