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1 | |
2 | // Copyright Oliver Kowalke 2014. | |
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/coroutine2/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 | typedef boost::coroutines2::protected_fixedsize_stack stack_allocator; | |
21 | typedef boost::coroutines2::coroutine< void > coro_type; | |
22 | ||
23 | boost::uint64_t jobs = 1000; | |
24 | ||
25 | void fn( coro_type::pull_type & c) | |
26 | { while ( true) c(); } | |
27 | ||
28 | duration_type measure_time( duration_type overhead) | |
29 | { | |
30 | stack_allocator stack_alloc; | |
31 | ||
32 | time_point_type start( clock_type::now() ); | |
33 | for ( std::size_t i = 0; i < jobs; ++i) { | |
34 | coro_type::push_type c( stack_alloc, fn); | |
35 | } | |
36 | duration_type total = clock_type::now() - start; | |
37 | total -= overhead_clock(); // overhead of measurement | |
38 | total /= jobs; // loops | |
39 | ||
40 | return total; | |
41 | } | |
42 | ||
43 | # ifdef BOOST_CONTEXT_CYCLE | |
44 | cycle_type measure_cycles( cycle_type overhead) | |
45 | { | |
46 | stack_allocator stack_alloc; | |
47 | ||
48 | cycle_type start( cycles() ); | |
49 | for ( std::size_t i = 0; i < jobs; ++i) { | |
50 | coro_type::push_type c( stack_alloc, fn); | |
51 | } | |
52 | cycle_type total = cycles() - start; | |
53 | total -= overhead; // overhead of measurement | |
54 | total /= jobs; // loops | |
55 | ||
56 | return total; | |
57 | } | |
58 | # endif | |
59 | ||
60 | int main( int argc, char * argv[]) | |
61 | { | |
62 | try | |
63 | { | |
64 | bool bind = false; | |
65 | boost::program_options::options_description desc("allowed options"); | |
66 | desc.add_options() | |
67 | ("help", "help message") | |
68 | ("bind,b", boost::program_options::value< bool >( & bind), "bind thread to CPU") | |
69 | ("jobs,j", boost::program_options::value< boost::uint64_t >( & jobs), "jobs to run"); | |
70 | ||
71 | boost::program_options::variables_map vm; | |
72 | boost::program_options::store( | |
73 | boost::program_options::parse_command_line( | |
74 | argc, | |
75 | argv, | |
76 | desc), | |
77 | vm); | |
78 | boost::program_options::notify( vm); | |
79 | ||
80 | if ( vm.count("help") ) { | |
81 | std::cout << desc << std::endl; | |
82 | return EXIT_SUCCESS; | |
83 | } | |
84 | ||
85 | if ( bind) bind_to_processor( 0); | |
86 | ||
87 | duration_type overhead_c = overhead_clock(); | |
88 | boost::uint64_t res = measure_time( overhead_c).count(); | |
89 | std::cout << "average of " << res << " nano seconds" << std::endl; | |
90 | #ifdef BOOST_CONTEXT_CYCLE | |
91 | cycle_type overhead_y = overhead_cycle(); | |
92 | res = measure_cycles( overhead_y); | |
93 | std::cout << "average of " << res << " cpu cycles" << std::endl; | |
94 | #endif | |
95 | ||
96 | return EXIT_SUCCESS; | |
97 | } | |
98 | catch ( std::exception const& e) | |
99 | { std::cerr << "exception: " << e.what() << std::endl; } | |
100 | catch (...) | |
101 | { std::cerr << "unhandled exception" << std::endl; } | |
102 | return EXIT_FAILURE; | |
103 | } |