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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 <cstddef> | |
8 | #include <cstdlib> | |
9 | #include <iostream> | |
10 | #include <stdexcept> | |
11 | ||
12 | #include <windows.h> | |
13 | ||
14 | #include <boost/chrono.hpp> | |
15 | #include <boost/cstdint.hpp> | |
16 | #include <boost/program_options.hpp> | |
17 | ||
18 | #include "../bind_processor.hpp" | |
19 | #include "../clock.hpp" | |
20 | #include "../cycle.hpp" | |
21 | #include "../../example/simple_stack_allocator.hpp" | |
22 | ||
23 | typedef boost::context::simple_stack_allocator< | |
24 | 8 * 1024 * 1024, 64 * 1024, 8 * 1024 | |
25 | > stack_allocator; | |
26 | ||
27 | boost::uint64_t jobs = 1000; | |
28 | LPVOID fc, fm; | |
29 | ||
30 | VOID __stdcall fn( LPVOID) | |
31 | { while ( true) ::SwitchToFiber( fm); } | |
32 | ||
33 | duration_type measure_time() | |
34 | { | |
35 | // cache warum-up | |
36 | ::SwitchToFiber( fc); | |
37 | ||
38 | time_point_type start( clock_type::now() ); | |
39 | for ( std::size_t i = 0; i < jobs; ++i) { | |
40 | ::SwitchToFiber( fc); | |
41 | } | |
42 | duration_type total = clock_type::now() - start; | |
43 | total -= overhead_clock(); // overhead of measurement | |
44 | total /= jobs; // loops | |
45 | total /= 2; // 2x jump_fcontext | |
46 | ||
47 | return total; | |
48 | } | |
49 | ||
50 | #ifdef BOOST_CONTEXT_CYCLE | |
51 | cycle_type measure_cycles() | |
52 | { | |
53 | // cache warum-up | |
54 | ::SwitchToFiber( fc); | |
55 | ||
56 | cycle_type start( cycles() ); | |
57 | for ( std::size_t i = 0; i < jobs; ++i) { | |
58 | ::SwitchToFiber( fc); | |
59 | } | |
60 | cycle_type total = cycles() - start; | |
61 | total -= overhead_cycle(); // overhead of measurement | |
62 | total /= jobs; // loops | |
63 | total /= 2; // 2x jump_fcontext | |
64 | ||
65 | return total; | |
66 | } | |
67 | #endif | |
68 | ||
69 | int main( int argc, char * argv[]) | |
70 | { | |
71 | try | |
72 | { | |
73 | bind_to_processor( 0); | |
74 | ||
75 | boost::program_options::options_description desc("allowed options"); | |
76 | desc.add_options() | |
77 | ("help", "help message") | |
78 | ("jobs,j", boost::program_options::value< boost::uint64_t >( & jobs), "jobs to run"); | |
79 | ||
80 | boost::program_options::variables_map vm; | |
81 | boost::program_options::store( | |
82 | boost::program_options::parse_command_line( | |
83 | argc, | |
84 | argv, | |
85 | desc), | |
86 | vm); | |
87 | boost::program_options::notify( vm); | |
88 | ||
89 | if ( vm.count("help") ) { | |
90 | std::cout << desc << std::endl; | |
91 | return EXIT_SUCCESS; | |
92 | } | |
93 | ||
94 | fm = ::ConvertThreadToFiber( 0); | |
95 | fc = ::CreateFiber( stack_allocator::default_stacksize(), fn, 0); | |
96 | ||
97 | boost::uint64_t res = measure_time().count(); | |
98 | std::cout << "average of " << res << " nano seconds" << std::endl; | |
99 | #ifdef BOOST_CONTEXT_CYCLE | |
100 | res = measure_cycles(); | |
101 | std::cout << "average of " << res << " cpu cycles" << std::endl; | |
102 | #endif | |
103 | ||
104 | return EXIT_SUCCESS; | |
105 | } | |
106 | catch ( std::exception const& e) | |
107 | { std::cerr << "exception: " << e.what() << std::endl; } | |
108 | catch (...) | |
109 | { std::cerr << "unhandled exception" << std::endl; } | |
110 | return EXIT_FAILURE; | |
111 | } |