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1 | |
2 | // Copyright Oliver Kowalke 2015. | |
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 | // based on https://github.com/atemerev/skynet from Alexander Temerev | |
8 | ||
9 | #include <algorithm> | |
10 | #include <cassert> | |
11 | #include <chrono> | |
12 | #include <cmath> | |
13 | #include <cstddef> | |
14 | #include <cstdint> | |
15 | #include <cstdlib> | |
16 | #include <iostream> | |
17 | #include <memory> | |
18 | #include <numeric> | |
19 | #include <vector> | |
20 | ||
21 | #include <boost/fiber/all.hpp> | |
22 | #include <boost/predef.h> | |
23 | ||
24 | using allocator_type = boost::fibers::fixedsize_stack; | |
25 | using channel_type = boost::fibers::buffered_channel< std::uint64_t >; | |
26 | using clock_type = std::chrono::steady_clock; | |
27 | using duration_type = clock_type::duration; | |
28 | using time_point_type = clock_type::time_point; | |
29 | ||
30 | // microbenchmark | |
31 | void skynet( allocator_type & salloc, channel_type & c, std::size_t num, std::size_t size, std::size_t div) { | |
32 | if ( 1 == size) { | |
33 | c.push( num); | |
34 | } else { | |
35 | channel_type rc{ 16 }; | |
36 | std::vector< boost::fibers::fiber > fibers; | |
37 | for ( std::size_t i = 0; i < div; ++i) { | |
38 | auto sub_num = num + i * size / div; | |
39 | fibers.emplace_back( boost::fibers::launch::dispatch, | |
40 | std::allocator_arg, salloc, | |
41 | skynet, | |
42 | std::ref( salloc), std::ref( rc), sub_num, size / div, div); | |
43 | } | |
44 | for ( auto & f: fibers) { | |
45 | f.join(); | |
46 | } | |
47 | std::uint64_t sum{ 0 }; | |
48 | for ( std::size_t i = 0; i < div; ++i) { | |
49 | sum += rc.value_pop(); | |
50 | } | |
51 | c.push( sum); | |
52 | } | |
53 | } | |
54 | ||
55 | int main() { | |
56 | try { | |
57 | std::size_t size{ 1000000 }; | |
58 | std::size_t div{ 10 }; | |
59 | // Windows 10 and FreeBSD require a fiber stack of 8kb | |
60 | // otherwise the stack gets exhausted | |
61 | // stack requirements must be checked for other OS too | |
62 | #if BOOST_OS_WINDOWS || BOOST_OS_BSD | |
63 | allocator_type salloc{ 2*allocator_type::traits_type::page_size() }; | |
64 | #else | |
65 | allocator_type salloc{ allocator_type::traits_type::page_size() }; | |
66 | #endif | |
67 | std::uint64_t result{ 0 }; | |
68 | channel_type rc{ 2 }; | |
69 | time_point_type start{ clock_type::now() }; | |
70 | skynet( salloc, rc, 0, size, div); | |
71 | result = rc.value_pop(); | |
72 | if ( 499999500000 != result) { | |
73 | throw std::runtime_error("invalid result"); | |
74 | } | |
75 | auto duration = clock_type::now() - start; | |
76 | std::cout << "duration: " << duration.count() / 1000000 << " ms" << std::endl; | |
77 | return EXIT_SUCCESS; | |
78 | } catch ( std::exception const& e) { | |
79 | std::cerr << "exception: " << e.what() << std::endl; | |
80 | } catch (...) { | |
81 | std::cerr << "unhandled exception" << std::endl; | |
82 | } | |
83 | return EXIT_FAILURE; | |
84 | } |