1 | #pragma once |
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2 | #define LIST_VARIANT work_stealing |
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3 | |
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4 | #include <cmath> |
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5 | #include <iomanip> |
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6 | #include <memory> |
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7 | #include <mutex> |
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8 | #include <thread> |
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9 | #include <type_traits> |
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10 | |
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11 | #include "assert.hpp" |
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12 | #include "utils.hpp" |
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13 | #include "links.hpp" |
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14 | #include "links2.hpp" |
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15 | #include "snzi.hpp" |
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16 | |
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17 | // #include <x86intrin.h> |
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18 | |
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19 | using namespace std; |
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20 | |
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21 | static const long long lim = 2000; |
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22 | static const unsigned nqueues = 2; |
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23 | |
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24 | struct __attribute__((aligned(128))) timestamp_t { |
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25 | volatile unsigned long long val = 0; |
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26 | }; |
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27 | |
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28 | template<typename node_t> |
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29 | struct __attribute__((aligned(128))) localQ_t { |
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30 | // volatile unsigned long long val = 0; |
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31 | // mpsc_queue<node_t> queue = {}; |
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32 | // spinlock_t lock = {}; |
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33 | intrusive_queue_t<node_t> list; |
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34 | |
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35 | inline auto ts() { return list.ts(); } |
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36 | inline auto lock() { return list.lock.lock(); } |
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37 | inline auto try_lock() { return list.lock.try_lock(); } |
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38 | inline auto unlock() { return list.lock.unlock(); } |
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39 | |
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40 | inline auto push( node_t * node ) { return list.push( node ); } |
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41 | inline auto pop() { return list.pop(); } |
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42 | }; |
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43 | |
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44 | template<typename node_t> |
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45 | class __attribute__((aligned(128))) work_stealing { |
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46 | static_assert(std::is_same<decltype(node_t::_links), _LinksFields_t<node_t>>::value, "Node must have a links field"); |
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47 | |
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48 | public: |
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49 | static const char * name() { |
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50 | return "Work Stealing"; |
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51 | } |
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52 | |
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53 | work_stealing(unsigned _numThreads, unsigned) |
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54 | : numThreads(_numThreads * nqueues) |
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55 | , lists(new localQ_t<node_t>[numThreads]) |
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56 | // , lists(new intrusive_queue_t<node_t>[numThreads]) |
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57 | , times(new timestamp_t[numThreads]) |
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58 | // , snzi( std::log2( numThreads / 2 ), 2 ) |
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59 | |
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60 | { |
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61 | std::cout << "Constructing Work Stealer with " << numThreads << std::endl; |
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62 | } |
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63 | |
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64 | ~work_stealing() { |
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65 | std::cout << "Destroying Work Stealer" << std::endl; |
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66 | lists.reset(); |
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67 | } |
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68 | |
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69 | __attribute__((noinline, hot)) void push(node_t * node) { |
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70 | node->_links.ts = rdtscl(); |
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71 | // node->_links.ts = 1; |
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72 | |
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73 | auto & list = *({ |
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74 | unsigned i; |
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75 | do { |
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76 | tls.stats.push.attempt++; |
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77 | // unsigned r = tls.rng1.next(); |
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78 | unsigned r = tls.it++; |
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79 | if(tls.my_queue == outside) { |
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80 | i = r % numThreads; |
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81 | } else { |
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82 | i = tls.my_queue + (r % nqueues); |
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83 | } |
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84 | } while(!lists[i].try_lock()); |
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85 | &lists[i]; |
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86 | }); |
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87 | |
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88 | list.push( node ); |
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89 | list.unlock(); |
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90 | // tls.rng2.set_raw_state( tls.rng1.get_raw_state()); |
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91 | // count++; |
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92 | tls.stats.push.success++; |
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93 | } |
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94 | |
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95 | __attribute__((noinline, hot)) node_t * pop() { |
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96 | if(tls.my_queue != outside) { |
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97 | if( tls.myfriend == outside ) { |
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98 | auto r = tls.rng1.next(); |
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99 | tls.myfriend = r % numThreads; |
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100 | tls.mytime = lists[(tls.it % nqueues) + tls.my_queue].ts(); |
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101 | // times[tls.myfriend].val = 0; |
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102 | // lists[tls.myfriend].val = 0; |
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103 | } |
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104 | // else if(times[tls.myfriend].val == 0) { |
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105 | // else if(lists[tls.myfriend].val == 0) { |
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106 | else if(times[tls.myfriend].val < tls.mytime) { |
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107 | // else if(times[tls.myfriend].val < lists[(tls.it % nqueues) + tls.my_queue].ts()) { |
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108 | node_t * n = try_pop(tls.myfriend, tls.stats.pop.help); |
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109 | tls.stats.help++; |
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110 | tls.myfriend = outside; |
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111 | if(n) return n; |
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112 | } |
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113 | // if( tls.myfriend == outside ) { |
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114 | // auto r = tls.rng1.next(); |
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115 | // tls.myfriend = r % numThreads; |
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116 | // tls.mytime = lists[((tls.it + 1) % nqueues) + tls.my_queue].ts(); |
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117 | // } |
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118 | // else { |
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119 | // if(times[tls.myfriend].val + 1000 < tls.mytime) { |
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120 | // node_t * n = try_pop(tls.myfriend, tls.stats.pop.help); |
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121 | // tls.stats.help++; |
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122 | // if(n) return n; |
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123 | // } |
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124 | // tls.myfriend = outside; |
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125 | // } |
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126 | |
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127 | node_t * n = local(); |
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128 | if(n) return n; |
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129 | } |
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130 | |
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131 | // try steal |
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132 | for(int i = 0; i < 25; i++) { |
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133 | node_t * n = steal(); |
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134 | if(n) return n; |
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135 | } |
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136 | |
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137 | return search(); |
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138 | } |
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139 | |
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140 | private: |
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141 | inline node_t * local() { |
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142 | unsigned i = (--tls.it % nqueues) + tls.my_queue; |
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143 | return try_pop(i, tls.stats.pop.local); |
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144 | } |
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145 | |
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146 | inline node_t * steal() { |
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147 | unsigned i = tls.rng2.prev() % numThreads; |
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148 | return try_pop(i, tls.stats.pop.steal); |
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149 | } |
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150 | |
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151 | inline node_t * search() { |
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152 | unsigned offset = tls.rng2.prev(); |
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153 | for(unsigned i = 0; i < numThreads; i++) { |
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154 | unsigned idx = (offset + i) % numThreads; |
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155 | node_t * thrd = try_pop(idx, tls.stats.pop.search); |
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156 | if(thrd) { |
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157 | return thrd; |
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158 | } |
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159 | } |
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160 | |
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161 | return nullptr; |
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162 | } |
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163 | |
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164 | private: |
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165 | struct attempt_stat_t { |
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166 | std::size_t attempt = { 0 }; |
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167 | std::size_t elock = { 0 }; |
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168 | std::size_t eempty = { 0 }; |
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169 | std::size_t espec = { 0 }; |
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170 | std::size_t success = { 0 }; |
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171 | }; |
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172 | |
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173 | node_t * try_pop(unsigned i, attempt_stat_t & stat) { |
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174 | assert(i < numThreads); |
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175 | auto & list = lists[i]; |
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176 | stat.attempt++; |
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177 | |
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178 | // If the list is empty, don't try |
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179 | if(list.ts() == 0) { stat.espec++; return nullptr; } |
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180 | |
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181 | // If we can't get the lock, move on |
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182 | if( !list.try_lock() ) { stat.elock++; return nullptr; } |
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183 | |
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184 | // If list is empty, unlock and retry |
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185 | if( list.ts() == 0 ) { |
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186 | list.unlock(); |
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187 | stat.eempty++; |
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188 | return nullptr; |
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189 | } |
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190 | |
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191 | auto node = list.pop(); |
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192 | list.unlock(); |
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193 | stat.success++; |
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194 | // times[i].val = 1; |
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195 | times[i].val = node.first->_links.ts; |
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196 | // lists[i].val = node.first->_links.ts; |
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197 | return node.first; |
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198 | } |
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199 | |
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200 | |
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201 | public: |
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202 | |
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203 | static std::atomic_uint32_t ticket; |
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204 | static const unsigned outside = 0xFFFFFFFF; |
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205 | |
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206 | static inline unsigned calc_preferred() { |
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207 | unsigned t = ticket++; |
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208 | if(t == 0) return outside; |
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209 | unsigned i = (t - 1) * nqueues; |
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210 | return i; |
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211 | } |
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212 | |
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213 | static __attribute__((aligned(128))) thread_local struct TLS { |
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214 | Random rng1 = { unsigned(std::hash<std::thread::id>{}(std::this_thread::get_id()) ^ rdtscl()) }; |
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215 | Random rng2 = { unsigned(std::hash<std::thread::id>{}(std::this_thread::get_id()) ^ rdtscl()) }; |
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216 | unsigned it = 0; |
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217 | unsigned my_queue = calc_preferred(); |
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218 | unsigned myfriend = outside; |
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219 | unsigned long long int mytime = 0; |
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220 | #if defined(READ) |
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221 | unsigned it = 0; |
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222 | #endif |
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223 | struct { |
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224 | struct { |
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225 | std::size_t attempt = { 0 }; |
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226 | std::size_t success = { 0 }; |
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227 | } push; |
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228 | struct { |
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229 | attempt_stat_t help; |
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230 | attempt_stat_t local; |
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231 | attempt_stat_t steal; |
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232 | attempt_stat_t search; |
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233 | } pop; |
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234 | std::size_t help = { 0 }; |
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235 | } stats; |
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236 | } tls; |
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237 | |
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238 | private: |
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239 | const unsigned numThreads; |
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240 | std::unique_ptr<localQ_t<node_t> []> lists; |
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241 | // std::unique_ptr<intrusive_queue_t<node_t> []> lists; |
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242 | std::unique_ptr<timestamp_t []> times; |
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243 | __attribute__((aligned(128))) std::atomic_size_t count; |
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244 | |
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245 | #ifndef NO_STATS |
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246 | private: |
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247 | static struct GlobalStats { |
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248 | struct { |
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249 | std::atomic_size_t attempt = { 0 }; |
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250 | std::atomic_size_t success = { 0 }; |
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251 | } push; |
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252 | struct { |
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253 | struct { |
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254 | std::atomic_size_t attempt = { 0 }; |
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255 | std::atomic_size_t elock = { 0 }; |
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256 | std::atomic_size_t eempty = { 0 }; |
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257 | std::atomic_size_t espec = { 0 }; |
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258 | std::atomic_size_t success = { 0 }; |
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259 | } help; |
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260 | struct { |
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261 | std::atomic_size_t attempt = { 0 }; |
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262 | std::atomic_size_t elock = { 0 }; |
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263 | std::atomic_size_t eempty = { 0 }; |
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264 | std::atomic_size_t espec = { 0 }; |
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265 | std::atomic_size_t success = { 0 }; |
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266 | } local; |
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267 | struct { |
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268 | std::atomic_size_t attempt = { 0 }; |
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269 | std::atomic_size_t elock = { 0 }; |
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270 | std::atomic_size_t eempty = { 0 }; |
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271 | std::atomic_size_t espec = { 0 }; |
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272 | std::atomic_size_t success = { 0 }; |
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273 | } steal; |
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274 | struct { |
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275 | std::atomic_size_t attempt = { 0 }; |
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276 | std::atomic_size_t elock = { 0 }; |
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277 | std::atomic_size_t eempty = { 0 }; |
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278 | std::atomic_size_t espec = { 0 }; |
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279 | std::atomic_size_t success = { 0 }; |
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280 | } search; |
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281 | } pop; |
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282 | std::atomic_size_t help = { 0 }; |
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283 | } global_stats; |
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284 | |
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285 | public: |
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286 | static void stats_tls_tally() { |
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287 | global_stats.push.attempt += tls.stats.push.attempt; |
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288 | global_stats.push.success += tls.stats.push.success; |
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289 | global_stats.pop.help .attempt += tls.stats.pop.help .attempt; |
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290 | global_stats.pop.help .elock += tls.stats.pop.help .elock ; |
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291 | global_stats.pop.help .eempty += tls.stats.pop.help .eempty ; |
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292 | global_stats.pop.help .espec += tls.stats.pop.help .espec ; |
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293 | global_stats.pop.help .success += tls.stats.pop.help .success; |
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294 | global_stats.pop.local .attempt += tls.stats.pop.local .attempt; |
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295 | global_stats.pop.local .elock += tls.stats.pop.local .elock ; |
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296 | global_stats.pop.local .eempty += tls.stats.pop.local .eempty ; |
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297 | global_stats.pop.local .espec += tls.stats.pop.local .espec ; |
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298 | global_stats.pop.local .success += tls.stats.pop.local .success; |
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299 | global_stats.pop.steal .attempt += tls.stats.pop.steal .attempt; |
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300 | global_stats.pop.steal .elock += tls.stats.pop.steal .elock ; |
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301 | global_stats.pop.steal .eempty += tls.stats.pop.steal .eempty ; |
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302 | global_stats.pop.steal .espec += tls.stats.pop.steal .espec ; |
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303 | global_stats.pop.steal .success += tls.stats.pop.steal .success; |
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304 | global_stats.pop.search.attempt += tls.stats.pop.search.attempt; |
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305 | global_stats.pop.search.elock += tls.stats.pop.search.elock ; |
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306 | global_stats.pop.search.eempty += tls.stats.pop.search.eempty ; |
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307 | global_stats.pop.search.espec += tls.stats.pop.search.espec ; |
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308 | global_stats.pop.search.success += tls.stats.pop.search.success; |
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309 | global_stats.help += tls.stats.help; |
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310 | } |
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311 | |
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312 | static void stats_print(std::ostream & os, double duration ) { |
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313 | std::cout << "----- Work Stealing Stats -----" << std::endl; |
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314 | |
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315 | double push_suc = (100.0 * double(global_stats.push.success) / global_stats.push.attempt); |
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316 | double push_len = double(global_stats.push.attempt ) / global_stats.push.success; |
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317 | os << "Push Pick : " << push_suc << " %, len " << push_len << " (" << global_stats.push.attempt << " / " << global_stats.push.success << ")\n"; |
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318 | |
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319 | double hlp_suc = (100.0 * double(global_stats.pop.help.success) / global_stats.pop.help.attempt); |
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320 | double hlp_len = double(global_stats.pop.help.attempt ) / global_stats.pop.help.success; |
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321 | os << "Help : " << hlp_suc << " %, len " << hlp_len << " (" << global_stats.pop.help.attempt << " / " << global_stats.pop.help.success << ")\n"; |
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322 | os << "Help Fail : " << global_stats.pop.help.espec << "s, " << global_stats.pop.help.eempty << "e, " << global_stats.pop.help.elock << "l\n"; |
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323 | |
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324 | double pop_suc = (100.0 * double(global_stats.pop.local.success) / global_stats.pop.local.attempt); |
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325 | double pop_len = double(global_stats.pop.local.attempt ) / global_stats.pop.local.success; |
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326 | os << "Local : " << pop_suc << " %, len " << pop_len << " (" << global_stats.pop.local.attempt << " / " << global_stats.pop.local.success << ")\n"; |
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327 | os << "Local Fail : " << global_stats.pop.local.espec << "s, " << global_stats.pop.local.eempty << "e, " << global_stats.pop.local.elock << "l\n"; |
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328 | |
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329 | double stl_suc = (100.0 * double(global_stats.pop.steal.success) / global_stats.pop.steal.attempt); |
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330 | double stl_len = double(global_stats.pop.steal.attempt ) / global_stats.pop.steal.success; |
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331 | os << "Steal : " << stl_suc << " %, len " << stl_len << " (" << global_stats.pop.steal.attempt << " / " << global_stats.pop.steal.success << ")\n"; |
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332 | os << "Steal Fail : " << global_stats.pop.steal.espec << "s, " << global_stats.pop.steal.eempty << "e, " << global_stats.pop.steal.elock << "l\n"; |
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333 | |
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334 | double srh_suc = (100.0 * double(global_stats.pop.search.success) / global_stats.pop.search.attempt); |
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335 | double srh_len = double(global_stats.pop.search.attempt ) / global_stats.pop.search.success; |
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336 | os << "Search : " << srh_suc << " %, len " << srh_len << " (" << global_stats.pop.search.attempt << " / " << global_stats.pop.search.success << ")\n"; |
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337 | os << "Search Fail : " << global_stats.pop.search.espec << "s, " << global_stats.pop.search.eempty << "e, " << global_stats.pop.search.elock << "l\n"; |
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338 | os << "Helps : " << std::setw(15) << std::scientific << global_stats.help / duration << "/sec (" << global_stats.help << ")\n"; |
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339 | } |
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340 | private: |
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341 | #endif |
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342 | }; |
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