1 | #pragma once |
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2 | #define LIST_VARIANT relaxed_list |
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3 | |
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4 | #define VANILLA 0 |
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5 | #define SNZI 1 |
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6 | #define BITMASK 2 |
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7 | #define DISCOVER 3 |
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8 | #define SNZM 4 |
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9 | #define BIAS 5 |
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10 | #define BACK 6 |
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11 | #define BACKBIAS 7 |
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12 | |
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13 | #ifndef VARIANT |
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14 | #define VARIANT VANILLA |
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15 | #endif |
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16 | |
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17 | #ifndef NO_STATS |
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18 | #include <iostream> |
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19 | #endif |
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20 | |
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21 | #include <cmath> |
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22 | #include <functional> |
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23 | #include <memory> |
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24 | #include <mutex> |
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25 | #include <thread> |
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26 | #include <type_traits> |
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27 | |
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28 | #include "assert.hpp" |
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29 | #include "utils.hpp" |
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30 | #include "links.hpp" |
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31 | #include "snzi.hpp" |
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32 | #include "snzm.hpp" |
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33 | |
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34 | using namespace std; |
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35 | |
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36 | struct pick_stat { |
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37 | struct { |
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38 | size_t attempt = 0; |
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39 | size_t success = 0; |
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40 | size_t local = 0; |
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41 | } push; |
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42 | struct { |
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43 | size_t attempt = 0; |
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44 | size_t success = 0; |
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45 | size_t mask_attempt = 0; |
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46 | size_t mask_reset = 0; |
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47 | size_t local = 0; |
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48 | } pop; |
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49 | }; |
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50 | |
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51 | struct empty_stat { |
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52 | struct { |
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53 | size_t value = 0; |
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54 | size_t count = 0; |
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55 | } push; |
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56 | struct { |
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57 | size_t value = 0; |
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58 | size_t count = 0; |
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59 | } pop; |
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60 | }; |
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61 | |
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62 | template<typename node_t> |
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63 | class __attribute__((aligned(128))) relaxed_list { |
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64 | static_assert(std::is_same<decltype(node_t::_links), _LinksFields_t<node_t>>::value, "Node must have a links field"); |
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65 | |
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66 | public: |
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67 | static const char * name() { |
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68 | const char * names[] = { |
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69 | "RELAXED: VANILLA", |
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70 | "RELAXED: SNZI", |
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71 | "RELAXED: BITMASK", |
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72 | "RELAXED: SNZI + DISCOVERED MASK", |
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73 | "RELAXED: SNZI + MASK", |
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74 | "RELAXED: SNZI + LOCAL BIAS", |
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75 | "RELAXED: SNZI + REVERSE RNG", |
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76 | "RELAXED: SNZI + LOCAL BIAS + REVERSE RNG" |
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77 | }; |
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78 | return names[VARIANT]; |
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79 | } |
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80 | |
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81 | relaxed_list(unsigned numThreads, unsigned numQueues) |
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82 | : numLists(numThreads * numQueues) |
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83 | , lists(new intrusive_queue_t<node_t>[numLists]) |
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84 | #if VARIANT == SNZI || VARIANT == BIAS || VARIANT == BACK || VARIANT == BACKBIAS |
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85 | , snzi( std::log2( numLists / (numQueues) ), 2 ) |
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86 | #elif VARIANT == SNZM || VARIANT == DISCOVER |
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87 | , snzm( numLists ) |
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88 | #endif |
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89 | { |
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90 | assertf(7 * 8 * 8 >= numLists, "List currently only supports 448 sublists"); |
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91 | std::cout << "Constructing Relaxed List with " << numLists << std::endl; |
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92 | } |
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93 | |
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94 | ~relaxed_list() { |
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95 | std::cout << "Destroying Relaxed List" << std::endl; |
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96 | lists.reset(); |
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97 | } |
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98 | |
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99 | __attribute__((noinline, hot)) void push(node_t * node) { |
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100 | node->_links.ts = rdtscl(); |
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101 | |
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102 | while(true) { |
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103 | // Pick a random list |
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104 | unsigned i = idx_from_r(tls.rng1.next(), VARIANT == BIAS || VARIANT == BACKBIAS); |
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105 | |
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106 | #ifndef NO_STATS |
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107 | tls.pick.push.attempt++; |
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108 | #endif |
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109 | |
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110 | // If we can't lock it retry |
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111 | if( !lists[i].lock.try_lock() ) continue; |
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112 | |
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113 | #if VARIANT == VANILLA || VARIANT == BITMASK |
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114 | __attribute__((unused)) int num = numNonEmpty; |
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115 | #endif |
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116 | |
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117 | // Actually push it |
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118 | if(lists[i].push(node)) { |
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119 | #if VARIANT == DISCOVER |
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120 | size_t qword = i >> 6ull; |
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121 | size_t bit = i & 63ull; |
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122 | assert(qword == 0); |
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123 | bts(tls.mask, bit); |
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124 | snzm.arrive(i); |
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125 | #elif VARIANT == SNZI || VARIANT == BIAS |
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126 | snzi.arrive(i); |
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127 | #elif VARIANT == BACK || VARIANT == BACKBIAS |
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128 | snzi.arrive(i); |
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129 | tls.rng2.set_raw_state( tls.rng1.get_raw_state()); |
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130 | #elif VARIANT == SNZM |
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131 | snzm.arrive(i); |
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132 | #elif VARIANT == BITMASK |
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133 | numNonEmpty++; |
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134 | size_t qword = i >> 6ull; |
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135 | size_t bit = i & 63ull; |
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136 | assertf((list_mask[qword] & (1ul << bit)) == 0, "Before set %zu:%zu (%u), %zx & %zx", qword, bit, i, list_mask[qword].load(), (1ul << bit)); |
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137 | __attribute__((unused)) bool ret = bts(list_mask[qword], bit); |
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138 | assert(!ret); |
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139 | assertf((list_mask[qword] & (1ul << bit)) != 0, "After set %zu:%zu (%u), %zx & %zx", qword, bit, i, list_mask[qword].load(), (1ul << bit)); |
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140 | #else |
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141 | numNonEmpty++; |
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142 | #endif |
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143 | } |
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144 | #if VARIANT == VANILLA || VARIANT == BITMASK |
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145 | assert(numNonEmpty <= (int)numLists); |
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146 | #endif |
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147 | |
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148 | // Unlock and return |
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149 | lists[i].lock.unlock(); |
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150 | |
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151 | #ifndef NO_STATS |
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152 | tls.pick.push.success++; |
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153 | #if VARIANT == VANILLA || VARIANT == BITMASK |
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154 | tls.empty.push.value += num; |
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155 | tls.empty.push.count += 1; |
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156 | #endif |
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157 | #endif |
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158 | return; |
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159 | } |
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160 | } |
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161 | |
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162 | __attribute__((noinline, hot)) node_t * pop() { |
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163 | #if VARIANT == DISCOVER |
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164 | assert(numLists <= 64); |
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165 | while(snzm.query()) { |
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166 | tls.pick.pop.mask_attempt++; |
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167 | unsigned i, j; |
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168 | { |
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169 | // Pick first list totally randomly |
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170 | i = tls.rng1.next() % numLists; |
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171 | |
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172 | // Pick the other according to the bitmask |
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173 | unsigned r = tls.rng1.next(); |
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174 | |
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175 | size_t mask = tls.mask.load(std::memory_order_relaxed); |
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176 | if(mask == 0) { |
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177 | tls.pick.pop.mask_reset++; |
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178 | mask = (1U << numLists) - 1; |
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179 | tls.mask.store(mask, std::memory_order_relaxed); |
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180 | } |
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181 | |
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182 | unsigned b = rand_bit(r, mask); |
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183 | |
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184 | assertf(b < 64, "%zu %u", mask, b); |
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185 | |
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186 | j = b; |
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187 | |
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188 | assert(j < numLists); |
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189 | } |
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190 | |
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191 | if(auto node = try_pop(i, j)) return node; |
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192 | } |
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193 | #elif VARIANT == SNZI |
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194 | while(snzi.query()) { |
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195 | // Pick two lists at random |
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196 | int i = tls.rng1.next() % numLists; |
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197 | int j = tls.rng1.next() % numLists; |
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198 | |
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199 | if(auto node = try_pop(i, j)) return node; |
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200 | } |
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201 | |
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202 | #elif VARIANT == BACK |
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203 | while(snzi.query()) { |
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204 | // Pick two lists at random |
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205 | int i = tls.rng2.prev() % numLists; |
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206 | int j = tls.rng2.prev() % numLists; |
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207 | |
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208 | if(auto node = try_pop(i, j)) return node; |
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209 | } |
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210 | |
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211 | #elif VARIANT == BACKBIAS |
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212 | while(snzi.query()) { |
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213 | // Pick two lists at random |
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214 | int i = idx_from_r(tls.rng2.prev(), true); |
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215 | int j = idx_from_r(tls.rng2.prev(), true); |
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216 | |
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217 | if(auto node = try_pop(i, j)) return node; |
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218 | } |
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219 | |
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220 | #elif VARIANT == BIAS |
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221 | while(snzi.query()) { |
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222 | // Pick two lists at random |
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223 | unsigned ri = tls.rng1.next(); |
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224 | unsigned i; |
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225 | unsigned j = tls.rng1.next(); |
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226 | if(0 == (ri & 0xF)) { |
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227 | i = (ri >> 4) % numLists; |
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228 | } else { |
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229 | i = tls.my_queue + ((ri >> 4) % 4); |
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230 | j = tls.my_queue + ((j >> 4) % 4); |
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231 | tls.pick.pop.local++; |
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232 | } |
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233 | i %= numLists; |
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234 | j %= numLists; |
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235 | |
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236 | if(auto node = try_pop(i, j)) return node; |
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237 | } |
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238 | #elif VARIANT == SNZM |
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239 | //* |
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240 | while(snzm.query()) { |
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241 | tls.pick.pop.mask_attempt++; |
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242 | unsigned i, j; |
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243 | { |
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244 | // Pick two random number |
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245 | unsigned ri = tls.rng1.next(); |
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246 | unsigned rj = tls.rng1.next(); |
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247 | |
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248 | // Pick two nodes from it |
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249 | unsigned wdxi = ri & snzm.mask; |
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250 | // unsigned wdxj = rj & snzm.mask; |
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251 | |
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252 | // Get the masks from the nodes |
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253 | // size_t maski = snzm.masks(wdxi); |
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254 | size_t maskj = snzm.masks(wdxj); |
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255 | |
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256 | if(maski == 0 && maskj == 0) continue; |
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257 | |
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258 | #if defined(__BMI2__) |
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259 | uint64_t idxsi = _pext_u64(snzm.indexes, maski); |
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260 | // uint64_t idxsj = _pext_u64(snzm.indexes, maskj); |
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261 | |
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262 | auto pi = __builtin_popcountll(maski); |
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263 | // auto pj = __builtin_popcountll(maskj); |
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264 | |
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265 | ri = pi ? ri & ((pi >> 3) - 1) : 0; |
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266 | rj = pj ? rj & ((pj >> 3) - 1) : 0; |
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267 | |
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268 | unsigned bi = (idxsi >> (ri << 3)) & 0xff; |
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269 | unsigned bj = (idxsj >> (rj << 3)) & 0xff; |
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270 | #else |
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271 | unsigned bi = rand_bit(ri >> snzm.depth, maski); |
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272 | unsigned bj = rand_bit(rj >> snzm.depth, maskj); |
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273 | #endif |
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274 | |
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275 | i = (bi << snzm.depth) | wdxi; |
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276 | j = (bj << snzm.depth) | wdxj; |
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277 | |
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278 | /* paranoid */ assertf(i < numLists, "%u %u", bj, wdxi); |
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279 | /* paranoid */ assertf(j < numLists, "%u %u", bj, wdxj); |
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280 | } |
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281 | |
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282 | if(auto node = try_pop(i, j)) return node; |
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283 | } |
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284 | /*/ |
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285 | while(snzm.query()) { |
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286 | // Pick two lists at random |
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287 | int i = tls.rng1.next() % numLists; |
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288 | int j = tls.rng1.next() % numLists; |
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289 | |
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290 | if(auto node = try_pop(i, j)) return node; |
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291 | } |
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292 | //*/ |
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293 | #elif VARIANT == BITMASK |
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294 | int nnempty; |
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295 | while(0 != (nnempty = numNonEmpty)) { |
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296 | tls.pick.pop.mask_attempt++; |
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297 | unsigned i, j; |
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298 | { |
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299 | // Pick two lists at random |
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300 | unsigned num = ((numLists - 1) >> 6) + 1; |
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301 | |
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302 | unsigned ri = tls.rng1.next(); |
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303 | unsigned rj = tls.rng1.next(); |
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304 | |
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305 | unsigned wdxi = (ri >> 6u) % num; |
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306 | unsigned wdxj = (rj >> 6u) % num; |
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307 | |
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308 | size_t maski = list_mask[wdxi].load(std::memory_order_relaxed); |
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309 | size_t maskj = list_mask[wdxj].load(std::memory_order_relaxed); |
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310 | |
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311 | if(maski == 0 && maskj == 0) continue; |
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312 | |
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313 | unsigned bi = rand_bit(ri, maski); |
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314 | unsigned bj = rand_bit(rj, maskj); |
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315 | |
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316 | assertf(bi < 64, "%zu %u", maski, bi); |
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317 | assertf(bj < 64, "%zu %u", maskj, bj); |
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318 | |
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319 | i = bi | (wdxi << 6); |
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320 | j = bj | (wdxj << 6); |
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321 | |
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322 | assertf(i < numLists, "%u", wdxi << 6); |
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323 | assertf(j < numLists, "%u", wdxj << 6); |
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324 | } |
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325 | |
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326 | if(auto node = try_pop(i, j)) return node; |
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327 | } |
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328 | #else |
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329 | while(numNonEmpty != 0) { |
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330 | // Pick two lists at random |
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331 | int i = tls.rng1.next() % numLists; |
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332 | int j = tls.rng1.next() % numLists; |
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333 | |
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334 | if(auto node = try_pop(i, j)) return node; |
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335 | } |
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336 | #endif |
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337 | |
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338 | return nullptr; |
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339 | } |
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340 | |
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341 | private: |
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342 | node_t * try_pop(unsigned i, unsigned j) { |
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343 | #ifndef NO_STATS |
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344 | tls.pick.pop.attempt++; |
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345 | #endif |
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346 | |
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347 | #if VARIANT == DISCOVER |
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348 | if(lists[i].ts() > 0) bts(tls.mask, i); else btr(tls.mask, i); |
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349 | if(lists[j].ts() > 0) bts(tls.mask, j); else btr(tls.mask, j); |
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350 | #endif |
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351 | |
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352 | // Pick the bet list |
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353 | int w = i; |
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354 | if( __builtin_expect(lists[j].ts() != 0, true) ) { |
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355 | w = (lists[i].ts() < lists[j].ts()) ? i : j; |
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356 | } |
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357 | |
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358 | auto & list = lists[w]; |
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359 | // If list looks empty retry |
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360 | if( list.ts() == 0 ) return nullptr; |
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361 | |
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362 | // If we can't get the lock retry |
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363 | if( !list.lock.try_lock() ) return nullptr; |
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364 | |
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365 | #if VARIANT == VANILLA || VARIANT == BITMASK |
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366 | __attribute__((unused)) int num = numNonEmpty; |
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367 | #endif |
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368 | |
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369 | // If list is empty, unlock and retry |
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370 | if( list.ts() == 0 ) { |
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371 | list.lock.unlock(); |
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372 | return nullptr; |
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373 | } |
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374 | |
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375 | // Actually pop the list |
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376 | node_t * node; |
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377 | bool emptied; |
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378 | std::tie(node, emptied) = list.pop(); |
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379 | assert(node); |
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380 | |
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381 | if(emptied) { |
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382 | #if VARIANT == DISCOVER |
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383 | size_t qword = w >> 6ull; |
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384 | size_t bit = w & 63ull; |
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385 | assert(qword == 0); |
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386 | __attribute__((unused)) bool ret = btr(tls.mask, bit); |
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387 | snzm.depart(w); |
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388 | #elif VARIANT == SNZI || VARIANT == BIAS || VARIANT == BACK || VARIANT == BACKBIAS |
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389 | snzi.depart(w); |
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390 | #elif VARIANT == SNZM |
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391 | snzm.depart(w); |
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392 | #elif VARIANT == BITMASK |
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393 | numNonEmpty--; |
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394 | size_t qword = w >> 6ull; |
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395 | size_t bit = w & 63ull; |
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396 | assert((list_mask[qword] & (1ul << bit)) != 0); |
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397 | __attribute__((unused)) bool ret = btr(list_mask[qword], bit); |
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398 | assert(ret); |
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399 | assert((list_mask[qword] & (1ul << bit)) == 0); |
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400 | #else |
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401 | numNonEmpty--; |
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402 | #endif |
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403 | } |
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404 | |
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405 | // Unlock and return |
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406 | list.lock.unlock(); |
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407 | #if VARIANT == VANILLA || VARIANT == BITMASK |
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408 | assert(numNonEmpty >= 0); |
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409 | #endif |
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410 | #ifndef NO_STATS |
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411 | tls.pick.pop.success++; |
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412 | #if VARIANT == VANILLA || VARIANT == BITMASK |
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413 | tls.empty.pop.value += num; |
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414 | tls.empty.pop.count += 1; |
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415 | #endif |
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416 | #endif |
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417 | return node; |
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418 | } |
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419 | |
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420 | inline unsigned idx_from_r(unsigned r, bool bias) { |
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421 | unsigned i; |
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422 | if(bias) { |
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423 | if(0 == (r & 0xF)) { |
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424 | i = r >> 4; |
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425 | } else { |
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426 | i = tls.my_queue + ((r >> 4) % 4); |
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427 | tls.pick.push.local++; |
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428 | } |
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429 | } else { |
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430 | i = r; |
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431 | } |
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432 | return i % numLists; |
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433 | } |
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434 | |
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435 | public: |
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436 | |
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437 | static __attribute__((aligned(128))) thread_local struct TLS { |
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438 | Random rng1 = { unsigned(std::hash<std::thread::id>{}(std::this_thread::get_id()) ^ rdtscl()) }; |
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439 | Random rng2 = { unsigned(std::hash<std::thread::id>{}(std::this_thread::get_id()) ^ rdtscl()) }; |
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440 | unsigned my_queue = (ticket++) * 4; |
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441 | pick_stat pick; |
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442 | empty_stat empty; |
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443 | __attribute__((aligned(64))) std::atomic_size_t mask = { 0 }; |
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444 | } tls; |
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445 | |
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446 | private: |
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447 | const unsigned numLists; |
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448 | __attribute__((aligned(64))) std::unique_ptr<intrusive_queue_t<node_t> []> lists; |
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449 | private: |
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450 | #if VARIANT == SNZI || VARIANT == BIAS || VARIANT == BACK || VARIANT == BACKBIAS |
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451 | snzi_t snzi; |
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452 | #elif VARIANT == SNZM || VARIANT == DISCOVER |
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453 | snzm_t snzm; |
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454 | #else |
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455 | std::atomic_int numNonEmpty = { 0 }; // number of non-empty lists |
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456 | #endif |
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457 | #if VARIANT == BITMASK |
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458 | std::atomic_size_t list_mask[7] = { {0}, {0}, {0}, {0}, {0}, {0}, {0} }; // which queues are empty |
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459 | #endif |
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460 | |
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461 | public: |
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462 | static const constexpr size_t sizeof_queue = sizeof(intrusive_queue_t<node_t>); |
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463 | static std::atomic_uint32_t ticket; |
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464 | |
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465 | #ifndef NO_STATS |
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466 | static void stats_tls_tally() { |
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467 | global_stats.pick.push.attempt += tls.pick.push.attempt; |
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468 | global_stats.pick.push.success += tls.pick.push.success; |
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469 | global_stats.pick.push.local += tls.pick.push.local; |
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470 | global_stats.pick.pop .attempt += tls.pick.pop.attempt; |
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471 | global_stats.pick.pop .success += tls.pick.pop.success; |
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472 | global_stats.pick.pop .mask_attempt += tls.pick.pop.mask_attempt; |
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473 | global_stats.pick.pop .mask_reset += tls.pick.pop.mask_reset; |
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474 | global_stats.pick.pop .local += tls.pick.pop.local; |
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475 | |
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476 | global_stats.qstat.push.value += tls.empty.push.value; |
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477 | global_stats.qstat.push.count += tls.empty.push.count; |
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478 | global_stats.qstat.pop .value += tls.empty.pop .value; |
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479 | global_stats.qstat.pop .count += tls.empty.pop .count; |
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480 | } |
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481 | |
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482 | private: |
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483 | static struct GlobalStats { |
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484 | struct { |
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485 | struct { |
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486 | std::atomic_size_t attempt = { 0 }; |
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487 | std::atomic_size_t success = { 0 }; |
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488 | std::atomic_size_t local = { 0 }; |
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489 | } push; |
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490 | struct { |
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491 | std::atomic_size_t attempt = { 0 }; |
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492 | std::atomic_size_t success = { 0 }; |
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493 | std::atomic_size_t mask_attempt = { 0 }; |
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494 | std::atomic_size_t mask_reset = { 0 }; |
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495 | std::atomic_size_t local = { 0 }; |
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496 | } pop; |
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497 | } pick; |
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498 | struct { |
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499 | struct { |
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500 | std::atomic_size_t value = { 0 }; |
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501 | std::atomic_size_t count = { 0 }; |
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502 | } push; |
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503 | struct { |
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504 | std::atomic_size_t value = { 0 }; |
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505 | std::atomic_size_t count = { 0 }; |
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506 | } pop; |
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507 | } qstat; |
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508 | } global_stats; |
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509 | |
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510 | public: |
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511 | static void stats_print(std::ostream & os ) { |
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512 | std::cout << "----- Relaxed List Stats -----" << std::endl; |
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513 | |
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514 | const auto & global = global_stats; |
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515 | |
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516 | double push_sur = (100.0 * double(global.pick.push.success) / global.pick.push.attempt); |
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517 | double pop_sur = (100.0 * double(global.pick.pop .success) / global.pick.pop .attempt); |
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518 | double mpop_sur = (100.0 * double(global.pick.pop .success) / global.pick.pop .mask_attempt); |
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519 | double rpop_sur = (100.0 * double(global.pick.pop .success) / global.pick.pop .mask_reset); |
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520 | |
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521 | double push_len = double(global.pick.push.attempt ) / global.pick.push.success; |
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522 | double pop_len = double(global.pick.pop .attempt ) / global.pick.pop .success; |
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523 | double mpop_len = double(global.pick.pop .mask_attempt) / global.pick.pop .success; |
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524 | double rpop_len = double(global.pick.pop .mask_reset ) / global.pick.pop .success; |
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525 | |
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526 | os << "Push Pick : " << push_sur << " %, len " << push_len << " (" << global.pick.push.attempt << " / " << global.pick.push.success << ")\n"; |
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527 | os << "Pop Pick : " << pop_sur << " %, len " << pop_len << " (" << global.pick.pop .attempt << " / " << global.pick.pop .success << ")\n"; |
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528 | os << "TryPop Pick : " << mpop_sur << " %, len " << mpop_len << " (" << global.pick.pop .mask_attempt << " / " << global.pick.pop .success << ")\n"; |
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529 | os << "Pop M Reset : " << rpop_sur << " %, len " << rpop_len << " (" << global.pick.pop .mask_reset << " / " << global.pick.pop .success << ")\n"; |
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530 | |
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531 | double avgQ_push = double(global.qstat.push.value) / global.qstat.push.count; |
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532 | double avgQ_pop = double(global.qstat.pop .value) / global.qstat.pop .count; |
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533 | double avgQ = double(global.qstat.push.value + global.qstat.pop .value) / (global.qstat.push.count + global.qstat.pop .count); |
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534 | os << "Push Avg Qs : " << avgQ_push << " (" << global.qstat.push.count << "ops)\n"; |
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535 | os << "Pop Avg Qs : " << avgQ_pop << " (" << global.qstat.pop .count << "ops)\n"; |
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536 | os << "Global Avg Qs : " << avgQ << " (" << (global.qstat.push.count + global.qstat.pop .count) << "ops)\n"; |
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537 | |
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538 | os << "Local Push : " << global.pick.push.local << "\n"; |
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539 | os << "Local Pop : " << global.pick.pop .local << "\n"; |
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540 | } |
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541 | #endif |
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542 | }; |
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