| 1 | #pragma once
|
|---|
| 2 | #define LIST_VARIANT work_stealing
|
|---|
| 3 |
|
|---|
| 4 | #include <cmath>
|
|---|
| 5 | #include <iomanip>
|
|---|
| 6 | #include <memory>
|
|---|
| 7 | #include <mutex>
|
|---|
| 8 | #include <thread>
|
|---|
| 9 | #include <type_traits>
|
|---|
| 10 |
|
|---|
| 11 | #include "assert.hpp"
|
|---|
| 12 | #include "utils.hpp"
|
|---|
| 13 | #include "links.hpp"
|
|---|
| 14 | #include "links2.hpp"
|
|---|
| 15 | #include "snzi.hpp"
|
|---|
| 16 |
|
|---|
| 17 | #include <x86intrin.h>
|
|---|
| 18 |
|
|---|
| 19 | using namespace std;
|
|---|
| 20 |
|
|---|
| 21 | static const long long lim = 2000;
|
|---|
| 22 | static const unsigned nqueues = 2;
|
|---|
| 23 |
|
|---|
| 24 | struct __attribute__((aligned(128))) timestamp_t {
|
|---|
| 25 | volatile unsigned long long val = 0;
|
|---|
| 26 | };
|
|---|
| 27 |
|
|---|
| 28 | template<typename node_t>
|
|---|
| 29 | struct __attribute__((aligned(128))) localQ_t {
|
|---|
| 30 | mpsc_queue<node_t> queue = {};
|
|---|
| 31 | spinlock_t lock = {};
|
|---|
| 32 | bool needs_help = true;
|
|---|
| 33 | };
|
|---|
| 34 |
|
|---|
| 35 | template<typename node_t>
|
|---|
| 36 | class __attribute__((aligned(128))) work_stealing {
|
|---|
| 37 | static_assert(std::is_same<decltype(node_t::_links), _LinksFields_t<node_t>>::value, "Node must have a links field");
|
|---|
| 38 |
|
|---|
| 39 | public:
|
|---|
| 40 | static const char * name() {
|
|---|
| 41 | return "Work Stealing";
|
|---|
| 42 | }
|
|---|
| 43 |
|
|---|
| 44 | work_stealing(unsigned _numThreads, unsigned)
|
|---|
| 45 | : numThreads(_numThreads * nqueues)
|
|---|
| 46 | , lists(new intrusive_queue_t<node_t>[numThreads])
|
|---|
| 47 | , times(new timestamp_t[numThreads])
|
|---|
| 48 | // , snzi( std::log2( numThreads / 2 ), 2 )
|
|---|
| 49 |
|
|---|
| 50 | {
|
|---|
| 51 | std::cout << "Constructing Work Stealer with " << numThreads << std::endl;
|
|---|
| 52 | }
|
|---|
| 53 |
|
|---|
| 54 | ~work_stealing() {
|
|---|
| 55 | std::cout << "Destroying Work Stealer" << std::endl;
|
|---|
| 56 | lists.reset();
|
|---|
| 57 | }
|
|---|
| 58 |
|
|---|
| 59 | __attribute__((noinline, hot)) void push(node_t * node) {
|
|---|
| 60 | // node->_links.ts = rdtscl();
|
|---|
| 61 | node->_links.ts = 1;
|
|---|
| 62 |
|
|---|
| 63 | auto & list = *({
|
|---|
| 64 | unsigned i;
|
|---|
| 65 | do {
|
|---|
| 66 | tls.stats.push.attempt++;
|
|---|
| 67 | // unsigned r = tls.rng1.next();
|
|---|
| 68 | unsigned r = tls.it++;
|
|---|
| 69 | if(tls.my_queue == outside) {
|
|---|
| 70 | i = r % numThreads;
|
|---|
| 71 | } else {
|
|---|
| 72 | i = tls.my_queue + (r % nqueues);
|
|---|
| 73 | }
|
|---|
| 74 | } while(!lists[i].lock.try_lock());
|
|---|
| 75 | &lists[i];
|
|---|
| 76 | });
|
|---|
| 77 |
|
|---|
| 78 | list.push( node );
|
|---|
| 79 | list.lock.unlock();
|
|---|
| 80 | // tls.rng2.set_raw_state( tls.rng1.get_raw_state());
|
|---|
| 81 | // count++;
|
|---|
| 82 | tls.stats.push.success++;
|
|---|
| 83 | }
|
|---|
| 84 |
|
|---|
| 85 | __attribute__((noinline, hot)) node_t * pop() {
|
|---|
| 86 | if( tls.myfriend == outside ) {
|
|---|
| 87 | auto r = tls.rng1.next();
|
|---|
| 88 | tls.myfriend = r % numThreads;
|
|---|
| 89 | times[tls.myfriend].val = 0;
|
|---|
| 90 | }
|
|---|
| 91 | else if(times[tls.myfriend].val == 0) {
|
|---|
| 92 | node_t * n = try_pop(tls.myfriend, tls.stats.pop.help);
|
|---|
| 93 | tls.stats.help++;
|
|---|
| 94 | tls.myfriend = outside;
|
|---|
| 95 | if(n) return n;
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| 98 | if(tls.my_queue != outside) {
|
|---|
| 99 | node_t * n = local();
|
|---|
| 100 | if(n) return n;
|
|---|
| 101 | }
|
|---|
| 102 |
|
|---|
| 103 | // try steal
|
|---|
| 104 | for(int i = 0; i < 25; i++) {
|
|---|
| 105 | node_t * n = steal();
|
|---|
| 106 | if(n) return n;
|
|---|
| 107 | }
|
|---|
| 108 |
|
|---|
| 109 | return search();
|
|---|
| 110 | }
|
|---|
| 111 |
|
|---|
| 112 | private:
|
|---|
| 113 | inline node_t * local() {
|
|---|
| 114 | // unsigned i = (tls.rng2.prev() % 4) + tls.my_queue;
|
|---|
| 115 | unsigned i = (--tls.it % nqueues) + tls.my_queue;
|
|---|
| 116 | return try_pop(i, tls.stats.pop.local);
|
|---|
| 117 | }
|
|---|
| 118 |
|
|---|
| 119 | inline node_t * steal() {
|
|---|
| 120 | unsigned i = tls.rng2.prev() % numThreads;
|
|---|
| 121 | return try_pop(i, tls.stats.pop.steal);
|
|---|
| 122 | }
|
|---|
| 123 |
|
|---|
| 124 | inline node_t * search() {
|
|---|
| 125 | unsigned offset = tls.rng2.prev();
|
|---|
| 126 | for(unsigned i = 0; i < numThreads; i++) {
|
|---|
| 127 | unsigned idx = (offset + i) % numThreads;
|
|---|
| 128 | node_t * thrd = try_pop(idx, tls.stats.pop.search);
|
|---|
| 129 | if(thrd) {
|
|---|
| 130 | return thrd;
|
|---|
| 131 | }
|
|---|
| 132 | }
|
|---|
| 133 |
|
|---|
| 134 | return nullptr;
|
|---|
| 135 | }
|
|---|
| 136 |
|
|---|
| 137 | private:
|
|---|
| 138 | struct attempt_stat_t {
|
|---|
| 139 | std::size_t attempt = { 0 };
|
|---|
| 140 | std::size_t elock = { 0 };
|
|---|
| 141 | std::size_t eempty = { 0 };
|
|---|
| 142 | std::size_t espec = { 0 };
|
|---|
| 143 | std::size_t success = { 0 };
|
|---|
| 144 | };
|
|---|
| 145 |
|
|---|
| 146 | node_t * try_pop(unsigned i, attempt_stat_t & stat) {
|
|---|
| 147 | assert(i < numThreads);
|
|---|
| 148 | auto & list = lists[i];
|
|---|
| 149 | stat.attempt++;
|
|---|
| 150 |
|
|---|
| 151 | // If the list is empty, don't try
|
|---|
| 152 | if(list.ts() == 0) { stat.espec++; return nullptr; }
|
|---|
| 153 |
|
|---|
| 154 | // If we can't get the lock, move on
|
|---|
| 155 | if( !list.lock.try_lock() ) { stat.elock++; return nullptr; }
|
|---|
| 156 |
|
|---|
| 157 |
|
|---|
| 158 | // If list is empty, unlock and retry
|
|---|
| 159 | if( list.ts() == 0 ) {
|
|---|
| 160 | list.lock.unlock();
|
|---|
| 161 | stat.eempty++;
|
|---|
| 162 | return nullptr;
|
|---|
| 163 | }
|
|---|
| 164 |
|
|---|
| 165 | auto node = list.pop();
|
|---|
| 166 | list.lock.unlock();
|
|---|
| 167 | stat.success++;
|
|---|
| 168 | times[i].val = 1; //node.first->_links.ts;
|
|---|
| 169 | // count--;
|
|---|
| 170 | // _mm_stream_si64((long long int*)×[i].val, node.first->_links.ts);
|
|---|
| 171 | return node.first;
|
|---|
| 172 | }
|
|---|
| 173 |
|
|---|
| 174 |
|
|---|
| 175 | public:
|
|---|
| 176 |
|
|---|
| 177 | static std::atomic_uint32_t ticket;
|
|---|
| 178 | static const unsigned outside = 0xFFFFFFFF;
|
|---|
| 179 |
|
|---|
| 180 | static inline unsigned calc_preferred() {
|
|---|
| 181 | unsigned t = ticket++;
|
|---|
| 182 | if(t == 0) return outside;
|
|---|
| 183 | unsigned i = (t - 1) * nqueues;
|
|---|
| 184 | return i;
|
|---|
| 185 | }
|
|---|
| 186 |
|
|---|
| 187 | static __attribute__((aligned(128))) thread_local struct TLS {
|
|---|
| 188 | Random rng1 = { unsigned(std::hash<std::thread::id>{}(std::this_thread::get_id()) ^ rdtscl()) };
|
|---|
| 189 | Random rng2 = { unsigned(std::hash<std::thread::id>{}(std::this_thread::get_id()) ^ rdtscl()) };
|
|---|
| 190 | unsigned it = 0;
|
|---|
| 191 | unsigned my_queue = calc_preferred();
|
|---|
| 192 | unsigned myfriend = outside;
|
|---|
| 193 | #if defined(READ)
|
|---|
| 194 | unsigned it = 0;
|
|---|
| 195 | #endif
|
|---|
| 196 | struct {
|
|---|
| 197 | struct {
|
|---|
| 198 | std::size_t attempt = { 0 };
|
|---|
| 199 | std::size_t success = { 0 };
|
|---|
| 200 | } push;
|
|---|
| 201 | struct {
|
|---|
| 202 | attempt_stat_t help;
|
|---|
| 203 | attempt_stat_t local;
|
|---|
| 204 | attempt_stat_t steal;
|
|---|
| 205 | attempt_stat_t search;
|
|---|
| 206 | } pop;
|
|---|
| 207 | std::size_t help = { 0 };
|
|---|
| 208 | } stats;
|
|---|
| 209 | } tls;
|
|---|
| 210 |
|
|---|
| 211 | private:
|
|---|
| 212 | const unsigned numThreads;
|
|---|
| 213 | std::unique_ptr<intrusive_queue_t<node_t> []> lists;
|
|---|
| 214 | std::unique_ptr<timestamp_t []> times;
|
|---|
| 215 | __attribute__((aligned(128))) std::atomic_size_t count;
|
|---|
| 216 |
|
|---|
| 217 | #ifndef NO_STATS
|
|---|
| 218 | private:
|
|---|
| 219 | static struct GlobalStats {
|
|---|
| 220 | struct {
|
|---|
| 221 | std::atomic_size_t attempt = { 0 };
|
|---|
| 222 | std::atomic_size_t success = { 0 };
|
|---|
| 223 | } push;
|
|---|
| 224 | struct {
|
|---|
| 225 | struct {
|
|---|
| 226 | std::atomic_size_t attempt = { 0 };
|
|---|
| 227 | std::atomic_size_t elock = { 0 };
|
|---|
| 228 | std::atomic_size_t eempty = { 0 };
|
|---|
| 229 | std::atomic_size_t espec = { 0 };
|
|---|
| 230 | std::atomic_size_t success = { 0 };
|
|---|
| 231 | } help;
|
|---|
| 232 | struct {
|
|---|
| 233 | std::atomic_size_t attempt = { 0 };
|
|---|
| 234 | std::atomic_size_t elock = { 0 };
|
|---|
| 235 | std::atomic_size_t eempty = { 0 };
|
|---|
| 236 | std::atomic_size_t espec = { 0 };
|
|---|
| 237 | std::atomic_size_t success = { 0 };
|
|---|
| 238 | } local;
|
|---|
| 239 | struct {
|
|---|
| 240 | std::atomic_size_t attempt = { 0 };
|
|---|
| 241 | std::atomic_size_t elock = { 0 };
|
|---|
| 242 | std::atomic_size_t eempty = { 0 };
|
|---|
| 243 | std::atomic_size_t espec = { 0 };
|
|---|
| 244 | std::atomic_size_t success = { 0 };
|
|---|
| 245 | } steal;
|
|---|
| 246 | struct {
|
|---|
| 247 | std::atomic_size_t attempt = { 0 };
|
|---|
| 248 | std::atomic_size_t elock = { 0 };
|
|---|
| 249 | std::atomic_size_t eempty = { 0 };
|
|---|
| 250 | std::atomic_size_t espec = { 0 };
|
|---|
| 251 | std::atomic_size_t success = { 0 };
|
|---|
| 252 | } search;
|
|---|
| 253 | } pop;
|
|---|
| 254 | std::atomic_size_t help = { 0 };
|
|---|
| 255 | } global_stats;
|
|---|
| 256 |
|
|---|
| 257 | public:
|
|---|
| 258 | static void stats_tls_tally() {
|
|---|
| 259 | global_stats.push.attempt += tls.stats.push.attempt;
|
|---|
| 260 | global_stats.push.success += tls.stats.push.success;
|
|---|
| 261 | global_stats.pop.help .attempt += tls.stats.pop.help .attempt;
|
|---|
| 262 | global_stats.pop.help .elock += tls.stats.pop.help .elock ;
|
|---|
| 263 | global_stats.pop.help .eempty += tls.stats.pop.help .eempty ;
|
|---|
| 264 | global_stats.pop.help .espec += tls.stats.pop.help .espec ;
|
|---|
| 265 | global_stats.pop.help .success += tls.stats.pop.help .success;
|
|---|
| 266 | global_stats.pop.local .attempt += tls.stats.pop.local .attempt;
|
|---|
| 267 | global_stats.pop.local .elock += tls.stats.pop.local .elock ;
|
|---|
| 268 | global_stats.pop.local .eempty += tls.stats.pop.local .eempty ;
|
|---|
| 269 | global_stats.pop.local .espec += tls.stats.pop.local .espec ;
|
|---|
| 270 | global_stats.pop.local .success += tls.stats.pop.local .success;
|
|---|
| 271 | global_stats.pop.steal .attempt += tls.stats.pop.steal .attempt;
|
|---|
| 272 | global_stats.pop.steal .elock += tls.stats.pop.steal .elock ;
|
|---|
| 273 | global_stats.pop.steal .eempty += tls.stats.pop.steal .eempty ;
|
|---|
| 274 | global_stats.pop.steal .espec += tls.stats.pop.steal .espec ;
|
|---|
| 275 | global_stats.pop.steal .success += tls.stats.pop.steal .success;
|
|---|
| 276 | global_stats.pop.search.attempt += tls.stats.pop.search.attempt;
|
|---|
| 277 | global_stats.pop.search.elock += tls.stats.pop.search.elock ;
|
|---|
| 278 | global_stats.pop.search.eempty += tls.stats.pop.search.eempty ;
|
|---|
| 279 | global_stats.pop.search.espec += tls.stats.pop.search.espec ;
|
|---|
| 280 | global_stats.pop.search.success += tls.stats.pop.search.success;
|
|---|
| 281 | global_stats.help += tls.stats.help;
|
|---|
| 282 | }
|
|---|
| 283 |
|
|---|
| 284 | static void stats_print(std::ostream & os, double duration ) {
|
|---|
| 285 | std::cout << "----- Work Stealing Stats -----" << std::endl;
|
|---|
| 286 |
|
|---|
| 287 | double push_suc = (100.0 * double(global_stats.push.success) / global_stats.push.attempt);
|
|---|
| 288 | double push_len = double(global_stats.push.attempt ) / global_stats.push.success;
|
|---|
| 289 | os << "Push Pick : " << push_suc << " %, len " << push_len << " (" << global_stats.push.attempt << " / " << global_stats.push.success << ")\n";
|
|---|
| 290 |
|
|---|
| 291 | double hlp_suc = (100.0 * double(global_stats.pop.help.success) / global_stats.pop.help.attempt);
|
|---|
| 292 | double hlp_len = double(global_stats.pop.help.attempt ) / global_stats.pop.help.success;
|
|---|
| 293 | os << "Help : " << hlp_suc << " %, len " << hlp_len << " (" << global_stats.pop.help.attempt << " / " << global_stats.pop.help.success << ")\n";
|
|---|
| 294 | os << "Help Fail : " << global_stats.pop.help.espec << "s, " << global_stats.pop.help.eempty << "e, " << global_stats.pop.help.elock << "l\n";
|
|---|
| 295 |
|
|---|
| 296 | double pop_suc = (100.0 * double(global_stats.pop.local.success) / global_stats.pop.local.attempt);
|
|---|
| 297 | double pop_len = double(global_stats.pop.local.attempt ) / global_stats.pop.local.success;
|
|---|
| 298 | os << "Local : " << pop_suc << " %, len " << pop_len << " (" << global_stats.pop.local.attempt << " / " << global_stats.pop.local.success << ")\n";
|
|---|
| 299 | os << "Local Fail : " << global_stats.pop.local.espec << "s, " << global_stats.pop.local.eempty << "e, " << global_stats.pop.local.elock << "l\n";
|
|---|
| 300 |
|
|---|
| 301 | double stl_suc = (100.0 * double(global_stats.pop.steal.success) / global_stats.pop.steal.attempt);
|
|---|
| 302 | double stl_len = double(global_stats.pop.steal.attempt ) / global_stats.pop.steal.success;
|
|---|
| 303 | os << "Steal : " << stl_suc << " %, len " << stl_len << " (" << global_stats.pop.steal.attempt << " / " << global_stats.pop.steal.success << ")\n";
|
|---|
| 304 | os << "Steal Fail : " << global_stats.pop.steal.espec << "s, " << global_stats.pop.steal.eempty << "e, " << global_stats.pop.steal.elock << "l\n";
|
|---|
| 305 |
|
|---|
| 306 | double srh_suc = (100.0 * double(global_stats.pop.search.success) / global_stats.pop.search.attempt);
|
|---|
| 307 | double srh_len = double(global_stats.pop.search.attempt ) / global_stats.pop.search.success;
|
|---|
| 308 | os << "Search : " << srh_suc << " %, len " << srh_len << " (" << global_stats.pop.search.attempt << " / " << global_stats.pop.search.success << ")\n";
|
|---|
| 309 | os << "Search Fail : " << global_stats.pop.search.espec << "s, " << global_stats.pop.search.eempty << "e, " << global_stats.pop.search.elock << "l\n";
|
|---|
| 310 | os << "Helps : " << std::setw(15) << std::scientific << global_stats.help / duration << "/sec (" << global_stats.help << ")\n";
|
|---|
| 311 | }
|
|---|
| 312 | private:
|
|---|
| 313 | #endif
|
|---|
| 314 | };
|
|---|
