src/Tuner/multituner.cc

   1 #include "multituner.h"
   2 #include "csolver.h"
   3 #include "searchtuner.h"
   4 #include <math.h>
   5 #include <stdlib.h>
   6 #include <float.h>
   7 #include <string.h>
   8 #include <iostream>
   9 #include <fstream>
  10 #include <limits>
  11
  12 #define UNSETVALUE -1
  13
  14 Problem::Problem(const char *_problem) :
  15         problemnumber(-1),
  16         result(UNSETVALUE),
  17         besttime(LLONG_MAX)
  18 {
  19         uint len = strlen(_problem);
  20         problem = (char *) ourmalloc(len + 1);
  21         memcpy(problem, _problem, len + 1);
  22 }
  23
  24 Problem::~Problem() {
  25         ourfree(problem);
  26 }
  27
  28 void TunerRecord::setTime(Problem *problem, long long time) {
  29         timetaken.put(problem, time);
  30 }
  31
  32 long long TunerRecord::getTime(Problem *problem) {
  33         if (timetaken.contains(problem))
  34                 return timetaken.get(problem);
  35         else return -1;
  36 }
  37
  38 TunerRecord *TunerRecord::changeTuner(SearchTuner *_newtuner) {
  39         TunerRecord *tr = new TunerRecord(_newtuner);
  40         for (uint i = 0; i < problems.getSize(); i++) {
  41                 tr->problems.push(problems.get(i));
  42         }
  43         return tr;
  44 }
  45
  46 MultiTuner::MultiTuner(uint _budget, uint _rounds, uint _timeout) :
  47         budget(_budget), rounds(_rounds), timeout(_timeout), execnum(0) {
  48 }
  49
  50 MultiTuner::~MultiTuner() {
  51         for (uint i = 0; i < problems.getSize(); i++)
  52                 ourfree(problems.get(i));
  53         for (uint i = 0; i < allTuners.getSize(); i++)
  54                 delete allTuners.get(i);
  55 }
  56
  57 void MultiTuner::addProblem(const char *filename) {
  58         Problem *p = new Problem(filename);
  59         p->problemnumber = problems.getSize();
  60         problems.push(p);
  61 }
  62
  63 void MultiTuner::printData() {
  64         model_print("*********** DATA DUMP ***********\n");
  65         for (uint i = 0; i < allTuners.getSize(); i++) {
  66                 TunerRecord *tuner = allTuners.get(i);
  67                 SearchTuner *stun = tuner->getTuner();
  68                 model_print("Tuner %u\n", i);
  69                 stun->print();
  70                 model_print("----------------------------------\n\n\n");
  71                 for (uint j = 0; j < tuner->problems.getSize(); j++) {
  72                         Problem *problem = tuner->problems.get(j);
  73                         model_print("Problem %s\n", problem->getProblem());
  74                         model_print("Time = %lld\n", tuner->getTime(problem));
  75                 }
  76         }
  77 }
  78
  79 void MultiTuner::findBestThreeTuners() {
  80         if (allTuners.getSize() < 3) {
  81                 printData();
  82                 return;
  83         }
  84         TunerRecord *bestTuners[3];
  85         double score = DBL_MAX;
  86         for (uint i = 0; i < allTuners.getSize() - 2; i++) {
  87                 for (uint j = i + 1; j < allTuners.getSize() - 1; j++) {
  88                         for (uint k = j + 1; k < allTuners.getSize(); k++) {
  89                                 TunerRecord *tuner1 = allTuners.get(i);
  90                                 TunerRecord *tuner2 = allTuners.get(j);
  91                                 TunerRecord *tuner3 = allTuners.get(k);
  92                                 double mintimes[problems.getSize()];
  93                                 for (uint l = 0; l < problems.getSize(); l++) {
  94                                         Problem *problem = problems.get(l);
  95                                         mintimes[l] = pow(min(tuner1->getTime(problem), tuner2->getTime(problem), tuner3->getTime(problem)), (double)1 / problems.getSize());
  96                                 }
  97                                 double result = 1;
  98                                 for (uint l = 0; l < problems.getSize(); l++) {
  99                                         result *= mintimes[l];
 100                                 }
 101                                 if (result < score) {
 102                                         score = result;
 103                                         bestTuners[0] = tuner1;
 104                                         bestTuners[1] = tuner2;
 105                                         bestTuners[2] = tuner3;
 106                                 }
 107                         }
 108                 }
 109         }
 110         model_print("Best 3 tuners:\n");
 111         for (uint i = 0; i < 3; i++) {
 112                 TunerRecord *tuner = bestTuners[i];
 113                 SearchTuner *stun = tuner->getTuner();
 114                 char buffer[512];
 115                 snprintf(buffer, sizeof(buffer), "best%u.tuner", i);
 116                 stun->serialize(buffer);
 117                 model_print("Tuner %u\n", tuner->tunernumber);
 118                 stun->print();
 119                 for (uint j = 0; j < tuner->problems.getSize(); j++) {
 120                         Problem *problem = tuner->problems.get(j);
 121                         model_print("Problem %s\n", problem->getProblem());
 122                         model_print("Time = %lld\n", tuner->getTime(problem));
 123                 }
 124                 model_print("----------------------------------\n\n\n");
 125         }
 126 }
 127
 128 void MultiTuner::addTuner(SearchTuner *tuner) {
 129         TunerRecord *t = new TunerRecord(tuner);
 130         tuners.push(t);
 131         t->tunernumber = allTuners.getSize();
 132         allTuners.push(t);
 133 }
 134
 135
 136 void MultiTuner::readData(uint numRuns) {
 137         for (uint i = 0; i < numRuns; i++) {
 138                 ifstream myfile;
 139                 char buffer[512];
 140                 uint tunernumber;
 141                 snprintf(buffer, sizeof(buffer), "tunernum%u", i);
 142                 myfile.open (buffer, ios::in);
 143                 myfile >> tunernumber;
 144                 myfile.close();
 145                 if (allTuners.getSize() <= tunernumber)
 146                         allTuners.setSize(tunernumber + 1);
 147                 if (allTuners.get(tunernumber) == NULL) {
 148                         snprintf(buffer, sizeof(buffer), "tuner%u", i);
 149                         allTuners.set(tunernumber, new TunerRecord(new SearchTuner(buffer), tunernumber));
 150                 }
 151                 //Add any new used records
 152                 snprintf(buffer, sizeof(buffer), "tuner%uused", i);
 153                 TunerRecord *tuner = allTuners.get(tunernumber);
 154                 tuner->getTuner()->addUsed(buffer);
 155
 156                 char problemname[512];
 157                 uint problemnumber;
 158                 snprintf(buffer, sizeof(buffer), "problem%u", i);
 159                 myfile.open(buffer, ios::in);
 160                 myfile.getline(problemname, sizeof(problemname));
 161                 myfile >> problemnumber;
 162                 myfile.close();
 163                 if (problems.getSize() <= problemnumber)
 164                         problems.setSize(problemnumber + 1);
 165                 if (problems.get(problemnumber) == NULL)
 166                         problems.set(problemnumber, new Problem(problemname));
 167                 Problem *problem = problems.get(problemnumber);
 168                 long long metric = -1;
 169                 int sat = IS_INDETER;
 170                 //Read data in from results file
 171                 snprintf(buffer, sizeof(buffer), "result%u", i);
 172
 173                 myfile.open (buffer, ios::in);
 174
 175
 176                 if (myfile.is_open()) {
 177                         myfile >> metric;
 178                         myfile >> sat;
 179                         myfile.close();
 180                 }
 181                 if (problem->result == UNSETVALUE && sat != IS_INDETER) {
 182                         problem->result = sat;
 183                 } else if (problem->result != sat && sat != IS_INDETER) {
 184                         model_print("******** Result has changed ********\n");
 185                 }
 186
 187                 if (metric != -1) {
 188                         if (tuner->getTime(problem) == -1)
 189                                 tuner->problems.push(problem);
 190                         tuner->setTime(problem, metric);
 191                 }
 192
 193         }
 194
 195 }
 196
 197 long long MultiTuner::evaluate(Problem *problem, TunerRecord *tuner) {
 198         char buffer[512];
 199         {
 200                 snprintf(buffer, sizeof(buffer), "problem%u", execnum);
 201
 202                 ofstream myfile;
 203                 myfile.open (buffer, ios::out);
 204
 205
 206                 if (myfile.is_open()) {
 207                         myfile << problem->getProblem() << endl;
 208                         myfile << problem->problemnumber << endl;
 209                         myfile.close();
 210                 }
 211         }
 212
 213         {
 214                 snprintf(buffer, sizeof(buffer), "tunernum%u", execnum);
 215
 216                 ofstream myfile;
 217                 myfile.open (buffer, ios::out);
 218
 219
 220                 if (myfile.is_open()) {
 221                         myfile << tuner->tunernumber << endl;
 222                         myfile.close();
 223                 }
 224         }
 225
 226         //Write out the tuner
 227         snprintf(buffer, sizeof(buffer), "tuner%u", execnum);
 228         tuner->getTuner()->serialize(buffer);
 229
 230         //compute timeout
 231         uint timeinsecs = problem->besttime / NANOSEC;
 232         uint adaptive = (timeinsecs > 30) ? timeinsecs * 5 : 150;
 233         uint maxtime = (adaptive < timeout) ? adaptive : timeout;
 234
 235         //Do run
 236         snprintf(buffer, sizeof(buffer), "./run.sh deserializerun %s %u tuner%u result%u > log%u", problem->getProblem(), maxtime, execnum, execnum, execnum);
 237         int status = system(buffer);
 238
 239         long long metric = -1;
 240         int sat = IS_INDETER;
 241
 242         if (status == 0) {
 243                 //Read data in from results file
 244                 snprintf(buffer, sizeof(buffer), "result%u", execnum);
 245
 246                 ifstream myfile;
 247                 myfile.open (buffer, ios::in);
 248
 249
 250                 if (myfile.is_open()) {
 251                         myfile >> metric;
 252                         myfile >> sat;
 253                         myfile.close();
 254                 }
 255                 updateTimeout(problem, metric);
 256                 snprintf(buffer, sizeof(buffer), "tuner%uused", execnum);
 257                 tuner->getTuner()->addUsed(buffer);
 258         }
 259         //Increment execution count
 260         execnum++;
 261
 262         if (problem->result == UNSETVALUE && sat != IS_INDETER) {
 263                 problem->result = sat;
 264         } else if (problem->result != sat && sat != IS_INDETER) {
 265                 model_print("******** Result has changed ********\n");
 266         }
 267         if (sat == IS_INDETER && metric != -1) {//The case when we have a timeout
 268                 metric = -1;
 269         }
 270         return metric;
 271 }
 272
 273 void MultiTuner::updateTimeout(Problem *problem, long long metric) {
 274         if (metric < problem->besttime) {
 275                 problem->besttime = metric;
 276         }
 277 }
 278
 279 void MultiTuner::tuneComp() {
 280         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 281         for (uint b = 0; b < budget; b++) {
 282                 model_print("Round %u of %u\n", b, budget);
 283                 uint tSize = tunerV->getSize();
 284                 for (uint i = 0; i < tSize; i++) {
 285                         SearchTuner *tmpTuner = mutateTuner(tunerV->get(i)->getTuner(), b);
 286                         TunerRecord *tmp = new TunerRecord(tmpTuner);
 287                         tmp->tunernumber = allTuners.getSize();
 288                         model_print("Mutated tuner %u to generate tuner %u\n", tunerV->get(i)->tunernumber, tmp->tunernumber);
 289                         allTuners.push(tmp);
 290                         tunerV->push(tmp);
 291                 }
 292
 293                 Hashtable<TunerRecord *, int, uint64_t> scores;
 294                 for (uint i = 0; i < problems.getSize(); i++) {
 295                         Problem *problem = problems.get(i);
 296                         Vector<TunerRecord *> places;
 297                         for (uint j = 0; j < tunerV->getSize(); j++) {
 298                                 TunerRecord *tuner = tunerV->get(j);
 299                                 long long metric = tuner->getTime(problem);
 300                                 if (metric == -1) {
 301                                         metric = evaluate(problem, tuner);
 302                                         if (tuner->getTime(problem) == -1) {
 303                                                 tuner->problems.push(problem);
 304                                         }
 305                                         model_print("%u.Problem<%s>\tTuner<%p, %d>\tMetric<%lld>\n", i, problem->problem,tuner, tuner->tunernumber, metric);
 306                                         model_print("*****************************\n");
 307                                         if (metric != -1)
 308                                                 tuner->setTime(problem, metric);
 309                                         else
 310                                                 tuner->setTime(problem, -2);
 311                                 }
 312                                 if (metric >= 0) {
 313                                         uint k = 0;
 314                                         for (; k < places.getSize(); k++) {
 315                                                 if (metric < places.get(k)->getTime(problem))
 316                                                         break;
 317                                         }
 318                                         model_print("place[%u]=Tuner<%p,%d>\n", k, tuner, tuner->tunernumber);
 319                                         places.insertAt(k, tuner);
 320                                 }
 321                         }
 322                         int points = 9;
 323                         for (uint k = 0; k < places.getSize() && points; k++) {
 324                                 TunerRecord *tuner = places.get(k);
 325                                 int currScore = 0;
 326                                 if (scores.contains(tuner))
 327                                         currScore = scores.get(tuner);
 328                                 currScore += points;
 329                                 model_print("Problem<%s>\tTuner<%p,%d>\tmetric<%d>\n", problem->problem, tuner, tuner->tunernumber,  currScore);
 330                                 model_print("**************************\n");
 331                                 scores.put(tuner, currScore);
 332                                 points = points / 3;
 333                         }
 334                 }
 335                 Vector<TunerRecord *> ranking;
 336                 for (uint i = 0; i < tunerV->getSize(); i++) {
 337                         TunerRecord *tuner = tunerV->get(i);
 338                         int score = 0;
 339                         if (scores.contains(tuner))
 340                                 score = scores.get(tuner);
 341                         uint j = 0;
 342                         for (; j < ranking.getSize(); j++) {
 343                                 TunerRecord *t = ranking.get(j);
 344                                 int tscore = 0;
 345                                 if (scores.contains(t))
 346                                         tscore = scores.get(t);
 347                                 if (score > tscore)
 348                                         break;
 349                         }
 350                         model_print("ranking[%u]=tuner<%p,%u>(Score=%d)\n", j, tuner, tuner->tunernumber, score);
 351                         model_print("************************\n");
 352                         ranking.insertAt(j, tuner);
 353                 }
 354                 model_print("tunerSize=%u\trankingSize=%u\ttunerVSize=%u\n", tuners.getSize(), ranking.getSize(), tunerV->getSize());
 355                 for (uint i = tuners.getSize(); i < ranking.getSize(); i++) {
 356                         TunerRecord *tuner = ranking.get(i);
 357                         model_print("Removing tuner %u\n", tuner->tunernumber);
 358                         for (uint j = 0; j < tunerV->getSize(); j++) {
 359                                 if (tunerV->get(j) == tuner)
 360                                         tunerV->removeAt(j);
 361                         }
 362                 }
 363         }
 364         printData();
 365 }
 366
 367 void MultiTuner::mapProblemsToTuners(Vector<TunerRecord *> *tunerV) {
 368         for (uint i = 0; i < problems.getSize(); i++) {
 369                 Problem *problem = problems.get(i);
 370                 TunerRecord *bestTuner = NULL;
 371                 long long bestscore = 0;
 372                 for (uint j = 0; j < tunerV->getSize(); j++) {
 373                         TunerRecord *tuner = tunerV->get(j);
 374                         long long metric = tuner->getTime(problem);
 375                         if (metric == -1) {
 376                                 metric = evaluate(problem, tuner);
 377                                 if (metric != -1)
 378                                         tuner->setTime(problem, metric);
 379                                 else
 380                                         tuner->setTime(problem, -2);
 381                         }
 382                         if ((bestTuner == NULL && metric >= 0) ||
 383                                         (metric < bestscore && metric >= 0)) {
 384                                 bestTuner = tuner;
 385                                 bestscore = metric;
 386                         }
 387                 }
 388                 if (bestTuner != NULL)
 389                         bestTuner->problems.push(problem);
 390         }
 391 }
 392
 393 void clearVector(Vector<TunerRecord *> *tunerV) {
 394         for (uint j = 0; j < tunerV->getSize(); j++) {
 395                 TunerRecord *tuner = tunerV->get(j);
 396                 tuner->problems.clear();
 397         }
 398 }
 399
 400 void MultiTuner::tuneK() {
 401         Vector<TunerRecord *> *tunerV = new Vector<TunerRecord *>(&tuners);
 402         for (uint i = 0; i < rounds; i++) {
 403                 clearVector(tunerV);
 404                 mapProblemsToTuners(tunerV);
 405                 improveTuners(tunerV);
 406         }
 407         model_print("Best tuners\n");
 408         for (uint j = 0; j < tunerV->getSize(); j++) {
 409                 TunerRecord *tuner = tunerV->get(j);
 410                 char buffer[256];
 411                 sprintf(buffer, "tuner%u.conf", j);
 412                 tuner->getTuner()->serialize(buffer);
 413                 tuner->getTuner()->print();
 414         }
 415         delete tunerV;
 416 }
 417
 418 void MultiTuner::improveTuners(Vector<TunerRecord *> *tunerV) {
 419         for (uint j = 0; j < tunerV->getSize(); j++) {
 420                 TunerRecord *tuner = tunerV->get(j);
 421                 TunerRecord *newtuner = tune(tuner);
 422                 tunerV->set(j, newtuner);
 423         }
 424 }
 425
 426 double MultiTuner::evaluateAll(TunerRecord *tuner) {
 427         double product = 1;
 428         for (uint i = 0; i < tuner->problems.getSize(); i++) {
 429                 Problem *problem = tuner->problems.get(i);
 430                 long long metric = tuner->getTime(problem);
 431                 if (metric == -1) {
 432                         metric = evaluate(problem, tuner);
 433                         if (metric != -1)
 434                                 tuner->setTime(problem, metric);
 435                         else
 436                                 tuner->setTime(problem, -2);
 437                 }
 438
 439                 double score = metric;
 440                 if (metric < 0)
 441                         score = timeout;
 442                 product *= score;
 443         }
 444         return pow(product, 1 / ((double)tuner->problems.getSize()));
 445 }
 446
 447 SearchTuner *MultiTuner::mutateTuner(SearchTuner *oldTuner, uint k) {
 448         SearchTuner *newTuner = oldTuner->copyUsed();
 449         uint numSettings = oldTuner->getSize();
 450         uint settingsToMutate = (uint)(AUTOTUNERFACTOR * (((double)numSettings) * (budget - k)) / (budget));
 451         if (settingsToMutate < 1)
 452                 settingsToMutate = 1;
 453         model_print("Mutating %u settings\n", settingsToMutate);
 454         while (settingsToMutate-- != 0) {
 455                 newTuner->randomMutate();
 456         }
 457         return newTuner;
 458 }
 459
 460 TunerRecord *MultiTuner::tune(TunerRecord *tuner) {
 461         TunerRecord *bestTuner = NULL;
 462         double bestScore = DBL_MAX;
 463
 464         TunerRecord *oldTuner = tuner;
 465         double base_temperature = evaluateAll(oldTuner);
 466         double oldScore = base_temperature;
 467
 468         for (uint i = 0; i < budget; i++) {
 469                 SearchTuner *tmpTuner = mutateTuner(oldTuner->getTuner(), i);
 470                 TunerRecord *newTuner = oldTuner->changeTuner(tmpTuner);
 471                 newTuner->tunernumber = allTuners.getSize();
 472                 allTuners.push(newTuner);
 473                 double newScore = evaluateAll(newTuner);
 474                 newTuner->tuner->printUsed();
 475                 model_print("Received score %f\n", newScore);
 476                 double scoreDiff = newScore - oldScore; //smaller is better
 477                 if (newScore < bestScore) {
 478                         bestScore = newScore;
 479                         bestTuner = newTuner;
 480                 }
 481
 482                 double acceptanceP;
 483                 if (scoreDiff < 0) {
 484                         acceptanceP = 1;
 485                 } else {
 486                         double currTemp = base_temperature * (((double)budget - i) / budget);
 487                         acceptanceP = exp(-scoreDiff / currTemp);
 488                 }
 489                 double ran = ((double)random()) / RAND_MAX;
 490                 if (ran <= acceptanceP) {
 491                         oldScore = newScore;
 492                         oldTuner = newTuner;
 493                 }
 494         }
 495
 496         return bestTuner;
 497 }
 498