1 #include <petsc/private/tsimpl.h> /*I "petscts.h" I*/ 2 3 #undef __FUNCT__ 4 #define __FUNCT__ "TSEventInitialize" 5 /* 6 TSEventInitialize - Initializes TSEvent for TSSolve 7 */ 8 PetscErrorCode TSEventInitialize(TSEvent event,TS ts,PetscReal t,Vec U) 9 { 10 PetscErrorCode ierr; 11 12 PetscFunctionBegin; 13 if (!event) PetscFunctionReturn(0); 14 PetscValidPointer(event,1); 15 PetscValidHeaderSpecific(ts,TS_CLASSID,2); 16 PetscValidHeaderSpecific(U,VEC_CLASSID,4); 17 event->ptime_prev = t; 18 event->iterctr = 0; 19 ierr = (*event->eventhandler)(ts,t,U,event->fvalue_prev,event->ctx);CHKERRQ(ierr); 20 /* Initialize the event recorder */ 21 event->recorder.ctr = 0; 22 PetscFunctionReturn(0); 23 } 24 25 #undef __FUNCT__ 26 #define __FUNCT__ "TSEventDestroy" 27 PetscErrorCode TSEventDestroy(TSEvent *event) 28 { 29 PetscErrorCode ierr; 30 PetscInt i; 31 32 PetscFunctionBegin; 33 PetscValidPointer(event,1); 34 if (!*event) PetscFunctionReturn(0); 35 ierr = PetscFree((*event)->fvalue);CHKERRQ(ierr); 36 ierr = PetscFree((*event)->fvalue_prev);CHKERRQ(ierr); 37 ierr = PetscFree((*event)->fvalue_right);CHKERRQ(ierr); 38 ierr = PetscFree((*event)->zerocrossing);CHKERRQ(ierr); 39 ierr = PetscFree((*event)->side);CHKERRQ(ierr); 40 ierr = PetscFree((*event)->direction);CHKERRQ(ierr); 41 ierr = PetscFree((*event)->terminate);CHKERRQ(ierr); 42 ierr = PetscFree((*event)->events_zero);CHKERRQ(ierr); 43 ierr = PetscFree((*event)->vtol);CHKERRQ(ierr); 44 45 for (i=0; i < (*event)->recsize; i++) { 46 ierr = PetscFree((*event)->recorder.eventidx[i]);CHKERRQ(ierr); 47 } 48 ierr = PetscFree((*event)->recorder.eventidx);CHKERRQ(ierr); 49 ierr = PetscFree((*event)->recorder.nevents);CHKERRQ(ierr); 50 ierr = PetscFree((*event)->recorder.stepnum);CHKERRQ(ierr); 51 ierr = PetscFree((*event)->recorder.time);CHKERRQ(ierr); 52 53 ierr = PetscViewerDestroy(&(*event)->monitor);CHKERRQ(ierr); 54 ierr = PetscFree(*event);CHKERRQ(ierr); 55 PetscFunctionReturn(0); 56 } 57 58 #undef __FUNCT__ 59 #define __FUNCT__ "TSSetEventTolerances" 60 /*@ 61 TSSetEventTolerances - Set tolerances for event zero crossings when using event handler 62 63 Logically Collective 64 65 Input Arguments: 66 + ts - time integration context 67 . tol - scalar tolerance, PETSC_DECIDE to leave current value 68 - vtol - array of tolerances or NULL, used in preference to tol if present 69 70 Options Database Keys: 71 . -ts_event_tol <tol> tolerance for event zero crossing 72 73 Notes: 74 Must call TSSetEventHandler() before setting the tolerances. 75 76 The size of vtol is equal to the number of events. 77 78 Level: beginner 79 80 .seealso: TS, TSEvent, TSSetEventHandler() 81 @*/ 82 PetscErrorCode TSSetEventTolerances(TS ts,PetscReal tol,PetscReal vtol[]) 83 { 84 TSEvent event; 85 PetscInt i; 86 87 PetscFunctionBegin; 88 PetscValidHeaderSpecific(ts,TS_CLASSID,1); 89 if (vtol) PetscValidRealPointer(vtol,3); 90 if (!ts->event) SETERRQ(PetscObjectComm((PetscObject)ts),PETSC_ERR_USER,"Must set the events first by calling TSSetEventHandler()"); 91 92 event = ts->event; 93 if (vtol) { 94 for (i=0; i < event->nevents; i++) event->vtol[i] = vtol[i]; 95 } else { 96 if (tol != PETSC_DECIDE || tol != PETSC_DEFAULT) { 97 for (i=0; i < event->nevents; i++) event->vtol[i] = tol; 98 } 99 } 100 PetscFunctionReturn(0); 101 } 102 103 #undef __FUNCT__ 104 #define __FUNCT__ "TSSetEventHandler" 105 /*@C 106 TSSetEventHandler - Sets a monitoring function used for detecting events 107 108 Logically Collective on TS 109 110 Input Parameters: 111 + ts - the TS context obtained from TSCreate() 112 . nevents - number of local events 113 . direction - direction of zero crossing to be detected. -1 => Zero crossing in negative direction, 114 +1 => Zero crossing in positive direction, 0 => both ways (one for each event) 115 . terminate - flag to indicate whether time stepping should be terminated after 116 event is detected (one for each event) 117 . eventhandler - event monitoring routine 118 . postevent - [optional] post-event function 119 - ctx - [optional] user-defined context for private data for the 120 event monitor and post event routine (use NULL if no 121 context is desired) 122 123 Calling sequence of eventhandler: 124 PetscErrorCode EventHandler(TS ts,PetscReal t,Vec U,PetscScalar fvalue[],void* ctx) 125 126 Input Parameters: 127 + ts - the TS context 128 . t - current time 129 . U - current iterate 130 - ctx - [optional] context passed with eventhandler 131 132 Output parameters: 133 . fvalue - function value of events at time t 134 135 Calling sequence of postevent: 136 PetscErrorCode PostEvent(TS ts,PetscInt nevents_zero,PetscInt events_zero[],PetscReal t,Vec U,PetscBool forwardsolve,void* ctx) 137 138 Input Parameters: 139 + ts - the TS context 140 . nevents_zero - number of local events whose event function is zero 141 . events_zero - indices of local events which have reached zero 142 . t - current time 143 . U - current solution 144 . forwardsolve - Flag to indicate whether TS is doing a forward solve (1) or adjoint solve (0) 145 - ctx - the context passed with eventhandler 146 147 Level: intermediate 148 149 .keywords: TS, event, set 150 151 .seealso: TSCreate(), TSSetTimeStep(), TSSetConvergedReason() 152 @*/ 153 PetscErrorCode TSSetEventHandler(TS ts,PetscInt nevents,PetscInt direction[],PetscBool terminate[],PetscErrorCode (*eventhandler)(TS,PetscReal,Vec,PetscScalar[],void*),PetscErrorCode (*postevent)(TS,PetscInt,PetscInt[],PetscReal,Vec,PetscBool,void*),void *ctx) 154 { 155 PetscErrorCode ierr; 156 TSEvent event; 157 PetscInt i; 158 PetscBool flg; 159 #if defined PETSC_USE_REAL_SINGLE 160 PetscReal tol=1e-4; 161 #else 162 PetscReal tol=1e-6; 163 #endif 164 165 PetscFunctionBegin; 166 PetscValidHeaderSpecific(ts,TS_CLASSID,1); 167 PetscValidIntPointer(direction,2); 168 PetscValidIntPointer(terminate,3); 169 170 ierr = PetscNewLog(ts,&event);CHKERRQ(ierr); 171 ierr = PetscMalloc1(nevents,&event->fvalue);CHKERRQ(ierr); 172 ierr = PetscMalloc1(nevents,&event->fvalue_prev);CHKERRQ(ierr); 173 ierr = PetscMalloc1(nevents,&event->fvalue_right);CHKERRQ(ierr); 174 ierr = PetscMalloc1(nevents,&event->zerocrossing);CHKERRQ(ierr); 175 ierr = PetscMalloc1(nevents,&event->side);CHKERRQ(ierr); 176 ierr = PetscMalloc1(nevents,&event->direction);CHKERRQ(ierr); 177 ierr = PetscMalloc1(nevents,&event->terminate);CHKERRQ(ierr); 178 ierr = PetscMalloc1(nevents,&event->vtol);CHKERRQ(ierr); 179 for (i=0; i < nevents; i++) { 180 event->direction[i] = direction[i]; 181 event->terminate[i] = terminate[i]; 182 event->zerocrossing[i] = PETSC_FALSE; 183 event->side[i] = 0; 184 } 185 ierr = PetscMalloc1(nevents,&event->events_zero);CHKERRQ(ierr); 186 event->nevents = nevents; 187 event->eventhandler = eventhandler; 188 event->postevent = postevent; 189 event->ctx = ctx; 190 191 event->recsize = 8; /* Initial size of the recorder */ 192 ierr = PetscOptionsBegin(((PetscObject)ts)->comm,"","TS Event options","");CHKERRQ(ierr); 193 { 194 ierr = PetscOptionsReal("-ts_event_tol","Scalar event tolerance for zero crossing check","TSSetEventTolerances",tol,&tol,NULL);CHKERRQ(ierr); 195 ierr = PetscOptionsName("-ts_event_monitor","Print choices made by event handler","",&flg);CHKERRQ(ierr); 196 ierr = PetscOptionsInt("-ts_event_recorder_initial_size","Initial size of event recorder","",event->recsize,&event->recsize,NULL);CHKERRQ(ierr); 197 } 198 PetscOptionsEnd(); 199 200 ierr = PetscMalloc1(event->recsize,&event->recorder.time);CHKERRQ(ierr); 201 ierr = PetscMalloc1(event->recsize,&event->recorder.stepnum);CHKERRQ(ierr); 202 ierr = PetscMalloc1(event->recsize,&event->recorder.nevents);CHKERRQ(ierr); 203 ierr = PetscMalloc1(event->recsize,&event->recorder.eventidx);CHKERRQ(ierr); 204 for (i=0; i < event->recsize; i++) { 205 ierr = PetscMalloc1(event->nevents,&event->recorder.eventidx[i]);CHKERRQ(ierr); 206 } 207 208 for (i=0; i < event->nevents; i++) event->vtol[i] = tol; 209 if (flg) {ierr = PetscViewerASCIIOpen(PETSC_COMM_SELF,"stdout",&event->monitor);CHKERRQ(ierr);} 210 211 ierr = TSEventDestroy(&ts->event);CHKERRQ(ierr); 212 ts->event = event; 213 PetscFunctionReturn(0); 214 } 215 216 #undef __FUNCT__ 217 #define __FUNCT__ "TSEventRecorderResize" 218 /* 219 TSEventRecorderResize - Resizes (2X) the event recorder arrays whenever the recording limit (event->recsize) 220 is reached. 221 */ 222 static PetscErrorCode TSEventRecorderResize(TSEvent event) 223 { 224 PetscErrorCode ierr; 225 PetscReal *time; 226 PetscInt *stepnum; 227 PetscInt *nevents; 228 PetscInt **eventidx; 229 PetscInt i,fact=2; 230 231 PetscFunctionBegin; 232 233 /* Create large arrays */ 234 ierr = PetscMalloc1(fact*event->recsize,&time);CHKERRQ(ierr); 235 ierr = PetscMalloc1(fact*event->recsize,&stepnum);CHKERRQ(ierr); 236 ierr = PetscMalloc1(fact*event->recsize,&nevents);CHKERRQ(ierr); 237 ierr = PetscMalloc1(fact*event->recsize,&eventidx);CHKERRQ(ierr); 238 for (i=0; i < fact*event->recsize; i++) { 239 ierr = PetscMalloc1(event->nevents,&eventidx[i]);CHKERRQ(ierr); 240 } 241 242 /* Copy over data */ 243 ierr = PetscMemcpy(time,event->recorder.time,event->recsize*sizeof(PetscReal));CHKERRQ(ierr); 244 ierr = PetscMemcpy(stepnum,event->recorder.stepnum,event->recsize*sizeof(PetscInt));CHKERRQ(ierr); 245 ierr = PetscMemcpy(nevents,event->recorder.nevents,event->recsize*sizeof(PetscInt));CHKERRQ(ierr); 246 for (i=0; i < event->recsize; i++) { 247 ierr = PetscMemcpy(eventidx[i],event->recorder.eventidx[i],event->recorder.nevents[i]*sizeof(PetscInt));CHKERRQ(ierr); 248 } 249 250 /* Destroy old arrays */ 251 for (i=0; i < event->recsize; i++) { 252 ierr = PetscFree(event->recorder.eventidx[i]);CHKERRQ(ierr); 253 } 254 ierr = PetscFree(event->recorder.eventidx);CHKERRQ(ierr); 255 ierr = PetscFree(event->recorder.nevents);CHKERRQ(ierr); 256 ierr = PetscFree(event->recorder.stepnum);CHKERRQ(ierr); 257 ierr = PetscFree(event->recorder.time);CHKERRQ(ierr); 258 259 /* Set pointers */ 260 event->recorder.time = time; 261 event->recorder.stepnum = stepnum; 262 event->recorder.nevents = nevents; 263 event->recorder.eventidx = eventidx; 264 265 /* Double size */ 266 event->recsize *= fact; 267 268 PetscFunctionReturn(0); 269 } 270 271 /* 272 Helper rutine to handle user postenvents and recording 273 */ 274 #undef __FUNCT__ 275 #define __FUNCT__ "TSPostEvent" 276 static PetscErrorCode TSPostEvent(TS ts,PetscReal t,Vec U) 277 { 278 PetscErrorCode ierr; 279 TSEvent event = ts->event; 280 PetscBool terminate = PETSC_FALSE; 281 PetscBool restart = PETSC_FALSE; 282 PetscInt i,ctr,stepnum; 283 PetscBool ts_terminate,ts_restart; 284 PetscBool forwardsolve = PETSC_TRUE; /* Flag indicating that TS is doing a forward solve */ 285 286 PetscFunctionBegin; 287 if (event->postevent) { 288 PetscObjectState state_prev,state_post; 289 ierr = PetscObjectStateGet((PetscObject)U,&state_prev);CHKERRQ(ierr); 290 ierr = (*event->postevent)(ts,event->nevents_zero,event->events_zero,t,U,forwardsolve,event->ctx);CHKERRQ(ierr); 291 ierr = PetscObjectStateGet((PetscObject)U,&state_post);CHKERRQ(ierr); 292 if (state_prev != state_post) restart = PETSC_TRUE; 293 } 294 295 /* Handle termination events and step restart */ 296 for (i=0; i<event->nevents_zero; i++) if (event->terminate[event->events_zero[i]]) terminate = PETSC_TRUE; 297 ierr = MPIU_Allreduce(&terminate,&ts_terminate,1,MPIU_BOOL,MPI_LOR,((PetscObject)ts)->comm);CHKERRQ(ierr); 298 if (ts_terminate) {ierr = TSSetConvergedReason(ts,TS_CONVERGED_EVENT);CHKERRQ(ierr);} 299 event->status = ts_terminate ? TSEVENT_NONE : TSEVENT_RESET_NEXTSTEP; 300 ierr = MPIU_Allreduce(&restart,&ts_restart,1,MPIU_BOOL,MPI_LOR,((PetscObject)ts)->comm);CHKERRQ(ierr); 301 if (ts_restart) ts->steprestart = PETSC_TRUE; 302 303 event->ptime_prev = t; 304 /* Reset event residual functions as states might get changed by the postevent callback */ 305 if (event->postevent) {ierr = (*event->eventhandler)(ts,t,U,event->fvalue,event->ctx);CHKERRQ(ierr);} 306 /* Cache current event residual functions */ 307 for (i=0; i < event->nevents; i++) event->fvalue_prev[i] = event->fvalue[i]; 308 309 /* Record the event in the event recorder */ 310 ierr = TSGetTimeStepNumber(ts,&stepnum);CHKERRQ(ierr); 311 ctr = event->recorder.ctr; 312 if (ctr == event->recsize) { 313 ierr = TSEventRecorderResize(event);CHKERRQ(ierr); 314 } 315 event->recorder.time[ctr] = t; 316 event->recorder.stepnum[ctr] = stepnum; 317 event->recorder.nevents[ctr] = event->nevents_zero; 318 for (i=0; i<event->nevents_zero; i++) event->recorder.eventidx[ctr][i] = event->events_zero[i]; 319 event->recorder.ctr++; 320 PetscFunctionReturn(0); 321 } 322 323 /* Uses Anderson-Bjorck variant of regula falsi method */ 324 PETSC_STATIC_INLINE PetscReal TSEventComputeStepSize(PetscReal tleft,PetscReal t,PetscReal tright,PetscScalar fleft,PetscScalar f,PetscScalar fright,PetscInt side,PetscReal dt) 325 { 326 PetscReal new_dt, scal = 1.0; 327 if (PetscRealPart(fleft)*PetscRealPart(f) < 0) { 328 if (side == 1) { 329 scal = (PetscRealPart(fright) - PetscRealPart(f))/PetscRealPart(fright); 330 if (scal < PETSC_SMALL) scal = 0.5; 331 } 332 new_dt = (scal*PetscRealPart(fleft)*t - PetscRealPart(f)*tleft)/(scal*PetscRealPart(fleft) - PetscRealPart(f)) - tleft; 333 } else { 334 if (side == -1) { 335 scal = (PetscRealPart(fleft) - PetscRealPart(f))/PetscRealPart(fleft); 336 if (scal < PETSC_SMALL) scal = 0.5; 337 } 338 new_dt = (PetscRealPart(f)*tright - scal*PetscRealPart(fright)*t)/(PetscRealPart(f) - scal*PetscRealPart(fright)) - t; 339 } 340 return PetscMin(dt,new_dt); 341 } 342 343 344 #undef __FUNCT__ 345 #define __FUNCT__ "TSEventHandler" 346 PetscErrorCode TSEventHandler(TS ts) 347 { 348 PetscErrorCode ierr; 349 TSEvent event; 350 PetscReal t; 351 Vec U; 352 PetscInt i; 353 PetscReal dt,dt_min; 354 PetscInt rollback=0,in[2],out[2]; 355 PetscInt fvalue_sign,fvalueprev_sign; 356 357 PetscFunctionBegin; 358 PetscValidHeaderSpecific(ts,TS_CLASSID,1); 359 if (!ts->event) PetscFunctionReturn(0); 360 event = ts->event; 361 362 ierr = TSGetTime(ts,&t);CHKERRQ(ierr); 363 ierr = TSGetTimeStep(ts,&dt);CHKERRQ(ierr); 364 ierr = TSGetSolution(ts,&U);CHKERRQ(ierr); 365 366 if (event->status == TSEVENT_NONE) { 367 if (ts->steps == 1) /* After first successful step */ 368 event->timestep_orig = ts->ptime - ts->ptime_prev; 369 event->timestep_prev = dt; 370 } 371 372 if (event->status == TSEVENT_RESET_NEXTSTEP) { 373 /* Restore time step */ 374 dt = PetscMin(event->timestep_orig,event->timestep_prev); 375 ierr = TSSetTimeStep(ts,dt);CHKERRQ(ierr); 376 event->status = TSEVENT_NONE; 377 } 378 379 if (event->status == TSEVENT_NONE) { 380 event->ptime_end = t; 381 } 382 383 ierr = (*event->eventhandler)(ts,t,U,event->fvalue,event->ctx);CHKERRQ(ierr); 384 385 for (i=0; i < event->nevents; i++) { 386 if (PetscAbsScalar(event->fvalue[i]) < event->vtol[i]) { 387 event->status = TSEVENT_ZERO; 388 event->fvalue_right[i] = event->fvalue[i]; 389 continue; 390 } 391 fvalue_sign = PetscSign(PetscRealPart(event->fvalue[i])); 392 fvalueprev_sign = PetscSign(PetscRealPart(event->fvalue_prev[i])); 393 if (fvalueprev_sign != 0 && (fvalue_sign != fvalueprev_sign) && (PetscAbsScalar(event->fvalue_prev[i]) > event->vtol[i])) { 394 switch (event->direction[i]) { 395 case -1: 396 if (fvalue_sign < 0) { 397 rollback = 1; 398 399 /* Compute new time step */ 400 dt = TSEventComputeStepSize(event->ptime_prev,t,event->ptime_right,event->fvalue_prev[i],event->fvalue[i],event->fvalue_right[i],event->side[i],dt); 401 402 if (event->monitor) { 403 ierr = PetscViewerASCIIPrintf(event->monitor,"TSEvent: iter %D - Event %D interval detected [%g - %g]\n",event->iterctr,i,(double)event->ptime_prev,(double)t);CHKERRQ(ierr); 404 } 405 event->fvalue_right[i] = event->fvalue[i]; 406 event->side[i] = 1; 407 408 if (!event->iterctr) event->zerocrossing[i] = PETSC_TRUE; 409 event->status = TSEVENT_LOCATED_INTERVAL; 410 } 411 break; 412 case 1: 413 if (fvalue_sign > 0) { 414 rollback = 1; 415 416 /* Compute new time step */ 417 dt = TSEventComputeStepSize(event->ptime_prev,t,event->ptime_right,event->fvalue_prev[i],event->fvalue[i],event->fvalue_right[i],event->side[i],dt); 418 419 if (event->monitor) { 420 ierr = PetscViewerASCIIPrintf(event->monitor,"TSEvent: iter %D - Event %D interval detected [%g - %g]\n",event->iterctr,i,(double)event->ptime_prev,(double)t);CHKERRQ(ierr); 421 } 422 event->fvalue_right[i] = event->fvalue[i]; 423 event->side[i] = 1; 424 425 if (!event->iterctr) event->zerocrossing[i] = PETSC_TRUE; 426 event->status = TSEVENT_LOCATED_INTERVAL; 427 } 428 break; 429 case 0: 430 rollback = 1; 431 432 /* Compute new time step */ 433 dt = TSEventComputeStepSize(event->ptime_prev,t,event->ptime_right,event->fvalue_prev[i],event->fvalue[i],event->fvalue_right[i],event->side[i],dt); 434 435 if (event->monitor) { 436 ierr = PetscViewerASCIIPrintf(event->monitor,"TSEvent: iter %D - Event %D interval detected [%g - %g]\n",event->iterctr,i,(double)event->ptime_prev,(double)t);CHKERRQ(ierr); 437 } 438 event->fvalue_right[i] = event->fvalue[i]; 439 event->side[i] = 1; 440 441 if (!event->iterctr) event->zerocrossing[i] = PETSC_TRUE; 442 event->status = TSEVENT_LOCATED_INTERVAL; 443 444 break; 445 } 446 } 447 } 448 449 in[0] = event->status; in[1] = rollback; 450 ierr = MPIU_Allreduce(in,out,2,MPIU_INT,MPI_MAX,PetscObjectComm((PetscObject)ts));CHKERRQ(ierr); 451 event->status = (TSEventStatus)out[0]; rollback = out[1]; 452 if (rollback) event->status = TSEVENT_LOCATED_INTERVAL; 453 454 event->nevents_zero = 0; 455 if (event->status == TSEVENT_ZERO) { 456 for (i=0; i < event->nevents; i++) { 457 if (PetscAbsScalar(event->fvalue[i]) < event->vtol[i]) { 458 event->events_zero[event->nevents_zero++] = i; 459 if (event->monitor) { 460 ierr = PetscViewerASCIIPrintf(event->monitor,"TSEvent: Event %D zero crossing at time %g located in %D iterations\n",i,(double)t,event->iterctr);CHKERRQ(ierr); 461 } 462 event->zerocrossing[i] = PETSC_FALSE; 463 } 464 event->side[i] = 0; 465 } 466 ierr = TSPostEvent(ts,t,U);CHKERRQ(ierr); 467 468 dt = event->ptime_end - t; 469 if (PetscAbsReal(dt) < PETSC_SMALL) dt += PetscMin(event->timestep_orig,event->timestep_prev); /* XXX Should be done better */ 470 ierr = TSSetTimeStep(ts,dt);CHKERRQ(ierr); 471 event->iterctr = 0; 472 PetscFunctionReturn(0); 473 } 474 475 if (event->status == TSEVENT_LOCATED_INTERVAL) { 476 ierr = TSRollBack(ts);CHKERRQ(ierr); 477 ierr = TSSetConvergedReason(ts,TS_CONVERGED_ITERATING);CHKERRQ(ierr); 478 event->status = TSEVENT_PROCESSING; 479 event->ptime_right = t; 480 } else { 481 for (i=0; i < event->nevents; i++) { 482 if (event->status == TSEVENT_PROCESSING && event->zerocrossing[i]) { 483 /* Compute new time step */ 484 dt = TSEventComputeStepSize(event->ptime_prev,t,event->ptime_right,event->fvalue_prev[i],event->fvalue[i],event->fvalue_right[i],event->side[i],dt); 485 event->side[i] = -1; 486 } 487 event->fvalue_prev[i] = event->fvalue[i]; 488 } 489 if (event->monitor && event->status == TSEVENT_PROCESSING) { 490 ierr = PetscViewerASCIIPrintf(event->monitor,"TSEvent: iter %D - Stepping forward as no event detected in interval [%g - %g]\n",event->iterctr,(double)event->ptime_prev,(double)t);CHKERRQ(ierr); 491 } 492 event->ptime_prev = t; 493 } 494 495 if (event->status == TSEVENT_PROCESSING) event->iterctr++; 496 497 ierr = MPIU_Allreduce(&dt,&dt_min,1,MPIU_REAL,MPIU_MIN,PetscObjectComm((PetscObject)ts));CHKERRQ(ierr); 498 ierr = TSSetTimeStep(ts,dt_min);CHKERRQ(ierr); 499 PetscFunctionReturn(0); 500 } 501 502 #undef __FUNCT__ 503 #define __FUNCT__ "TSAdjointEventHandler" 504 PetscErrorCode TSAdjointEventHandler(TS ts) 505 { 506 PetscErrorCode ierr; 507 TSEvent event; 508 PetscReal t; 509 Vec U; 510 PetscInt ctr; 511 PetscBool forwardsolve=PETSC_FALSE; /* Flag indicating that TS is doing an adjoint solve */ 512 513 PetscFunctionBegin; 514 PetscValidHeaderSpecific(ts,TS_CLASSID,1); 515 if (!ts->event) PetscFunctionReturn(0); 516 event = ts->event; 517 518 ierr = TSGetTime(ts,&t);CHKERRQ(ierr); 519 ierr = TSGetSolution(ts,&U);CHKERRQ(ierr); 520 521 ctr = event->recorder.ctr-1; 522 if (ctr >= 0 && PetscAbsReal(t - event->recorder.time[ctr]) < PETSC_SMALL) { 523 /* Call the user postevent function */ 524 if (event->postevent) { 525 ierr = (*event->postevent)(ts,event->recorder.nevents[ctr],event->recorder.eventidx[ctr],t,U,forwardsolve,event->ctx);CHKERRQ(ierr); 526 event->recorder.ctr--; 527 } 528 } 529 530 PetscBarrier((PetscObject)ts); 531 PetscFunctionReturn(0); 532 } 533