Actual source code: gladapt.c

petsc-3.6.1 2015-07-22
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  2: #include <../src/ts/impls/implicit/gl/gl.h> /*I  "petscts.h" I*/

  4: static PetscFunctionList TSGLAdaptList;
  5: static PetscBool         TSGLAdaptPackageInitialized;
  6: static PetscBool         TSGLAdaptRegisterAllCalled;
  7: static PetscClassId      TSGLADAPT_CLASSID;

  9: struct _TSGLAdaptOps {
 10:   PetscErrorCode (*choose)(TSGLAdapt,PetscInt,const PetscInt[],const PetscReal[],const PetscReal[],PetscInt,PetscReal,PetscReal,PetscInt*,PetscReal*,PetscBool*);
 11:   PetscErrorCode (*destroy)(TSGLAdapt);
 12:   PetscErrorCode (*view)(TSGLAdapt,PetscViewer);
 13:   PetscErrorCode (*setfromoptions)(PetscOptions*,TSGLAdapt);
 14: };

 16: struct _p_TSGLAdapt {
 17:   PETSCHEADER(struct _TSGLAdaptOps);
 18:   void *data;
 19: };

 21: PETSC_EXTERN PetscErrorCode TSGLAdaptCreate_None(TSGLAdapt);
 22: PETSC_EXTERN PetscErrorCode TSGLAdaptCreate_Size(TSGLAdapt);
 23: PETSC_EXTERN PetscErrorCode TSGLAdaptCreate_Both(TSGLAdapt);

 27: /*@C
 28:    TSGLAdaptRegister -  adds a TSGLAdapt implementation

 30:    Not Collective

 32:    Input Parameters:
 33: +  name_scheme - name of user-defined adaptivity scheme
 34: -  routine_create - routine to create method context

 36:    Notes:
 37:    TSGLAdaptRegister() may be called multiple times to add several user-defined families.

 39:    Sample usage:
 40: .vb
 41:    TSGLAdaptRegister("my_scheme",MySchemeCreate);
 42: .ve

 44:    Then, your scheme can be chosen with the procedural interface via
 45: $     TSGLAdaptSetType(ts,"my_scheme")
 46:    or at runtime via the option
 47: $     -ts_adapt_type my_scheme

 49:    Level: advanced

 51: .keywords: TSGLAdapt, register

 53: .seealso: TSGLAdaptRegisterAll()
 54: @*/
 55: PetscErrorCode  TSGLAdaptRegister(const char sname[],PetscErrorCode (*function)(TSGLAdapt))
 56: {

 60:   PetscFunctionListAdd(&TSGLAdaptList,sname,function);
 61:   return(0);
 62: }

 66: /*@C
 67:   TSGLAdaptRegisterAll - Registers all of the adaptivity schemes in TSGLAdapt

 69:   Not Collective

 71:   Level: advanced

 73: .keywords: TSGLAdapt, register, all

 75: .seealso: TSGLAdaptRegisterDestroy()
 76: @*/
 77: PetscErrorCode  TSGLAdaptRegisterAll(void)
 78: {

 82:   if (TSGLAdaptRegisterAllCalled) return(0);
 83:   TSGLAdaptRegisterAllCalled = PETSC_TRUE;
 84:   TSGLAdaptRegister(TSGLADAPT_NONE,TSGLAdaptCreate_None);
 85:   TSGLAdaptRegister(TSGLADAPT_SIZE,TSGLAdaptCreate_Size);
 86:   TSGLAdaptRegister(TSGLADAPT_BOTH,TSGLAdaptCreate_Both);
 87:   return(0);
 88: }

 92: /*@C
 93:   TSGLFinalizePackage - This function destroys everything in the TSGL package. It is
 94:   called from PetscFinalize().

 96:   Level: developer

 98: .keywords: Petsc, destroy, package
 99: .seealso: PetscFinalize()
100: @*/
101: PetscErrorCode  TSGLAdaptFinalizePackage(void)
102: {

106:   PetscFunctionListDestroy(&TSGLAdaptList);
107:   TSGLAdaptPackageInitialized = PETSC_FALSE;
108:   TSGLAdaptRegisterAllCalled  = PETSC_FALSE;
109:   return(0);
110: }

114: /*@C
115:   TSGLAdaptInitializePackage - This function initializes everything in the TSGLAdapt package. It is
116:   called from PetscDLLibraryRegister() when using dynamic libraries, and on the first call to
117:   TSCreate_GL() when using static libraries.

119:   Level: developer

121: .keywords: TSGLAdapt, initialize, package
122: .seealso: PetscInitialize()
123: @*/
124: PetscErrorCode  TSGLAdaptInitializePackage(void)
125: {

129:   if (TSGLAdaptPackageInitialized) return(0);
130:   TSGLAdaptPackageInitialized = PETSC_TRUE;
131:   PetscClassIdRegister("TSGLAdapt",&TSGLADAPT_CLASSID);
132:   TSGLAdaptRegisterAll();
133:   PetscRegisterFinalize(TSGLAdaptFinalizePackage);
134:   return(0);
135: }

139: PetscErrorCode  TSGLAdaptSetType(TSGLAdapt adapt,TSGLAdaptType type)
140: {
141:   PetscErrorCode ierr,(*r)(TSGLAdapt);

144:   PetscFunctionListFind(TSGLAdaptList,type,&r);
145:   if (!r) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_UNKNOWN_TYPE,"Unknown TSGLAdapt type \"%s\" given",type);
146:   if (((PetscObject)adapt)->type_name) {(*adapt->ops->destroy)(adapt);}
147:   (*r)(adapt);
148:   PetscObjectChangeTypeName((PetscObject)adapt,type);
149:   return(0);
150: }

154: PetscErrorCode  TSGLAdaptSetOptionsPrefix(TSGLAdapt adapt,const char prefix[])
155: {

159:   PetscObjectSetOptionsPrefix((PetscObject)adapt,prefix);
160:   return(0);
161: }

165: PetscErrorCode  TSGLAdaptView(TSGLAdapt adapt,PetscViewer viewer)
166: {
168:   PetscBool      iascii;

171:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);
172:   if (iascii) {
173:     PetscObjectPrintClassNamePrefixType((PetscObject)adapt,viewer);
174:     if (adapt->ops->view) {
175:       PetscViewerASCIIPushTab(viewer);
176:       (*adapt->ops->view)(adapt,viewer);
177:       PetscViewerASCIIPopTab(viewer);
178:     }
179:   }
180:   return(0);
181: }

185: PetscErrorCode  TSGLAdaptDestroy(TSGLAdapt *adapt)
186: {

190:   if (!*adapt) return(0);
192:   if (--((PetscObject)(*adapt))->refct > 0) {*adapt = 0; return(0);}
193:   if ((*adapt)->ops->destroy) {(*(*adapt)->ops->destroy)(*adapt);}
194:   PetscHeaderDestroy(adapt);
195:   return(0);
196: }

200: PetscErrorCode  TSGLAdaptSetFromOptions(PetscOptions *PetscOptionsObject,TSGLAdapt adapt)
201: {
203:   char           type[256] = TSGLADAPT_BOTH;
204:   PetscBool      flg;

207:   /* This should use PetscOptionsBegin() if/when this becomes an object used outside of TSGL, but currently this
208:   * function can only be called from inside TSSetFromOptions_GL()  */
209:   PetscOptionsHead(PetscOptionsObject,"TSGL Adaptivity options");
210:   PetscOptionsFList("-ts_adapt_type","Algorithm to use for adaptivity","TSGLAdaptSetType",TSGLAdaptList,
211:                           ((PetscObject)adapt)->type_name ? ((PetscObject)adapt)->type_name : type,type,sizeof(type),&flg);
212:   if (flg || !((PetscObject)adapt)->type_name) {
213:     TSGLAdaptSetType(adapt,type);
214:   }
215:   if (adapt->ops->setfromoptions) {(*adapt->ops->setfromoptions)(PetscOptionsObject,adapt);}
216:   PetscOptionsTail();
217:   return(0);
218: }

222: PetscErrorCode  TSGLAdaptChoose(TSGLAdapt adapt,PetscInt n,const PetscInt orders[],const PetscReal errors[],const PetscReal cost[],PetscInt cur,PetscReal h,PetscReal tleft,PetscInt *next_sc,PetscReal *next_h,PetscBool  *finish)
223: {

234:   (*adapt->ops->choose)(adapt,n,orders,errors,cost,cur,h,tleft,next_sc,next_h,finish);
235:   return(0);
236: }

240: PetscErrorCode  TSGLAdaptCreate(MPI_Comm comm,TSGLAdapt *inadapt)
241: {
243:   TSGLAdapt      adapt;

246:   *inadapt = NULL;
247:   PetscHeaderCreate(adapt,TSGLADAPT_CLASSID,"TSGLAdapt","General Linear adaptivity","TS",comm,TSGLAdaptDestroy,TSGLAdaptView);
248:   *inadapt = adapt;
249:   return(0);
250: }


253: /*
254: *  Implementations
255: */

259: static PetscErrorCode TSGLAdaptDestroy_JustFree(TSGLAdapt adapt)
260: {

264:   PetscFree(adapt->data);
265:   return(0);
266: }

268: /* -------------------------------- None ----------------------------------- */
269: typedef struct {
270:   PetscInt  scheme;
271:   PetscReal h;
272: } TSGLAdapt_None;

276: static PetscErrorCode TSGLAdaptChoose_None(TSGLAdapt adapt,PetscInt n,const PetscInt orders[],const PetscReal errors[],const PetscReal cost[],PetscInt cur,PetscReal h,PetscReal tleft,PetscInt *next_sc,PetscReal *next_h,PetscBool  *finish)
277: {

280:   *next_sc = cur;
281:   *next_h  = h;
282:   if (*next_h > tleft) {
283:     *finish = PETSC_TRUE;
284:     *next_h = tleft;
285:   } else *finish = PETSC_FALSE;
286:   return(0);
287: }

291: PetscErrorCode  TSGLAdaptCreate_None(TSGLAdapt adapt)
292: {
294:   TSGLAdapt_None *a;

297:   PetscNewLog(adapt,&a);
298:   adapt->data         = (void*)a;
299:   adapt->ops->choose  = TSGLAdaptChoose_None;
300:   adapt->ops->destroy = TSGLAdaptDestroy_JustFree;
301:   return(0);
302: }

304: /* -------------------------------- Size ----------------------------------- */
305: typedef struct {
306:   PetscReal desired_h;
307: } TSGLAdapt_Size;


312: static PetscErrorCode TSGLAdaptChoose_Size(TSGLAdapt adapt,PetscInt n,const PetscInt orders[],const PetscReal errors[],const PetscReal cost[],PetscInt cur,PetscReal h,PetscReal tleft,PetscInt *next_sc,PetscReal *next_h,PetscBool  *finish)
313: {
314:   TSGLAdapt_Size *sz = (TSGLAdapt_Size*)adapt->data;
315:   PetscReal      dec = 0.2,inc = 5.0,safe = 0.9,optimal,last_desired_h;

318:   *next_sc = cur;
319:   optimal  = PetscPowReal((PetscReal)errors[cur],(PetscReal)-1./(safe*orders[cur]));
320:   /* Step sizes oscillate when there is no smoothing.  Here we use a geometric mean of the current step size and the
321:   * one that would have been taken (without smoothing) on the last step. */
322:   last_desired_h = sz->desired_h;
323:   sz->desired_h  = h*PetscMax(dec,PetscMin(inc,optimal)); /* Trim to [dec,inc] */

325:   /* Normally only happens on the first step */
326:   if (last_desired_h > 1e-14) *next_h = PetscSqrtReal(last_desired_h * sz->desired_h);
327:   else *next_h = sz->desired_h;

329:   if (*next_h > tleft) {
330:     *finish = PETSC_TRUE;
331:     *next_h = tleft;
332:   } else *finish = PETSC_FALSE;
333:   return(0);
334: }

338: PetscErrorCode  TSGLAdaptCreate_Size(TSGLAdapt adapt)
339: {
341:   TSGLAdapt_Size *a;

344:   PetscNewLog(adapt,&a);
345:   adapt->data         = (void*)a;
346:   adapt->ops->choose  = TSGLAdaptChoose_Size;
347:   adapt->ops->destroy = TSGLAdaptDestroy_JustFree;
348:   return(0);
349: }

351: /* -------------------------------- Both ----------------------------------- */
352: typedef struct {
353:   PetscInt  count_at_order;
354:   PetscReal desired_h;
355: } TSGLAdapt_Both;


360: static PetscErrorCode TSGLAdaptChoose_Both(TSGLAdapt adapt,PetscInt n,const PetscInt orders[],const PetscReal errors[],const PetscReal cost[],PetscInt cur,PetscReal h,PetscReal tleft,PetscInt *next_sc,PetscReal *next_h,PetscBool  *finish)
361: {
362:   TSGLAdapt_Both *both = (TSGLAdapt_Both*)adapt->data;
364:   PetscReal      dec = 0.2,inc = 5.0,safe = 0.9;
365:   struct {PetscInt id; PetscReal h,eff;} best={-1,0,0},trial={-1,0,0},current={-1,0,0};
366:   PetscInt i;

369:   for (i=0; i<n; i++) {
370:     PetscReal optimal;
371:     trial.id  = i;
372:     optimal   = PetscPowReal((PetscReal)errors[i],(PetscReal)-1./(safe*orders[i]));
373:     trial.h   = h*optimal;
374:     trial.eff = trial.h/cost[i];
375:     if (trial.eff > best.eff) {PetscMemcpy(&best,&trial,sizeof(trial));}
376:     if (i == cur) {PetscMemcpy(&current,&trial,sizeof(trial));}
377:   }
378:   /* Only switch orders if the scheme offers significant benefits over the current one.
379:   When the scheme is not changing, only change step size if it offers significant benefits. */
380:   if (best.eff < 1.2*current.eff || both->count_at_order < orders[cur]+2) {
381:     PetscReal last_desired_h;
382:     *next_sc        = current.id;
383:     last_desired_h  = both->desired_h;
384:     both->desired_h = PetscMax(h*dec,PetscMin(h*inc,current.h));
385:     *next_h         = (both->count_at_order > 0)
386:                       ? PetscSqrtReal(last_desired_h * both->desired_h)
387:                       : both->desired_h;
388:     both->count_at_order++;
389:   } else {
390:     PetscReal rat = cost[best.id]/cost[cur];
391:     *next_sc = best.id;
392:     *next_h  = PetscMax(h*rat*dec,PetscMin(h*rat*inc,best.h));
393:     both->count_at_order = 0;
394:     both->desired_h      = best.h;
395:   }

397:   if (*next_h > tleft) {
398:     *finish = PETSC_TRUE;
399:     *next_h = tleft;
400:   } else *finish = PETSC_FALSE;
401:   return(0);
402: }

406: PetscErrorCode TSGLAdaptCreate_Both(TSGLAdapt adapt)
407: {
409:   TSGLAdapt_Both *a;

412:   PetscNewLog(adapt,&a);
413:   adapt->data         = (void*)a;
414:   adapt->ops->choose  = TSGLAdaptChoose_Both;
415:   adapt->ops->destroy = TSGLAdaptDestroy_JustFree;
416:   return(0);
417: }