1 /* Defines the basic SNES object */ 2 #include <../src/snes/impls/fas/fasimpls.h> /*I "petscsnes.h" I*/ 3 4 const char *const SNESFASTypes[] = {"MULTIPLICATIVE","ADDITIVE","FULL","KASKADE","SNESFASType","SNES_FAS",0}; 5 6 extern PetscErrorCode SNESDestroy_FAS(SNES snes); 7 extern PetscErrorCode SNESSetUp_FAS(SNES snes); 8 extern PetscErrorCode SNESSetFromOptions_FAS(SNES snes); 9 extern PetscErrorCode SNESView_FAS(SNES snes, PetscViewer viewer); 10 extern PetscErrorCode SNESSolve_FAS(SNES snes); 11 extern PetscErrorCode SNESReset_FAS(SNES snes); 12 extern PetscErrorCode SNESFASGalerkinDefaultFunction(SNES, Vec, Vec, void*); 13 extern PetscErrorCode SNESFASCycleCreateSmoother_Private(SNES, SNES*); 14 15 /*MC 16 17 SNESFAS - Full Approximation Scheme nonlinear multigrid solver. 18 19 The nonlinear problem is solved by correction using coarse versions 20 of the nonlinear problem. This problem is perturbed so that a projected 21 solution of the fine problem elicits no correction from the coarse problem. 22 23 Options Database: 24 + -snes_fas_levels - The number of levels 25 . -snes_fas_cycles<1> - The number of cycles -- 1 for V, 2 for W 26 . -snes_fas_type<additive,multiplicative,full,kaskade> - Additive or multiplicative cycle 27 . -snes_fas_galerkin<PETSC_FALSE> - Form coarse problems by projection back upon the fine problem 28 . -snes_fas_smoothup<1> - The number of iterations of the post-smoother 29 . -snes_fas_smoothdown<1> - The number of iterations of the pre-smoother 30 . -snes_fas_monitor - Monitor progress of all of the levels 31 . -snes_fas_full_downsweepsmooth<PETSC_FALSE> - call the downsmooth on the initial downsweep of full FAS 32 . -fas_levels_snes_ - SNES options for all smoothers 33 . -fas_levels_cycle_snes_ - SNES options for all cycles 34 . -fas_levels_i_snes_ - SNES options for the smoothers on level i 35 . -fas_levels_i_cycle_snes_ - SNES options for the cycle on level i 36 - -fas_coarse_snes_ - SNES options for the coarsest smoother 37 38 Notes: 39 The organization of the FAS solver is slightly different from the organization of PCMG 40 As each level has smoother SNES instances(down and potentially up) and a cycle SNES instance. 41 The cycle SNES instance may be used for monitoring convergence on a particular level. 42 43 Level: beginner 44 45 .seealso: PCMG, SNESCreate(), SNES, SNESSetType(), SNESType (for list of available types) 46 M*/ 47 48 #undef __FUNCT__ 49 #define __FUNCT__ "SNESCreate_FAS" 50 PETSC_EXTERN PetscErrorCode SNESCreate_FAS(SNES snes) 51 { 52 SNES_FAS *fas; 53 PetscErrorCode ierr; 54 55 PetscFunctionBegin; 56 snes->ops->destroy = SNESDestroy_FAS; 57 snes->ops->setup = SNESSetUp_FAS; 58 snes->ops->setfromoptions = SNESSetFromOptions_FAS; 59 snes->ops->view = SNESView_FAS; 60 snes->ops->solve = SNESSolve_FAS; 61 snes->ops->reset = SNESReset_FAS; 62 63 snes->usesksp = PETSC_FALSE; 64 snes->usespc = PETSC_FALSE; 65 66 if (!snes->tolerancesset) { 67 snes->max_funcs = 30000; 68 snes->max_its = 10000; 69 } 70 71 ierr = PetscNewLog(snes,&fas);CHKERRQ(ierr); 72 73 snes->data = (void*) fas; 74 fas->level = 0; 75 fas->levels = 1; 76 fas->n_cycles = 1; 77 fas->max_up_it = 1; 78 fas->max_down_it = 1; 79 fas->smoothu = NULL; 80 fas->smoothd = NULL; 81 fas->next = NULL; 82 fas->previous = NULL; 83 fas->fine = snes; 84 fas->interpolate = NULL; 85 fas->restrct = NULL; 86 fas->inject = NULL; 87 fas->monitor = NULL; 88 fas->usedmfornumberoflevels = PETSC_FALSE; 89 fas->fastype = SNES_FAS_MULTIPLICATIVE; 90 fas->full_downsweep = PETSC_FALSE; 91 92 fas->eventsmoothsetup = 0; 93 fas->eventsmoothsolve = 0; 94 fas->eventresidual = 0; 95 fas->eventinterprestrict = 0; 96 PetscFunctionReturn(0); 97 } 98 99 #undef __FUNCT__ 100 #define __FUNCT__ "SNESReset_FAS" 101 PetscErrorCode SNESReset_FAS(SNES snes) 102 { 103 PetscErrorCode ierr = 0; 104 SNES_FAS * fas = (SNES_FAS*)snes->data; 105 106 PetscFunctionBegin; 107 ierr = SNESDestroy(&fas->smoothu);CHKERRQ(ierr); 108 ierr = SNESDestroy(&fas->smoothd);CHKERRQ(ierr); 109 ierr = MatDestroy(&fas->inject);CHKERRQ(ierr); 110 ierr = MatDestroy(&fas->interpolate);CHKERRQ(ierr); 111 ierr = MatDestroy(&fas->restrct);CHKERRQ(ierr); 112 ierr = VecDestroy(&fas->rscale);CHKERRQ(ierr); 113 if (fas->galerkin) { 114 ierr = VecDestroy(&fas->Xg);CHKERRQ(ierr); 115 ierr = VecDestroy(&fas->Fg);CHKERRQ(ierr); 116 } 117 if (fas->next) {ierr = SNESReset(fas->next);CHKERRQ(ierr);} 118 PetscFunctionReturn(0); 119 } 120 121 #undef __FUNCT__ 122 #define __FUNCT__ "SNESDestroy_FAS" 123 PetscErrorCode SNESDestroy_FAS(SNES snes) 124 { 125 SNES_FAS * fas = (SNES_FAS*)snes->data; 126 PetscErrorCode ierr = 0; 127 128 PetscFunctionBegin; 129 /* recursively resets and then destroys */ 130 ierr = SNESReset(snes);CHKERRQ(ierr); 131 if (fas->next) { 132 ierr = SNESDestroy(&fas->next);CHKERRQ(ierr); 133 } 134 ierr = PetscFree(fas);CHKERRQ(ierr); 135 PetscFunctionReturn(0); 136 } 137 138 #undef __FUNCT__ 139 #define __FUNCT__ "SNESSetUp_FAS" 140 PetscErrorCode SNESSetUp_FAS(SNES snes) 141 { 142 SNES_FAS *fas = (SNES_FAS*) snes->data; 143 PetscErrorCode ierr; 144 VecScatter injscatter; 145 PetscInt dm_levels; 146 Vec vec_sol, vec_func, vec_sol_update, vec_rhs; /* preserve these if they're set through the reset */ 147 SNES next; 148 PetscBool isFine; 149 SNESLineSearch linesearch; 150 SNESLineSearch slinesearch; 151 void *lsprectx,*lspostctx; 152 PetscErrorCode (*precheck)(SNESLineSearch,Vec,Vec,PetscBool*,void*); 153 PetscErrorCode (*postcheck)(SNESLineSearch,Vec,Vec,Vec,PetscBool*,PetscBool*,void*); 154 155 PetscFunctionBegin; 156 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 157 if (fas->usedmfornumberoflevels && isFine) { 158 ierr = DMGetRefineLevel(snes->dm,&dm_levels);CHKERRQ(ierr); 159 dm_levels++; 160 if (dm_levels > fas->levels) { 161 /* we don't want the solution and func vectors to be destroyed in the SNESReset when it's called in SNESFASSetLevels_FAS*/ 162 vec_sol = snes->vec_sol; 163 vec_func = snes->vec_func; 164 vec_sol_update = snes->vec_sol_update; 165 vec_rhs = snes->vec_rhs; 166 snes->vec_sol = NULL; 167 snes->vec_func = NULL; 168 snes->vec_sol_update = NULL; 169 snes->vec_rhs = NULL; 170 171 /* reset the number of levels */ 172 ierr = SNESFASSetLevels(snes,dm_levels,NULL);CHKERRQ(ierr); 173 ierr = SNESSetFromOptions(snes);CHKERRQ(ierr); 174 175 snes->vec_sol = vec_sol; 176 snes->vec_func = vec_func; 177 snes->vec_rhs = vec_rhs; 178 snes->vec_sol_update = vec_sol_update; 179 } 180 } 181 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 182 if (!isFine) snes->gridsequence = 0; /* no grid sequencing inside the multigrid hierarchy! */ 183 184 ierr = SNESSetWorkVecs(snes, 2);CHKERRQ(ierr); /* work vectors used for intergrid transfers */ 185 186 /* set up the smoothers if they haven't already been set up */ 187 if (!fas->smoothd) { 188 ierr = SNESFASCycleCreateSmoother_Private(snes, &fas->smoothd);CHKERRQ(ierr); 189 } 190 191 if (snes->dm) { 192 /* set the smoother DMs properly */ 193 if (fas->smoothu) ierr = SNESSetDM(fas->smoothu, snes->dm);CHKERRQ(ierr); 194 ierr = SNESSetDM(fas->smoothd, snes->dm);CHKERRQ(ierr); 195 /* construct EVERYTHING from the DM -- including the progressive set of smoothers */ 196 if (next) { 197 /* for now -- assume the DM and the evaluation functions have been set externally */ 198 if (!next->dm) { 199 ierr = DMCoarsen(snes->dm, PetscObjectComm((PetscObject)next), &next->dm);CHKERRQ(ierr); 200 ierr = SNESSetDM(next, next->dm);CHKERRQ(ierr); 201 } 202 /* set the interpolation and restriction from the DM */ 203 if (!fas->interpolate) { 204 ierr = DMCreateInterpolation(next->dm, snes->dm, &fas->interpolate, &fas->rscale);CHKERRQ(ierr); 205 if (!fas->restrct) { 206 ierr = PetscObjectReference((PetscObject)fas->interpolate);CHKERRQ(ierr); 207 fas->restrct = fas->interpolate; 208 } 209 } 210 /* set the injection from the DM */ 211 if (!fas->inject) { 212 ierr = DMCreateInjection(next->dm, snes->dm, &fas->inject);CHKERRQ(ierr); 213 } 214 } 215 } 216 /*pass the smoother, function, and jacobian up to the next level if it's not user set already */ 217 if (fas->galerkin) { 218 if (next) { 219 ierr = SNESSetFunction(next, NULL, SNESFASGalerkinDefaultFunction, next);CHKERRQ(ierr); 220 } 221 if (fas->smoothd && fas->level != fas->levels - 1) { 222 ierr = SNESSetFunction(fas->smoothd, NULL, SNESFASGalerkinDefaultFunction, snes);CHKERRQ(ierr); 223 } 224 if (fas->smoothu && fas->level != fas->levels - 1) { 225 ierr = SNESSetFunction(fas->smoothu, NULL, SNESFASGalerkinDefaultFunction, snes);CHKERRQ(ierr); 226 } 227 } 228 229 /* sets the down (pre) smoother's default norm and sets it from options */ 230 if (fas->smoothd) { 231 if (fas->level == 0 && fas->levels != 1) { 232 ierr = SNESSetNormSchedule(fas->smoothd, SNES_NORM_NONE);CHKERRQ(ierr); 233 } else { 234 ierr = SNESSetNormSchedule(fas->smoothd, SNES_NORM_FINAL_ONLY);CHKERRQ(ierr); 235 } 236 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)snes, (PetscObject)fas->smoothd);CHKERRQ(ierr); 237 ierr = SNESSetFromOptions(fas->smoothd);CHKERRQ(ierr); 238 ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr); 239 ierr = SNESGetLineSearch(fas->smoothd,&slinesearch);CHKERRQ(ierr); 240 ierr = SNESLineSearchGetPreCheck(linesearch,&precheck,&lsprectx);CHKERRQ(ierr); 241 ierr = SNESLineSearchGetPostCheck(linesearch,&postcheck,&lspostctx);CHKERRQ(ierr); 242 ierr = SNESLineSearchSetPreCheck(slinesearch,precheck,lsprectx);CHKERRQ(ierr); 243 ierr = SNESLineSearchSetPostCheck(slinesearch,postcheck,lspostctx);CHKERRQ(ierr); 244 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)linesearch, (PetscObject)slinesearch);CHKERRQ(ierr); 245 246 fas->smoothd->vec_sol = snes->vec_sol; 247 ierr = PetscObjectReference((PetscObject)snes->vec_sol);CHKERRQ(ierr); 248 fas->smoothd->vec_sol_update = snes->vec_sol_update; 249 ierr = PetscObjectReference((PetscObject)snes->vec_sol_update);CHKERRQ(ierr); 250 fas->smoothd->vec_func = snes->vec_func; 251 ierr = PetscObjectReference((PetscObject)snes->vec_func);CHKERRQ(ierr); 252 253 if (fas->eventsmoothsetup) {ierr = PetscLogEventBegin(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 254 ierr = SNESSetUp(fas->smoothd);CHKERRQ(ierr); 255 if (fas->eventsmoothsetup) {ierr = PetscLogEventEnd(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 256 } 257 258 /* sets the up (post) smoother's default norm and sets it from options */ 259 if (fas->smoothu) { 260 if (fas->level != fas->levels - 1) { 261 ierr = SNESSetNormSchedule(fas->smoothu, SNES_NORM_NONE);CHKERRQ(ierr); 262 } else { 263 ierr = SNESSetNormSchedule(fas->smoothu, SNES_NORM_FINAL_ONLY);CHKERRQ(ierr); 264 } 265 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)snes, (PetscObject)fas->smoothu);CHKERRQ(ierr); 266 ierr = SNESSetFromOptions(fas->smoothu);CHKERRQ(ierr); 267 ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr); 268 ierr = SNESGetLineSearch(fas->smoothu,&slinesearch);CHKERRQ(ierr); 269 ierr = SNESLineSearchGetPreCheck(linesearch,&precheck,&lsprectx);CHKERRQ(ierr); 270 ierr = SNESLineSearchGetPostCheck(linesearch,&postcheck,&lspostctx);CHKERRQ(ierr); 271 ierr = SNESLineSearchSetPreCheck(slinesearch,precheck,lsprectx);CHKERRQ(ierr); 272 ierr = SNESLineSearchSetPostCheck(slinesearch,postcheck,lspostctx);CHKERRQ(ierr); 273 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)linesearch, (PetscObject)slinesearch);CHKERRQ(ierr); 274 275 fas->smoothu->vec_sol = snes->vec_sol; 276 ierr = PetscObjectReference((PetscObject)snes->vec_sol);CHKERRQ(ierr); 277 fas->smoothu->vec_sol_update = snes->vec_sol_update; 278 ierr = PetscObjectReference((PetscObject)snes->vec_sol_update);CHKERRQ(ierr); 279 fas->smoothu->vec_func = snes->vec_func; 280 ierr = PetscObjectReference((PetscObject)snes->vec_func);CHKERRQ(ierr); 281 282 if (fas->eventsmoothsetup) {ierr = PetscLogEventBegin(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 283 ierr = SNESSetUp(fas->smoothu);CHKERRQ(ierr); 284 if (fas->eventsmoothsetup) {ierr = PetscLogEventEnd(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 285 286 } 287 288 if (next) { 289 /* gotta set up the solution vector for this to work */ 290 if (!next->vec_sol) {ierr = SNESFASCreateCoarseVec(snes,&next->vec_sol);CHKERRQ(ierr);} 291 if (!next->vec_rhs) {ierr = SNESFASCreateCoarseVec(snes,&next->vec_rhs);CHKERRQ(ierr);} 292 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)snes, (PetscObject)next);CHKERRQ(ierr); 293 ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr); 294 ierr = SNESGetLineSearch(fas->next,&slinesearch);CHKERRQ(ierr); 295 ierr = SNESLineSearchGetPreCheck(linesearch,&precheck,&lsprectx);CHKERRQ(ierr); 296 ierr = SNESLineSearchGetPostCheck(linesearch,&postcheck,&lspostctx);CHKERRQ(ierr); 297 ierr = SNESLineSearchSetPreCheck(slinesearch,precheck,lsprectx);CHKERRQ(ierr); 298 ierr = SNESLineSearchSetPostCheck(slinesearch,postcheck,lspostctx);CHKERRQ(ierr); 299 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)linesearch, (PetscObject)slinesearch);CHKERRQ(ierr); 300 ierr = SNESSetUp(next);CHKERRQ(ierr); 301 } 302 /* setup FAS work vectors */ 303 if (fas->galerkin) { 304 ierr = VecDuplicate(snes->vec_sol, &fas->Xg);CHKERRQ(ierr); 305 ierr = VecDuplicate(snes->vec_sol, &fas->Fg);CHKERRQ(ierr); 306 } 307 PetscFunctionReturn(0); 308 } 309 310 #undef __FUNCT__ 311 #define __FUNCT__ "SNESSetFromOptions_FAS" 312 PetscErrorCode SNESSetFromOptions_FAS(SNES snes) 313 { 314 SNES_FAS *fas = (SNES_FAS*) snes->data; 315 PetscInt levels = 1; 316 PetscBool flg = PETSC_FALSE, upflg = PETSC_FALSE, downflg = PETSC_FALSE, monflg = PETSC_FALSE, galerkinflg = PETSC_FALSE,continuationflg = PETSC_FALSE; 317 PetscErrorCode ierr; 318 char monfilename[PETSC_MAX_PATH_LEN]; 319 SNESFASType fastype; 320 const char *optionsprefix; 321 SNESLineSearch linesearch; 322 PetscInt m, n_up, n_down; 323 SNES next; 324 PetscBool isFine; 325 326 PetscFunctionBegin; 327 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 328 ierr = PetscOptionsHead("SNESFAS Options-----------------------------------");CHKERRQ(ierr); 329 330 /* number of levels -- only process most options on the finest level */ 331 if (isFine) { 332 ierr = PetscOptionsInt("-snes_fas_levels", "Number of Levels", "SNESFASSetLevels", levels, &levels, &flg);CHKERRQ(ierr); 333 if (!flg && snes->dm) { 334 ierr = DMGetRefineLevel(snes->dm,&levels);CHKERRQ(ierr); 335 levels++; 336 fas->usedmfornumberoflevels = PETSC_TRUE; 337 } 338 ierr = SNESFASSetLevels(snes, levels, NULL);CHKERRQ(ierr); 339 fastype = fas->fastype; 340 ierr = PetscOptionsEnum("-snes_fas_type","FAS correction type","SNESFASSetType",SNESFASTypes,(PetscEnum)fastype,(PetscEnum*)&fastype,&flg);CHKERRQ(ierr); 341 if (flg) { 342 ierr = SNESFASSetType(snes, fastype);CHKERRQ(ierr); 343 } 344 345 ierr = SNESGetOptionsPrefix(snes, &optionsprefix);CHKERRQ(ierr); 346 ierr = PetscOptionsInt("-snes_fas_cycles","Number of cycles","SNESFASSetCycles",fas->n_cycles,&m,&flg);CHKERRQ(ierr); 347 if (flg) { 348 ierr = SNESFASSetCycles(snes, m);CHKERRQ(ierr); 349 } 350 ierr = PetscOptionsBool("-snes_fas_continuation","Corrected grid-sequence continuation","SNESFASSetContinuation",fas->continuation,&continuationflg,&flg);CHKERRQ(ierr); 351 if (flg) { 352 ierr = SNESFASSetContinuation(snes,continuationflg);CHKERRQ(ierr); 353 } 354 355 ierr = PetscOptionsBool("-snes_fas_galerkin", "Form coarse problems with Galerkin","SNESFASSetGalerkin",fas->galerkin,&galerkinflg,&flg);CHKERRQ(ierr); 356 if (flg) { 357 ierr = SNESFASSetGalerkin(snes, galerkinflg);CHKERRQ(ierr); 358 } 359 360 if (fas->fastype == SNES_FAS_FULL) { 361 ierr = PetscOptionsBool("-snes_fas_full_downsweep","Smooth on the initial upsweep for full FAS cycles","SNESFASFullSetDownSweep",fas->full_downsweep,&fas->full_downsweep,&flg);CHKERRQ(ierr); 362 if (flg) {SNESFASFullSetDownSweep(snes,fas->full_downsweep);CHKERRQ(ierr);} 363 } 364 365 ierr = PetscOptionsInt("-snes_fas_smoothup","Number of post-smoothing steps","SNESFASSetNumberSmoothUp",fas->max_up_it,&n_up,&upflg);CHKERRQ(ierr); 366 367 ierr = PetscOptionsInt("-snes_fas_smoothdown","Number of pre-smoothing steps","SNESFASSetNumberSmoothDown",fas->max_down_it,&n_down,&downflg);CHKERRQ(ierr); 368 369 ierr = PetscOptionsString("-snes_fas_monitor","Monitor FAS progress","SNESFASSetMonitor","stdout",monfilename,PETSC_MAX_PATH_LEN,&monflg);CHKERRQ(ierr); 370 if (monflg) ierr = SNESFASSetMonitor(snes, PETSC_TRUE);CHKERRQ(ierr); 371 372 flg = PETSC_FALSE; 373 monflg = PETSC_TRUE; 374 ierr = PetscOptionsBool("-snes_fas_log","Log times for each FAS level","SNESFASSetLog",monflg,&monflg,&flg);CHKERRQ(ierr); 375 if (flg) {ierr = SNESFASSetLog(snes,monflg);CHKERRQ(ierr);} 376 } 377 378 ierr = PetscOptionsTail();CHKERRQ(ierr); 379 /* setup from the determined types if there is no pointwise procedure or smoother defined */ 380 if (upflg) { 381 ierr = SNESFASSetNumberSmoothUp(snes,n_up);CHKERRQ(ierr); 382 } 383 if (downflg) { 384 ierr = SNESFASSetNumberSmoothDown(snes,n_down);CHKERRQ(ierr); 385 } 386 387 /* set up the default line search for coarse grid corrections */ 388 if (fas->fastype == SNES_FAS_ADDITIVE) { 389 if (!snes->linesearch) { 390 ierr = SNESGetLineSearch(snes, &linesearch);CHKERRQ(ierr); 391 ierr = SNESLineSearchSetType(linesearch, SNESLINESEARCHL2);CHKERRQ(ierr); 392 } 393 } 394 395 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 396 /* recursive option setting for the smoothers */ 397 if (next) {ierr = SNESSetFromOptions(next);CHKERRQ(ierr);} 398 PetscFunctionReturn(0); 399 } 400 401 #include <petscdraw.h> 402 #undef __FUNCT__ 403 #define __FUNCT__ "SNESView_FAS" 404 PetscErrorCode SNESView_FAS(SNES snes, PetscViewer viewer) 405 { 406 SNES_FAS *fas = (SNES_FAS*) snes->data; 407 PetscBool isFine,iascii,isdraw; 408 PetscInt i; 409 PetscErrorCode ierr; 410 SNES smoothu, smoothd, levelsnes; 411 412 PetscFunctionBegin; 413 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 414 if (isFine) { 415 ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr); 416 ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERDRAW,&isdraw);CHKERRQ(ierr); 417 if (iascii) { 418 ierr = PetscViewerASCIIPrintf(viewer, "FAS: type is %s, levels=%D, cycles=%D\n", SNESFASTypes[fas->fastype], fas->levels, fas->n_cycles);CHKERRQ(ierr); 419 if (fas->galerkin) { 420 ierr = PetscViewerASCIIPrintf(viewer," Using Galerkin computed coarse grid function evaluation\n");CHKERRQ(ierr); 421 } else { 422 ierr = PetscViewerASCIIPrintf(viewer," Not using Galerkin computed coarse grid function evaluation\n");CHKERRQ(ierr); 423 } 424 for (i=0; i<fas->levels; i++) { 425 ierr = SNESFASGetCycleSNES(snes, i, &levelsnes);CHKERRQ(ierr); 426 ierr = SNESFASCycleGetSmootherUp(levelsnes, &smoothu);CHKERRQ(ierr); 427 ierr = SNESFASCycleGetSmootherDown(levelsnes, &smoothd);CHKERRQ(ierr); 428 if (!i) { 429 ierr = PetscViewerASCIIPrintf(viewer,"Coarse grid solver -- level %D -------------------------------\n",i);CHKERRQ(ierr); 430 } else { 431 ierr = PetscViewerASCIIPrintf(viewer,"Down solver (pre-smoother) on level %D -------------------------------\n",i);CHKERRQ(ierr); 432 } 433 ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr); 434 if (smoothd) { 435 ierr = SNESView(smoothd,viewer);CHKERRQ(ierr); 436 } else { 437 ierr = PetscViewerASCIIPrintf(viewer,"Not yet available\n");CHKERRQ(ierr); 438 } 439 ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr); 440 if (i && (smoothd == smoothu)) { 441 ierr = PetscViewerASCIIPrintf(viewer,"Up solver (post-smoother) same as down solver (pre-smoother)\n");CHKERRQ(ierr); 442 } else if (i) { 443 ierr = PetscViewerASCIIPrintf(viewer,"Up solver (post-smoother) on level %D -------------------------------\n",i);CHKERRQ(ierr); 444 ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr); 445 if (smoothu) { 446 ierr = SNESView(smoothu,viewer);CHKERRQ(ierr); 447 } else { 448 ierr = PetscViewerASCIIPrintf(viewer,"Not yet available\n");CHKERRQ(ierr); 449 } 450 ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr); 451 } 452 } 453 } else if (isdraw) { 454 PetscDraw draw; 455 PetscReal x,w,y,bottom,th,wth; 456 SNES_FAS *curfas = fas; 457 ierr = PetscViewerDrawGetDraw(viewer,0,&draw);CHKERRQ(ierr); 458 ierr = PetscDrawGetCurrentPoint(draw,&x,&y);CHKERRQ(ierr); 459 ierr = PetscDrawStringGetSize(draw,&wth,&th);CHKERRQ(ierr); 460 bottom = y - th; 461 while (curfas) { 462 if (!curfas->smoothu) { 463 ierr = PetscDrawPushCurrentPoint(draw,x,bottom);CHKERRQ(ierr); 464 if (curfas->smoothd) ierr = SNESView(curfas->smoothd,viewer);CHKERRQ(ierr); 465 ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr); 466 } else { 467 w = 0.5*PetscMin(1.0-x,x); 468 ierr = PetscDrawPushCurrentPoint(draw,x-w,bottom);CHKERRQ(ierr); 469 if (curfas->smoothd) ierr = SNESView(curfas->smoothd,viewer);CHKERRQ(ierr); 470 ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr); 471 ierr = PetscDrawPushCurrentPoint(draw,x+w,bottom);CHKERRQ(ierr); 472 if (curfas->smoothu) ierr = SNESView(curfas->smoothu,viewer);CHKERRQ(ierr); 473 ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr); 474 } 475 /* this is totally bogus but we have no way of knowing how low the previous one was draw to */ 476 bottom -= 5*th; 477 if (curfas->next) curfas = (SNES_FAS*)curfas->next->data; 478 else curfas = NULL; 479 } 480 } 481 } 482 PetscFunctionReturn(0); 483 } 484 485 #undef __FUNCT__ 486 #define __FUNCT__ "SNESFASDownSmooth_Private" 487 /* 488 Defines the action of the downsmoother 489 */ 490 PetscErrorCode SNESFASDownSmooth_Private(SNES snes, Vec B, Vec X, Vec F, PetscReal *fnorm) 491 { 492 PetscErrorCode ierr = 0; 493 SNESConvergedReason reason; 494 Vec FPC; 495 SNES smoothd; 496 SNES_FAS *fas = (SNES_FAS*) snes->data; 497 498 PetscFunctionBegin; 499 ierr = SNESFASCycleGetSmootherDown(snes, &smoothd);CHKERRQ(ierr); 500 ierr = SNESSetInitialFunction(smoothd, F);CHKERRQ(ierr); 501 if (fas->eventsmoothsolve) {ierr = PetscLogEventBegin(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 502 ierr = SNESSolve(smoothd, B, X);CHKERRQ(ierr); 503 if (fas->eventsmoothsolve) {ierr = PetscLogEventEnd(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 504 /* check convergence reason for the smoother */ 505 ierr = SNESGetConvergedReason(smoothd,&reason);CHKERRQ(ierr); 506 if (reason < 0 && !(reason == SNES_DIVERGED_MAX_IT || reason == SNES_DIVERGED_LOCAL_MIN || reason == SNES_DIVERGED_LINE_SEARCH)) { 507 snes->reason = SNES_DIVERGED_INNER; 508 PetscFunctionReturn(0); 509 } 510 ierr = SNESGetFunction(smoothd, &FPC, NULL, NULL);CHKERRQ(ierr); 511 ierr = VecCopy(FPC, F);CHKERRQ(ierr); 512 if (fnorm) {ierr = VecNorm(F,NORM_2,fnorm);CHKERRQ(ierr);} 513 PetscFunctionReturn(0); 514 } 515 516 517 #undef __FUNCT__ 518 #define __FUNCT__ "SNESFASUpSmooth_Private" 519 /* 520 Defines the action of the upsmoother 521 */ 522 PetscErrorCode SNESFASUpSmooth_Private(SNES snes, Vec B, Vec X, Vec F, PetscReal *fnorm) 523 { 524 PetscErrorCode ierr = 0; 525 SNESConvergedReason reason; 526 Vec FPC; 527 SNES smoothu; 528 SNES_FAS *fas = (SNES_FAS*) snes->data; 529 530 PetscFunctionBegin; 531 ierr = SNESFASCycleGetSmootherUp(snes, &smoothu);CHKERRQ(ierr); 532 if (fas->eventsmoothsolve) {ierr = PetscLogEventBegin(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 533 ierr = SNESSolve(smoothu, B, X);CHKERRQ(ierr); 534 if (fas->eventsmoothsolve) {ierr = PetscLogEventEnd(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 535 /* check convergence reason for the smoother */ 536 ierr = SNESGetConvergedReason(smoothu,&reason);CHKERRQ(ierr); 537 if (reason < 0 && !(reason == SNES_DIVERGED_MAX_IT || reason == SNES_DIVERGED_LOCAL_MIN || reason == SNES_DIVERGED_LINE_SEARCH)) { 538 snes->reason = SNES_DIVERGED_INNER; 539 PetscFunctionReturn(0); 540 } 541 ierr = SNESGetFunction(smoothu, &FPC, NULL, NULL);CHKERRQ(ierr); 542 ierr = VecCopy(FPC, F);CHKERRQ(ierr); 543 if (fnorm) {ierr = VecNorm(F,NORM_2,fnorm);CHKERRQ(ierr);} 544 PetscFunctionReturn(0); 545 } 546 547 #undef __FUNCT__ 548 #define __FUNCT__ "SNESFASCreateCoarseVec" 549 /*@ 550 SNESFASCreateCoarseVec - create Vec corresponding to a state vector on one level coarser than current level 551 552 Collective 553 554 Input Arguments: 555 . snes - SNESFAS 556 557 Output Arguments: 558 . Xcoarse - vector on level one coarser than snes 559 560 Level: developer 561 562 .seealso: SNESFASSetRestriction(), SNESFASRestrict() 563 @*/ 564 PetscErrorCode SNESFASCreateCoarseVec(SNES snes,Vec *Xcoarse) 565 { 566 PetscErrorCode ierr; 567 SNES_FAS *fas = (SNES_FAS*)snes->data; 568 569 PetscFunctionBegin; 570 if (fas->rscale) { 571 ierr = VecDuplicate(fas->rscale,Xcoarse);CHKERRQ(ierr); 572 } else if (fas->inject) { 573 ierr = MatCreateVecs(fas->inject,Xcoarse,NULL);CHKERRQ(ierr); 574 } else SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE,"Must set restriction or injection");CHKERRQ(ierr); 575 PetscFunctionReturn(0); 576 } 577 578 #undef __FUNCT__ 579 #define __FUNCT__ "SNESFASRestrict" 580 /*@ 581 SNESFASRestrict - restrict a Vec to the next coarser level 582 583 Collective 584 585 Input Arguments: 586 + fine - SNES from which to restrict 587 - Xfine - vector to restrict 588 589 Output Arguments: 590 . Xcoarse - result of restriction 591 592 Level: developer 593 594 .seealso: SNESFASSetRestriction(), SNESFASSetInjection() 595 @*/ 596 PetscErrorCode SNESFASRestrict(SNES fine,Vec Xfine,Vec Xcoarse) 597 { 598 PetscErrorCode ierr; 599 SNES_FAS *fas = (SNES_FAS*)fine->data; 600 601 PetscFunctionBegin; 602 PetscValidHeaderSpecific(fine,SNES_CLASSID,1); 603 PetscValidHeaderSpecific(Xfine,VEC_CLASSID,2); 604 PetscValidHeaderSpecific(Xcoarse,VEC_CLASSID,3); 605 if (fas->inject) { 606 ierr = MatRestrict(fas->inject,Xfine,Xcoarse);CHKERRQ(ierr); 607 } else { 608 ierr = MatRestrict(fas->restrct,Xfine,Xcoarse);CHKERRQ(ierr); 609 ierr = VecPointwiseMult(Xcoarse,fas->rscale,Xcoarse);CHKERRQ(ierr); 610 } 611 PetscFunctionReturn(0); 612 } 613 614 #undef __FUNCT__ 615 #define __FUNCT__ "SNESFASCoarseCorrection" 616 /* 617 618 Performs the FAS coarse correction as: 619 620 fine problem: F(x) = b 621 coarse problem: F^c(x^c) = b^c 622 623 b^c = F^c(Rx) - R(F(x) - b) 624 625 */ 626 PetscErrorCode SNESFASCoarseCorrection(SNES snes, Vec X, Vec F, Vec X_new) 627 { 628 PetscErrorCode ierr; 629 Vec X_c, Xo_c, F_c, B_c; 630 SNESConvergedReason reason; 631 SNES next; 632 Mat restrct, interpolate; 633 SNES_FAS *fasc; 634 635 PetscFunctionBegin; 636 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 637 if (next) { 638 fasc = (SNES_FAS*)next->data; 639 640 ierr = SNESFASCycleGetRestriction(snes, &restrct);CHKERRQ(ierr); 641 ierr = SNESFASCycleGetInterpolation(snes, &interpolate);CHKERRQ(ierr); 642 643 X_c = next->vec_sol; 644 Xo_c = next->work[0]; 645 F_c = next->vec_func; 646 B_c = next->vec_rhs; 647 648 if (fasc->eventinterprestrict) {ierr = PetscLogEventBegin(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 649 ierr = SNESFASRestrict(snes,X,Xo_c);CHKERRQ(ierr); 650 /* restrict the defect: R(F(x) - b) */ 651 ierr = MatRestrict(restrct, F, B_c);CHKERRQ(ierr); 652 if (fasc->eventinterprestrict) {ierr = PetscLogEventEnd(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 653 654 if (fasc->eventresidual) {ierr = PetscLogEventBegin(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 655 /* F_c = F^c(Rx) - R(F(x) - b) since the second term was sitting in next->vec_rhs */ 656 ierr = SNESComputeFunction(next, Xo_c, F_c);CHKERRQ(ierr); 657 if (fasc->eventresidual) {ierr = PetscLogEventEnd(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 658 659 /* solve the coarse problem corresponding to F^c(x^c) = b^c = F^c(Rx) - R(F(x) - b) */ 660 ierr = VecCopy(B_c, X_c);CHKERRQ(ierr); 661 ierr = VecCopy(F_c, B_c);CHKERRQ(ierr); 662 ierr = VecCopy(X_c, F_c);CHKERRQ(ierr); 663 /* set initial guess of the coarse problem to the projected fine solution */ 664 ierr = VecCopy(Xo_c, X_c);CHKERRQ(ierr); 665 666 /* recurse to the next level */ 667 ierr = SNESSetInitialFunction(next, F_c);CHKERRQ(ierr); 668 ierr = SNESSolve(next, B_c, X_c);CHKERRQ(ierr); 669 ierr = SNESGetConvergedReason(next,&reason);CHKERRQ(ierr); 670 if (reason < 0 && reason != SNES_DIVERGED_MAX_IT) { 671 snes->reason = SNES_DIVERGED_INNER; 672 PetscFunctionReturn(0); 673 } 674 /* correct as x <- x + I(x^c - Rx)*/ 675 ierr = VecAXPY(X_c, -1.0, Xo_c);CHKERRQ(ierr); 676 677 if (fasc->eventinterprestrict) {ierr = PetscLogEventBegin(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 678 ierr = MatInterpolateAdd(interpolate, X_c, X, X_new);CHKERRQ(ierr); 679 if (fasc->eventinterprestrict) {ierr = PetscLogEventEnd(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 680 } 681 PetscFunctionReturn(0); 682 } 683 684 #undef __FUNCT__ 685 #define __FUNCT__ "SNESFASCycle_Additive" 686 /* 687 688 The additive cycle looks like: 689 690 xhat = x 691 xhat = dS(x, b) 692 x = coarsecorrection(xhat, b_d) 693 x = x + nu*(xhat - x); 694 (optional) x = uS(x, b) 695 696 With the coarse RHS (defect correction) as below. 697 698 */ 699 PetscErrorCode SNESFASCycle_Additive(SNES snes, Vec X) 700 { 701 Vec F, B, Xhat; 702 Vec X_c, Xo_c, F_c, B_c; 703 PetscErrorCode ierr; 704 SNESConvergedReason reason; 705 PetscReal xnorm, fnorm, ynorm; 706 PetscBool lssuccess; 707 SNES next; 708 Mat restrct, interpolate; 709 SNES_FAS *fas = (SNES_FAS*)snes->data,*fasc; 710 711 PetscFunctionBegin; 712 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 713 F = snes->vec_func; 714 B = snes->vec_rhs; 715 Xhat = snes->work[1]; 716 ierr = VecCopy(X, Xhat);CHKERRQ(ierr); 717 /* recurse first */ 718 if (next) { 719 fasc = (SNES_FAS*)next->data; 720 ierr = SNESFASCycleGetRestriction(snes, &restrct);CHKERRQ(ierr); 721 ierr = SNESFASCycleGetInterpolation(snes, &interpolate);CHKERRQ(ierr); 722 if (fas->eventresidual) {ierr = PetscLogEventBegin(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 723 ierr = SNESComputeFunction(snes, Xhat, F);CHKERRQ(ierr); 724 if (fas->eventresidual) {ierr = PetscLogEventEnd(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 725 ierr = VecNorm(F, NORM_2, &fnorm);CHKERRQ(ierr); 726 X_c = next->vec_sol; 727 Xo_c = next->work[0]; 728 F_c = next->vec_func; 729 B_c = next->vec_rhs; 730 731 ierr = SNESFASRestrict(snes,Xhat,Xo_c);CHKERRQ(ierr); 732 /* restrict the defect */ 733 ierr = MatRestrict(restrct, F, B_c);CHKERRQ(ierr); 734 735 /* solve the coarse problem corresponding to F^c(x^c) = b^c = Rb + F^c(Rx) - RF(x) */ 736 if (fasc->eventresidual) {ierr = PetscLogEventBegin(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 737 ierr = SNESComputeFunction(next, Xo_c, F_c);CHKERRQ(ierr); 738 if (fasc->eventresidual) {ierr = PetscLogEventEnd(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 739 ierr = VecCopy(B_c, X_c);CHKERRQ(ierr); 740 ierr = VecCopy(F_c, B_c);CHKERRQ(ierr); 741 ierr = VecCopy(X_c, F_c);CHKERRQ(ierr); 742 /* set initial guess of the coarse problem to the projected fine solution */ 743 ierr = VecCopy(Xo_c, X_c);CHKERRQ(ierr); 744 745 /* recurse */ 746 ierr = SNESSetInitialFunction(next, F_c);CHKERRQ(ierr); 747 ierr = SNESSolve(next, B_c, X_c);CHKERRQ(ierr); 748 749 /* smooth on this level */ 750 ierr = SNESFASDownSmooth_Private(snes, B, X, F, &fnorm);CHKERRQ(ierr); 751 752 ierr = SNESGetConvergedReason(next,&reason);CHKERRQ(ierr); 753 if (reason < 0 && reason != SNES_DIVERGED_MAX_IT) { 754 snes->reason = SNES_DIVERGED_INNER; 755 PetscFunctionReturn(0); 756 } 757 758 /* correct as x <- x + I(x^c - Rx)*/ 759 ierr = VecAYPX(X_c, -1.0, Xo_c);CHKERRQ(ierr); 760 ierr = MatInterpolate(interpolate, X_c, Xhat);CHKERRQ(ierr); 761 762 /* additive correction of the coarse direction*/ 763 ierr = SNESLineSearchApply(snes->linesearch, X, F, &fnorm, Xhat);CHKERRQ(ierr); 764 ierr = SNESLineSearchGetSuccess(snes->linesearch, &lssuccess);CHKERRQ(ierr); 765 if (!lssuccess) { 766 if (++snes->numFailures >= snes->maxFailures) { 767 snes->reason = SNES_DIVERGED_LINE_SEARCH; 768 PetscFunctionReturn(0); 769 } 770 } 771 ierr = SNESLineSearchGetNorms(snes->linesearch, &xnorm, &snes->norm, &ynorm);CHKERRQ(ierr); 772 } else { 773 ierr = SNESFASDownSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr); 774 } 775 PetscFunctionReturn(0); 776 } 777 778 #undef __FUNCT__ 779 #define __FUNCT__ "SNESFASCycle_Multiplicative" 780 /* 781 782 Defines the FAS cycle as: 783 784 fine problem: F(x) = b 785 coarse problem: F^c(x) = b^c 786 787 b^c = F^c(Rx) - R(F(x) - b) 788 789 correction: 790 791 x = x + I(x^c - Rx) 792 793 */ 794 PetscErrorCode SNESFASCycle_Multiplicative(SNES snes, Vec X) 795 { 796 797 PetscErrorCode ierr; 798 Vec F,B; 799 SNES next; 800 801 PetscFunctionBegin; 802 F = snes->vec_func; 803 B = snes->vec_rhs; 804 /* pre-smooth -- just update using the pre-smoother */ 805 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 806 ierr = SNESFASDownSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr); 807 if (next) { 808 ierr = SNESFASCoarseCorrection(snes, X, F, X);CHKERRQ(ierr); 809 ierr = SNESFASUpSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr); 810 } 811 PetscFunctionReturn(0); 812 } 813 814 #undef __FUNCT__ 815 #define __FUNCT__ "SNESFASCycleSetupPhase_Full" 816 PetscErrorCode SNESFASCycleSetupPhase_Full(SNES snes) 817 { 818 SNES next; 819 SNES_FAS *fas = (SNES_FAS*)snes->data; 820 PetscBool isFine; 821 PetscErrorCode ierr; 822 823 PetscFunctionBegin; 824 /* pre-smooth -- just update using the pre-smoother */ 825 ierr = SNESFASCycleIsFine(snes,&isFine);CHKERRQ(ierr); 826 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 827 fas->full_stage = 0; 828 if (next) {ierr = SNESFASCycleSetupPhase_Full(next);CHKERRQ(ierr);} 829 PetscFunctionReturn(0); 830 } 831 832 #undef __FUNCT__ 833 #define __FUNCT__ "SNESFASCycle_Full" 834 PetscErrorCode SNESFASCycle_Full(SNES snes, Vec X) 835 { 836 PetscErrorCode ierr; 837 Vec F,B; 838 SNES_FAS *fas = (SNES_FAS*)snes->data; 839 PetscBool isFine; 840 SNES next; 841 842 PetscFunctionBegin; 843 F = snes->vec_func; 844 B = snes->vec_rhs; 845 ierr = SNESFASCycleIsFine(snes,&isFine);CHKERRQ(ierr); 846 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 847 848 if (isFine) { 849 ierr = SNESFASCycleSetupPhase_Full(snes);CHKERRQ(ierr); 850 } 851 852 if (fas->full_stage == 0) { 853 /* downsweep */ 854 if (next) { 855 if (fas->level != 1) next->max_its += 1; 856 if (fas->full_downsweep||isFine) {ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);} 857 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 858 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 859 if (fas->level != 1) next->max_its -= 1; 860 } else { 861 ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 862 } 863 fas->full_stage = 1; 864 } else if (fas->full_stage == 1) { 865 if (snes->iter == 0) {ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);} 866 if (next) { 867 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 868 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 869 } 870 } 871 /* final v-cycle */ 872 if (isFine) { 873 if (next) { 874 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 875 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 876 } 877 } 878 PetscFunctionReturn(0); 879 } 880 881 #undef __FUNCT__ 882 #define __FUNCT__ "SNESFASCycle_Kaskade" 883 PetscErrorCode SNESFASCycle_Kaskade(SNES snes, Vec X) 884 { 885 PetscErrorCode ierr; 886 Vec F,B; 887 SNES next; 888 889 PetscFunctionBegin; 890 F = snes->vec_func; 891 B = snes->vec_rhs; 892 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 893 if (next) { 894 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 895 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 896 } else { 897 ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 898 } 899 PetscFunctionReturn(0); 900 } 901 902 PetscBool SNEScite = PETSC_FALSE; 903 const char SNESCitation[] = "@techreport{pbmkbsxt2012,\n" 904 " title = {Composing Scalable Nonlinear Algebraic Solvers},\n" 905 " author = {Peter Brune and Mathew Knepley and Barry Smith and Xuemin Tu},\n" 906 " year = 2013,\n" 907 " type = Preprint,\n" 908 " number = {ANL/MCS-P2010-0112},\n" 909 " institution = {Argonne National Laboratory}\n}\n"; 910 911 #undef __FUNCT__ 912 #define __FUNCT__ "SNESSolve_FAS" 913 PetscErrorCode SNESSolve_FAS(SNES snes) 914 { 915 PetscErrorCode ierr; 916 PetscInt i, maxits; 917 Vec X, F; 918 PetscReal fnorm; 919 SNES_FAS *fas = (SNES_FAS*)snes->data,*ffas; 920 DM dm; 921 PetscBool isFine; 922 923 PetscFunctionBegin; 924 ierr = PetscCitationsRegister(SNESCitation,&SNEScite);CHKERRQ(ierr); 925 maxits = snes->max_its; /* maximum number of iterations */ 926 snes->reason = SNES_CONVERGED_ITERATING; 927 X = snes->vec_sol; 928 F = snes->vec_func; 929 930 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 931 /*norm setup */ 932 ierr = PetscObjectSAWsTakeAccess((PetscObject)snes);CHKERRQ(ierr); 933 snes->iter = 0; 934 snes->norm = 0.; 935 ierr = PetscObjectSAWsGrantAccess((PetscObject)snes);CHKERRQ(ierr); 936 if (!snes->vec_func_init_set) { 937 if (fas->eventresidual) {ierr = PetscLogEventBegin(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 938 ierr = SNESComputeFunction(snes,X,F);CHKERRQ(ierr); 939 if (fas->eventresidual) {ierr = PetscLogEventEnd(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 940 if (snes->domainerror) { 941 snes->reason = SNES_DIVERGED_FUNCTION_DOMAIN; 942 PetscFunctionReturn(0); 943 } 944 } else snes->vec_func_init_set = PETSC_FALSE; 945 946 ierr = VecNorm(F, NORM_2, &fnorm);CHKERRQ(ierr); /* fnorm <- ||F|| */ 947 if (PetscIsInfOrNanReal(fnorm)) { 948 snes->reason = SNES_DIVERGED_FNORM_NAN; 949 PetscFunctionReturn(0); 950 } 951 952 ierr = PetscObjectSAWsTakeAccess((PetscObject)snes);CHKERRQ(ierr); 953 snes->norm = fnorm; 954 ierr = PetscObjectSAWsGrantAccess((PetscObject)snes);CHKERRQ(ierr); 955 ierr = SNESLogConvergenceHistory(snes,fnorm,0);CHKERRQ(ierr); 956 ierr = SNESMonitor(snes,0,fnorm);CHKERRQ(ierr); 957 958 /* test convergence */ 959 ierr = (*snes->ops->converged)(snes,0,0.0,0.0,fnorm,&snes->reason,snes->cnvP);CHKERRQ(ierr); 960 if (snes->reason) PetscFunctionReturn(0); 961 962 963 if (isFine) { 964 /* propagate scale-dependent data up the hierarchy */ 965 ierr = SNESGetDM(snes,&dm);CHKERRQ(ierr); 966 for (ffas=fas; ffas->next; ffas=(SNES_FAS*)ffas->next->data) { 967 DM dmcoarse; 968 ierr = SNESGetDM(ffas->next,&dmcoarse);CHKERRQ(ierr); 969 ierr = DMRestrict(dm,ffas->restrct,ffas->rscale,ffas->inject,dmcoarse);CHKERRQ(ierr); 970 dm = dmcoarse; 971 } 972 } 973 974 for (i = 0; i < maxits; i++) { 975 /* Call general purpose update function */ 976 977 if (snes->ops->update) { 978 ierr = (*snes->ops->update)(snes, snes->iter);CHKERRQ(ierr); 979 } 980 if (fas->fastype == SNES_FAS_MULTIPLICATIVE) { 981 ierr = SNESFASCycle_Multiplicative(snes, X);CHKERRQ(ierr); 982 } else if (fas->fastype == SNES_FAS_ADDITIVE) { 983 ierr = SNESFASCycle_Additive(snes, X);CHKERRQ(ierr); 984 } else if (fas->fastype == SNES_FAS_FULL) { 985 ierr = SNESFASCycle_Full(snes, X);CHKERRQ(ierr); 986 } else if (fas->fastype ==SNES_FAS_KASKADE) { 987 ierr = SNESFASCycle_Kaskade(snes, X);CHKERRQ(ierr); 988 } else { 989 SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE,"Unsupported FAS type"); 990 } 991 992 /* check for FAS cycle divergence */ 993 if (snes->reason != SNES_CONVERGED_ITERATING) PetscFunctionReturn(0); 994 995 /* Monitor convergence */ 996 ierr = PetscObjectSAWsTakeAccess((PetscObject)snes);CHKERRQ(ierr); 997 snes->iter = i+1; 998 ierr = PetscObjectSAWsGrantAccess((PetscObject)snes);CHKERRQ(ierr); 999 ierr = SNESLogConvergenceHistory(snes,snes->norm,0);CHKERRQ(ierr); 1000 ierr = SNESMonitor(snes,snes->iter,snes->norm);CHKERRQ(ierr); 1001 /* Test for convergence */ 1002 if (isFine) { 1003 ierr = (*snes->ops->converged)(snes,snes->iter,0.0,0.0,snes->norm,&snes->reason,snes->cnvP);CHKERRQ(ierr); 1004 if (snes->reason) break; 1005 } 1006 } 1007 if (i == maxits) { 1008 ierr = PetscInfo1(snes, "Maximum number of iterations has been reached: %D\n", maxits);CHKERRQ(ierr); 1009 if (!snes->reason) snes->reason = SNES_DIVERGED_MAX_IT; 1010 } 1011 PetscFunctionReturn(0); 1012 } 1013