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 SNESFASGalerkinDefaultFunction(SNES,Vec,Vec,void*); 7 8 #undef __FUNCT__ 9 #define __FUNCT__ "SNESReset_FAS" 10 static PetscErrorCode SNESReset_FAS(SNES snes) 11 { 12 PetscErrorCode ierr = 0; 13 SNES_FAS * fas = (SNES_FAS*)snes->data; 14 15 PetscFunctionBegin; 16 ierr = SNESDestroy(&fas->smoothu);CHKERRQ(ierr); 17 ierr = SNESDestroy(&fas->smoothd);CHKERRQ(ierr); 18 ierr = MatDestroy(&fas->inject);CHKERRQ(ierr); 19 ierr = MatDestroy(&fas->interpolate);CHKERRQ(ierr); 20 ierr = MatDestroy(&fas->restrct);CHKERRQ(ierr); 21 ierr = VecDestroy(&fas->rscale);CHKERRQ(ierr); 22 if (fas->galerkin) { 23 ierr = VecDestroy(&fas->Xg);CHKERRQ(ierr); 24 ierr = VecDestroy(&fas->Fg);CHKERRQ(ierr); 25 } 26 if (fas->next) {ierr = SNESReset(fas->next);CHKERRQ(ierr);} 27 PetscFunctionReturn(0); 28 } 29 30 #undef __FUNCT__ 31 #define __FUNCT__ "SNESDestroy_FAS" 32 static PetscErrorCode SNESDestroy_FAS(SNES snes) 33 { 34 SNES_FAS * fas = (SNES_FAS*)snes->data; 35 PetscErrorCode ierr = 0; 36 37 PetscFunctionBegin; 38 /* recursively resets and then destroys */ 39 ierr = SNESReset(snes);CHKERRQ(ierr); 40 if (fas->next) { 41 ierr = SNESDestroy(&fas->next);CHKERRQ(ierr); 42 } 43 ierr = PetscFree(fas);CHKERRQ(ierr); 44 PetscFunctionReturn(0); 45 } 46 47 #undef __FUNCT__ 48 #define __FUNCT__ "SNESSetUp_FAS" 49 static PetscErrorCode SNESSetUp_FAS(SNES snes) 50 { 51 SNES_FAS *fas = (SNES_FAS*) snes->data; 52 PetscErrorCode ierr; 53 PetscInt dm_levels; 54 Vec vec_sol, vec_func, vec_sol_update, vec_rhs; /* preserve these if they're set through the reset */ 55 SNES next; 56 PetscBool isFine; 57 SNESLineSearch linesearch; 58 SNESLineSearch slinesearch; 59 void *lsprectx,*lspostctx; 60 PetscErrorCode (*precheck)(SNESLineSearch,Vec,Vec,PetscBool*,void*); 61 PetscErrorCode (*postcheck)(SNESLineSearch,Vec,Vec,Vec,PetscBool*,PetscBool*,void*); 62 63 PetscFunctionBegin; 64 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 65 if (fas->usedmfornumberoflevels && isFine) { 66 ierr = DMGetRefineLevel(snes->dm,&dm_levels);CHKERRQ(ierr); 67 dm_levels++; 68 if (dm_levels > fas->levels) { 69 /* we don't want the solution and func vectors to be destroyed in the SNESReset when it's called in SNESFASSetLevels_FAS*/ 70 vec_sol = snes->vec_sol; 71 vec_func = snes->vec_func; 72 vec_sol_update = snes->vec_sol_update; 73 vec_rhs = snes->vec_rhs; 74 snes->vec_sol = NULL; 75 snes->vec_func = NULL; 76 snes->vec_sol_update = NULL; 77 snes->vec_rhs = NULL; 78 79 /* reset the number of levels */ 80 ierr = SNESFASSetLevels(snes,dm_levels,NULL);CHKERRQ(ierr); 81 ierr = SNESSetFromOptions(snes);CHKERRQ(ierr); 82 83 snes->vec_sol = vec_sol; 84 snes->vec_func = vec_func; 85 snes->vec_rhs = vec_rhs; 86 snes->vec_sol_update = vec_sol_update; 87 } 88 } 89 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 90 if (!isFine) snes->gridsequence = 0; /* no grid sequencing inside the multigrid hierarchy! */ 91 92 ierr = SNESSetWorkVecs(snes, 2);CHKERRQ(ierr); /* work vectors used for intergrid transfers */ 93 94 /* set up the smoothers if they haven't already been set up */ 95 if (!fas->smoothd) { 96 ierr = SNESFASCycleCreateSmoother_Private(snes, &fas->smoothd);CHKERRQ(ierr); 97 } 98 99 if (snes->dm) { 100 /* set the smoother DMs properly */ 101 if (fas->smoothu) ierr = SNESSetDM(fas->smoothu, snes->dm);CHKERRQ(ierr); 102 ierr = SNESSetDM(fas->smoothd, snes->dm);CHKERRQ(ierr); 103 /* construct EVERYTHING from the DM -- including the progressive set of smoothers */ 104 if (next) { 105 /* for now -- assume the DM and the evaluation functions have been set externally */ 106 if (!next->dm) { 107 ierr = DMCoarsen(snes->dm, PetscObjectComm((PetscObject)next), &next->dm);CHKERRQ(ierr); 108 ierr = SNESSetDM(next, next->dm);CHKERRQ(ierr); 109 } 110 /* set the interpolation and restriction from the DM */ 111 if (!fas->interpolate) { 112 ierr = DMCreateInterpolation(next->dm, snes->dm, &fas->interpolate, &fas->rscale);CHKERRQ(ierr); 113 if (!fas->restrct) { 114 ierr = PetscObjectReference((PetscObject)fas->interpolate);CHKERRQ(ierr); 115 fas->restrct = fas->interpolate; 116 } 117 } 118 /* set the injection from the DM */ 119 if (!fas->inject) { 120 ierr = DMCreateInjection(next->dm, snes->dm, &fas->inject);CHKERRQ(ierr); 121 } 122 } 123 } 124 /*pass the smoother, function, and jacobian up to the next level if it's not user set already */ 125 if (fas->galerkin) { 126 if (next) { 127 ierr = SNESSetFunction(next, NULL, SNESFASGalerkinDefaultFunction, next);CHKERRQ(ierr); 128 } 129 if (fas->smoothd && fas->level != fas->levels - 1) { 130 ierr = SNESSetFunction(fas->smoothd, NULL, SNESFASGalerkinDefaultFunction, snes);CHKERRQ(ierr); 131 } 132 if (fas->smoothu && fas->level != fas->levels - 1) { 133 ierr = SNESSetFunction(fas->smoothu, NULL, SNESFASGalerkinDefaultFunction, snes);CHKERRQ(ierr); 134 } 135 } 136 137 /* sets the down (pre) smoother's default norm and sets it from options */ 138 if (fas->smoothd) { 139 if (fas->level == 0 && fas->levels != 1) { 140 ierr = SNESSetNormSchedule(fas->smoothd, SNES_NORM_NONE);CHKERRQ(ierr); 141 } else { 142 ierr = SNESSetNormSchedule(fas->smoothd, SNES_NORM_FINAL_ONLY);CHKERRQ(ierr); 143 } 144 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)snes, (PetscObject)fas->smoothd);CHKERRQ(ierr); 145 ierr = SNESSetFromOptions(fas->smoothd);CHKERRQ(ierr); 146 ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr); 147 ierr = SNESGetLineSearch(fas->smoothd,&slinesearch);CHKERRQ(ierr); 148 ierr = SNESLineSearchGetPreCheck(linesearch,&precheck,&lsprectx);CHKERRQ(ierr); 149 ierr = SNESLineSearchGetPostCheck(linesearch,&postcheck,&lspostctx);CHKERRQ(ierr); 150 ierr = SNESLineSearchSetPreCheck(slinesearch,precheck,lsprectx);CHKERRQ(ierr); 151 ierr = SNESLineSearchSetPostCheck(slinesearch,postcheck,lspostctx);CHKERRQ(ierr); 152 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)linesearch, (PetscObject)slinesearch);CHKERRQ(ierr); 153 154 fas->smoothd->vec_sol = snes->vec_sol; 155 ierr = PetscObjectReference((PetscObject)snes->vec_sol);CHKERRQ(ierr); 156 fas->smoothd->vec_sol_update = snes->vec_sol_update; 157 ierr = PetscObjectReference((PetscObject)snes->vec_sol_update);CHKERRQ(ierr); 158 fas->smoothd->vec_func = snes->vec_func; 159 ierr = PetscObjectReference((PetscObject)snes->vec_func);CHKERRQ(ierr); 160 161 if (fas->eventsmoothsetup) {ierr = PetscLogEventBegin(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 162 ierr = SNESSetUp(fas->smoothd);CHKERRQ(ierr); 163 if (fas->eventsmoothsetup) {ierr = PetscLogEventEnd(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 164 } 165 166 /* sets the up (post) smoother's default norm and sets it from options */ 167 if (fas->smoothu) { 168 if (fas->level != fas->levels - 1) { 169 ierr = SNESSetNormSchedule(fas->smoothu, SNES_NORM_NONE);CHKERRQ(ierr); 170 } else { 171 ierr = SNESSetNormSchedule(fas->smoothu, SNES_NORM_FINAL_ONLY);CHKERRQ(ierr); 172 } 173 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)snes, (PetscObject)fas->smoothu);CHKERRQ(ierr); 174 ierr = SNESSetFromOptions(fas->smoothu);CHKERRQ(ierr); 175 ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr); 176 ierr = SNESGetLineSearch(fas->smoothu,&slinesearch);CHKERRQ(ierr); 177 ierr = SNESLineSearchGetPreCheck(linesearch,&precheck,&lsprectx);CHKERRQ(ierr); 178 ierr = SNESLineSearchGetPostCheck(linesearch,&postcheck,&lspostctx);CHKERRQ(ierr); 179 ierr = SNESLineSearchSetPreCheck(slinesearch,precheck,lsprectx);CHKERRQ(ierr); 180 ierr = SNESLineSearchSetPostCheck(slinesearch,postcheck,lspostctx);CHKERRQ(ierr); 181 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)linesearch, (PetscObject)slinesearch);CHKERRQ(ierr); 182 183 fas->smoothu->vec_sol = snes->vec_sol; 184 ierr = PetscObjectReference((PetscObject)snes->vec_sol);CHKERRQ(ierr); 185 fas->smoothu->vec_sol_update = snes->vec_sol_update; 186 ierr = PetscObjectReference((PetscObject)snes->vec_sol_update);CHKERRQ(ierr); 187 fas->smoothu->vec_func = snes->vec_func; 188 ierr = PetscObjectReference((PetscObject)snes->vec_func);CHKERRQ(ierr); 189 190 if (fas->eventsmoothsetup) {ierr = PetscLogEventBegin(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 191 ierr = SNESSetUp(fas->smoothu);CHKERRQ(ierr); 192 if (fas->eventsmoothsetup) {ierr = PetscLogEventEnd(fas->eventsmoothsetup,0,0,0,0);CHKERRQ(ierr);} 193 194 } 195 196 if (next) { 197 /* gotta set up the solution vector for this to work */ 198 if (!next->vec_sol) {ierr = SNESFASCreateCoarseVec(snes,&next->vec_sol);CHKERRQ(ierr);} 199 if (!next->vec_rhs) {ierr = SNESFASCreateCoarseVec(snes,&next->vec_rhs);CHKERRQ(ierr);} 200 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)snes, (PetscObject)next);CHKERRQ(ierr); 201 ierr = SNESGetLineSearch(snes,&linesearch);CHKERRQ(ierr); 202 ierr = SNESGetLineSearch(fas->next,&slinesearch);CHKERRQ(ierr); 203 ierr = SNESLineSearchGetPreCheck(linesearch,&precheck,&lsprectx);CHKERRQ(ierr); 204 ierr = SNESLineSearchGetPostCheck(linesearch,&postcheck,&lspostctx);CHKERRQ(ierr); 205 ierr = SNESLineSearchSetPreCheck(slinesearch,precheck,lsprectx);CHKERRQ(ierr); 206 ierr = SNESLineSearchSetPostCheck(slinesearch,postcheck,lspostctx);CHKERRQ(ierr); 207 ierr = PetscObjectCopyFortranFunctionPointers((PetscObject)linesearch, (PetscObject)slinesearch);CHKERRQ(ierr); 208 ierr = SNESSetUp(next);CHKERRQ(ierr); 209 } 210 /* setup FAS work vectors */ 211 if (fas->galerkin) { 212 ierr = VecDuplicate(snes->vec_sol, &fas->Xg);CHKERRQ(ierr); 213 ierr = VecDuplicate(snes->vec_sol, &fas->Fg);CHKERRQ(ierr); 214 } 215 PetscFunctionReturn(0); 216 } 217 218 #undef __FUNCT__ 219 #define __FUNCT__ "SNESSetFromOptions_FAS" 220 static PetscErrorCode SNESSetFromOptions_FAS(PetscOptionItems *PetscOptionsObject,SNES snes) 221 { 222 SNES_FAS *fas = (SNES_FAS*) snes->data; 223 PetscInt levels = 1; 224 PetscBool flg = PETSC_FALSE, upflg = PETSC_FALSE, downflg = PETSC_FALSE, monflg = PETSC_FALSE, galerkinflg = PETSC_FALSE,continuationflg = PETSC_FALSE; 225 PetscErrorCode ierr; 226 SNESFASType fastype; 227 const char *optionsprefix; 228 SNESLineSearch linesearch; 229 PetscInt m, n_up, n_down; 230 SNES next; 231 PetscBool isFine; 232 233 PetscFunctionBegin; 234 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 235 ierr = PetscOptionsHead(PetscOptionsObject,"SNESFAS Options-----------------------------------");CHKERRQ(ierr); 236 237 /* number of levels -- only process most options on the finest level */ 238 if (isFine) { 239 ierr = PetscOptionsInt("-snes_fas_levels", "Number of Levels", "SNESFASSetLevels", levels, &levels, &flg);CHKERRQ(ierr); 240 if (!flg && snes->dm) { 241 ierr = DMGetRefineLevel(snes->dm,&levels);CHKERRQ(ierr); 242 levels++; 243 fas->usedmfornumberoflevels = PETSC_TRUE; 244 } 245 ierr = SNESFASSetLevels(snes, levels, NULL);CHKERRQ(ierr); 246 fastype = fas->fastype; 247 ierr = PetscOptionsEnum("-snes_fas_type","FAS correction type","SNESFASSetType",SNESFASTypes,(PetscEnum)fastype,(PetscEnum*)&fastype,&flg);CHKERRQ(ierr); 248 if (flg) { 249 ierr = SNESFASSetType(snes, fastype);CHKERRQ(ierr); 250 } 251 252 ierr = SNESGetOptionsPrefix(snes, &optionsprefix);CHKERRQ(ierr); 253 ierr = PetscOptionsInt("-snes_fas_cycles","Number of cycles","SNESFASSetCycles",fas->n_cycles,&m,&flg);CHKERRQ(ierr); 254 if (flg) { 255 ierr = SNESFASSetCycles(snes, m);CHKERRQ(ierr); 256 } 257 ierr = PetscOptionsBool("-snes_fas_continuation","Corrected grid-sequence continuation","SNESFASSetContinuation",fas->continuation,&continuationflg,&flg);CHKERRQ(ierr); 258 if (flg) { 259 ierr = SNESFASSetContinuation(snes,continuationflg);CHKERRQ(ierr); 260 } 261 262 ierr = PetscOptionsBool("-snes_fas_galerkin", "Form coarse problems with Galerkin","SNESFASSetGalerkin",fas->galerkin,&galerkinflg,&flg);CHKERRQ(ierr); 263 if (flg) { 264 ierr = SNESFASSetGalerkin(snes, galerkinflg);CHKERRQ(ierr); 265 } 266 267 if (fas->fastype == SNES_FAS_FULL) { 268 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); 269 if (flg) {SNESFASFullSetDownSweep(snes,fas->full_downsweep);CHKERRQ(ierr);} 270 } 271 272 ierr = PetscOptionsInt("-snes_fas_smoothup","Number of post-smoothing steps","SNESFASSetNumberSmoothUp",fas->max_up_it,&n_up,&upflg);CHKERRQ(ierr); 273 274 ierr = PetscOptionsInt("-snes_fas_smoothdown","Number of pre-smoothing steps","SNESFASSetNumberSmoothDown",fas->max_down_it,&n_down,&downflg);CHKERRQ(ierr); 275 276 { 277 PetscViewer viewer; 278 PetscViewerFormat format; 279 ierr = PetscOptionsGetViewer(PetscObjectComm((PetscObject)snes),((PetscObject)snes)->prefix, 280 "-snes_fas_monitor",&viewer,&format,&monflg);CHKERRQ(ierr); 281 if (monflg) { 282 PetscViewerAndFormat *vf; 283 ierr = PetscViewerAndFormatCreate(viewer,format,&vf);CHKERRQ(ierr); 284 ierr = PetscObjectDereference((PetscObject)viewer);CHKERRQ(ierr); 285 ierr = SNESFASSetMonitor(snes,vf,PETSC_TRUE);CHKERRQ(ierr); 286 } 287 } 288 flg = PETSC_FALSE; 289 monflg = PETSC_TRUE; 290 ierr = PetscOptionsBool("-snes_fas_log","Log times for each FAS level","SNESFASSetLog",monflg,&monflg,&flg);CHKERRQ(ierr); 291 if (flg) {ierr = SNESFASSetLog(snes,monflg);CHKERRQ(ierr);} 292 } 293 294 ierr = PetscOptionsTail();CHKERRQ(ierr); 295 /* setup from the determined types if there is no pointwise procedure or smoother defined */ 296 if (upflg) { 297 ierr = SNESFASSetNumberSmoothUp(snes,n_up);CHKERRQ(ierr); 298 } 299 if (downflg) { 300 ierr = SNESFASSetNumberSmoothDown(snes,n_down);CHKERRQ(ierr); 301 } 302 303 /* set up the default line search for coarse grid corrections */ 304 if (fas->fastype == SNES_FAS_ADDITIVE) { 305 if (!snes->linesearch) { 306 ierr = SNESGetLineSearch(snes, &linesearch);CHKERRQ(ierr); 307 ierr = SNESLineSearchSetType(linesearch, SNESLINESEARCHL2);CHKERRQ(ierr); 308 } 309 } 310 311 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 312 /* recursive option setting for the smoothers */ 313 if (next) {ierr = SNESSetFromOptions(next);CHKERRQ(ierr);} 314 PetscFunctionReturn(0); 315 } 316 317 #include <petscdraw.h> 318 #undef __FUNCT__ 319 #define __FUNCT__ "SNESView_FAS" 320 static PetscErrorCode SNESView_FAS(SNES snes, PetscViewer viewer) 321 { 322 SNES_FAS *fas = (SNES_FAS*) snes->data; 323 PetscBool isFine,iascii,isdraw; 324 PetscInt i; 325 PetscErrorCode ierr; 326 SNES smoothu, smoothd, levelsnes; 327 328 PetscFunctionBegin; 329 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 330 if (isFine) { 331 ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&iascii);CHKERRQ(ierr); 332 ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERDRAW,&isdraw);CHKERRQ(ierr); 333 if (iascii) { 334 ierr = PetscViewerASCIIPrintf(viewer, "FAS: type is %s, levels=%D, cycles=%D\n", SNESFASTypes[fas->fastype], fas->levels, fas->n_cycles);CHKERRQ(ierr); 335 if (fas->galerkin) { 336 ierr = PetscViewerASCIIPrintf(viewer," Using Galerkin computed coarse grid function evaluation\n");CHKERRQ(ierr); 337 } else { 338 ierr = PetscViewerASCIIPrintf(viewer," Not using Galerkin computed coarse grid function evaluation\n");CHKERRQ(ierr); 339 } 340 for (i=0; i<fas->levels; i++) { 341 ierr = SNESFASGetCycleSNES(snes, i, &levelsnes);CHKERRQ(ierr); 342 ierr = SNESFASCycleGetSmootherUp(levelsnes, &smoothu);CHKERRQ(ierr); 343 ierr = SNESFASCycleGetSmootherDown(levelsnes, &smoothd);CHKERRQ(ierr); 344 if (!i) { 345 ierr = PetscViewerASCIIPrintf(viewer,"Coarse grid solver -- level %D -------------------------------\n",i);CHKERRQ(ierr); 346 } else { 347 ierr = PetscViewerASCIIPrintf(viewer,"Down solver (pre-smoother) on level %D -------------------------------\n",i);CHKERRQ(ierr); 348 } 349 ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr); 350 if (smoothd) { 351 ierr = SNESView(smoothd,viewer);CHKERRQ(ierr); 352 } else { 353 ierr = PetscViewerASCIIPrintf(viewer,"Not yet available\n");CHKERRQ(ierr); 354 } 355 ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr); 356 if (i && (smoothd == smoothu)) { 357 ierr = PetscViewerASCIIPrintf(viewer,"Up solver (post-smoother) same as down solver (pre-smoother)\n");CHKERRQ(ierr); 358 } else if (i) { 359 ierr = PetscViewerASCIIPrintf(viewer,"Up solver (post-smoother) on level %D -------------------------------\n",i);CHKERRQ(ierr); 360 ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr); 361 if (smoothu) { 362 ierr = SNESView(smoothu,viewer);CHKERRQ(ierr); 363 } else { 364 ierr = PetscViewerASCIIPrintf(viewer,"Not yet available\n");CHKERRQ(ierr); 365 } 366 ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr); 367 } 368 } 369 } else if (isdraw) { 370 PetscDraw draw; 371 PetscReal x,w,y,bottom,th,wth; 372 SNES_FAS *curfas = fas; 373 ierr = PetscViewerDrawGetDraw(viewer,0,&draw);CHKERRQ(ierr); 374 ierr = PetscDrawGetCurrentPoint(draw,&x,&y);CHKERRQ(ierr); 375 ierr = PetscDrawStringGetSize(draw,&wth,&th);CHKERRQ(ierr); 376 bottom = y - th; 377 while (curfas) { 378 if (!curfas->smoothu) { 379 ierr = PetscDrawPushCurrentPoint(draw,x,bottom);CHKERRQ(ierr); 380 if (curfas->smoothd) ierr = SNESView(curfas->smoothd,viewer);CHKERRQ(ierr); 381 ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr); 382 } else { 383 w = 0.5*PetscMin(1.0-x,x); 384 ierr = PetscDrawPushCurrentPoint(draw,x-w,bottom);CHKERRQ(ierr); 385 if (curfas->smoothd) ierr = SNESView(curfas->smoothd,viewer);CHKERRQ(ierr); 386 ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr); 387 ierr = PetscDrawPushCurrentPoint(draw,x+w,bottom);CHKERRQ(ierr); 388 if (curfas->smoothu) ierr = SNESView(curfas->smoothu,viewer);CHKERRQ(ierr); 389 ierr = PetscDrawPopCurrentPoint(draw);CHKERRQ(ierr); 390 } 391 /* this is totally bogus but we have no way of knowing how low the previous one was draw to */ 392 bottom -= 5*th; 393 if (curfas->next) curfas = (SNES_FAS*)curfas->next->data; 394 else curfas = NULL; 395 } 396 } 397 } 398 PetscFunctionReturn(0); 399 } 400 401 #undef __FUNCT__ 402 #define __FUNCT__ "SNESFASDownSmooth_Private" 403 /* 404 Defines the action of the downsmoother 405 */ 406 static PetscErrorCode SNESFASDownSmooth_Private(SNES snes, Vec B, Vec X, Vec F, PetscReal *fnorm) 407 { 408 PetscErrorCode ierr = 0; 409 SNESConvergedReason reason; 410 Vec FPC; 411 SNES smoothd; 412 SNES_FAS *fas = (SNES_FAS*) snes->data; 413 414 PetscFunctionBegin; 415 ierr = SNESFASCycleGetSmootherDown(snes, &smoothd);CHKERRQ(ierr); 416 ierr = SNESSetInitialFunction(smoothd, F);CHKERRQ(ierr); 417 if (fas->eventsmoothsolve) {ierr = PetscLogEventBegin(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 418 ierr = SNESSolve(smoothd, B, X);CHKERRQ(ierr); 419 if (fas->eventsmoothsolve) {ierr = PetscLogEventEnd(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 420 /* check convergence reason for the smoother */ 421 ierr = SNESGetConvergedReason(smoothd,&reason);CHKERRQ(ierr); 422 if (reason < 0 && !(reason == SNES_DIVERGED_MAX_IT || reason == SNES_DIVERGED_LOCAL_MIN || reason == SNES_DIVERGED_LINE_SEARCH)) { 423 snes->reason = SNES_DIVERGED_INNER; 424 PetscFunctionReturn(0); 425 } 426 ierr = SNESGetFunction(smoothd, &FPC, NULL, NULL);CHKERRQ(ierr); 427 ierr = VecCopy(FPC, F);CHKERRQ(ierr); 428 if (fnorm) {ierr = VecNorm(F,NORM_2,fnorm);CHKERRQ(ierr);} 429 PetscFunctionReturn(0); 430 } 431 432 433 #undef __FUNCT__ 434 #define __FUNCT__ "SNESFASUpSmooth_Private" 435 /* 436 Defines the action of the upsmoother 437 */ 438 static PetscErrorCode SNESFASUpSmooth_Private(SNES snes, Vec B, Vec X, Vec F, PetscReal *fnorm) 439 { 440 PetscErrorCode ierr = 0; 441 SNESConvergedReason reason; 442 Vec FPC; 443 SNES smoothu; 444 SNES_FAS *fas = (SNES_FAS*) snes->data; 445 446 PetscFunctionBegin; 447 ierr = SNESFASCycleGetSmootherUp(snes, &smoothu);CHKERRQ(ierr); 448 if (fas->eventsmoothsolve) {ierr = PetscLogEventBegin(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 449 ierr = SNESSolve(smoothu, B, X);CHKERRQ(ierr); 450 if (fas->eventsmoothsolve) {ierr = PetscLogEventEnd(fas->eventsmoothsolve,0,0,0,0);CHKERRQ(ierr);} 451 /* check convergence reason for the smoother */ 452 ierr = SNESGetConvergedReason(smoothu,&reason);CHKERRQ(ierr); 453 if (reason < 0 && !(reason == SNES_DIVERGED_MAX_IT || reason == SNES_DIVERGED_LOCAL_MIN || reason == SNES_DIVERGED_LINE_SEARCH)) { 454 snes->reason = SNES_DIVERGED_INNER; 455 PetscFunctionReturn(0); 456 } 457 ierr = SNESGetFunction(smoothu, &FPC, NULL, NULL);CHKERRQ(ierr); 458 ierr = VecCopy(FPC, F);CHKERRQ(ierr); 459 if (fnorm) {ierr = VecNorm(F,NORM_2,fnorm);CHKERRQ(ierr);} 460 PetscFunctionReturn(0); 461 } 462 463 #undef __FUNCT__ 464 #define __FUNCT__ "SNESFASCreateCoarseVec" 465 /*@ 466 SNESFASCreateCoarseVec - create Vec corresponding to a state vector on one level coarser than current level 467 468 Collective 469 470 Input Arguments: 471 . snes - SNESFAS 472 473 Output Arguments: 474 . Xcoarse - vector on level one coarser than snes 475 476 Level: developer 477 478 .seealso: SNESFASSetRestriction(), SNESFASRestrict() 479 @*/ 480 PetscErrorCode SNESFASCreateCoarseVec(SNES snes,Vec *Xcoarse) 481 { 482 PetscErrorCode ierr; 483 SNES_FAS *fas = (SNES_FAS*)snes->data; 484 485 PetscFunctionBegin; 486 if (fas->rscale) { 487 ierr = VecDuplicate(fas->rscale,Xcoarse);CHKERRQ(ierr); 488 } else if (fas->inject) { 489 ierr = MatCreateVecs(fas->inject,Xcoarse,NULL);CHKERRQ(ierr); 490 } else SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE,"Must set restriction or injection");CHKERRQ(ierr); 491 PetscFunctionReturn(0); 492 } 493 494 #undef __FUNCT__ 495 #define __FUNCT__ "SNESFASRestrict" 496 /*@ 497 SNESFASRestrict - restrict a Vec to the next coarser level 498 499 Collective 500 501 Input Arguments: 502 + fine - SNES from which to restrict 503 - Xfine - vector to restrict 504 505 Output Arguments: 506 . Xcoarse - result of restriction 507 508 Level: developer 509 510 .seealso: SNESFASSetRestriction(), SNESFASSetInjection() 511 @*/ 512 PetscErrorCode SNESFASRestrict(SNES fine,Vec Xfine,Vec Xcoarse) 513 { 514 PetscErrorCode ierr; 515 SNES_FAS *fas = (SNES_FAS*)fine->data; 516 517 PetscFunctionBegin; 518 PetscValidHeaderSpecific(fine,SNES_CLASSID,1); 519 PetscValidHeaderSpecific(Xfine,VEC_CLASSID,2); 520 PetscValidHeaderSpecific(Xcoarse,VEC_CLASSID,3); 521 if (fas->inject) { 522 ierr = MatRestrict(fas->inject,Xfine,Xcoarse);CHKERRQ(ierr); 523 } else { 524 ierr = MatRestrict(fas->restrct,Xfine,Xcoarse);CHKERRQ(ierr); 525 ierr = VecPointwiseMult(Xcoarse,fas->rscale,Xcoarse);CHKERRQ(ierr); 526 } 527 PetscFunctionReturn(0); 528 } 529 530 #undef __FUNCT__ 531 #define __FUNCT__ "SNESFASCoarseCorrection" 532 /* 533 534 Performs the FAS coarse correction as: 535 536 fine problem: F(x) = b 537 coarse problem: F^c(x^c) = b^c 538 539 b^c = F^c(Rx) - R(F(x) - b) 540 541 */ 542 PetscErrorCode SNESFASCoarseCorrection(SNES snes, Vec X, Vec F, Vec X_new) 543 { 544 PetscErrorCode ierr; 545 Vec X_c, Xo_c, F_c, B_c; 546 SNESConvergedReason reason; 547 SNES next; 548 Mat restrct, interpolate; 549 SNES_FAS *fasc; 550 551 PetscFunctionBegin; 552 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 553 if (next) { 554 fasc = (SNES_FAS*)next->data; 555 556 ierr = SNESFASCycleGetRestriction(snes, &restrct);CHKERRQ(ierr); 557 ierr = SNESFASCycleGetInterpolation(snes, &interpolate);CHKERRQ(ierr); 558 559 X_c = next->vec_sol; 560 Xo_c = next->work[0]; 561 F_c = next->vec_func; 562 B_c = next->vec_rhs; 563 564 if (fasc->eventinterprestrict) {ierr = PetscLogEventBegin(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 565 ierr = SNESFASRestrict(snes,X,Xo_c);CHKERRQ(ierr); 566 /* restrict the defect: R(F(x) - b) */ 567 ierr = MatRestrict(restrct, F, B_c);CHKERRQ(ierr); 568 if (fasc->eventinterprestrict) {ierr = PetscLogEventEnd(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 569 570 if (fasc->eventresidual) {ierr = PetscLogEventBegin(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 571 /* F_c = F^c(Rx) - R(F(x) - b) since the second term was sitting in next->vec_rhs */ 572 ierr = SNESComputeFunction(next, Xo_c, F_c);CHKERRQ(ierr); 573 if (fasc->eventresidual) {ierr = PetscLogEventEnd(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 574 575 /* solve the coarse problem corresponding to F^c(x^c) = b^c = F^c(Rx) - R(F(x) - b) */ 576 ierr = VecCopy(B_c, X_c);CHKERRQ(ierr); 577 ierr = VecCopy(F_c, B_c);CHKERRQ(ierr); 578 ierr = VecCopy(X_c, F_c);CHKERRQ(ierr); 579 /* set initial guess of the coarse problem to the projected fine solution */ 580 ierr = VecCopy(Xo_c, X_c);CHKERRQ(ierr); 581 582 /* recurse to the next level */ 583 ierr = SNESSetInitialFunction(next, F_c);CHKERRQ(ierr); 584 ierr = SNESSolve(next, B_c, X_c);CHKERRQ(ierr); 585 ierr = SNESGetConvergedReason(next,&reason);CHKERRQ(ierr); 586 if (reason < 0 && reason != SNES_DIVERGED_MAX_IT) { 587 snes->reason = SNES_DIVERGED_INNER; 588 PetscFunctionReturn(0); 589 } 590 /* correct as x <- x + I(x^c - Rx)*/ 591 ierr = VecAXPY(X_c, -1.0, Xo_c);CHKERRQ(ierr); 592 593 if (fasc->eventinterprestrict) {ierr = PetscLogEventBegin(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 594 ierr = MatInterpolateAdd(interpolate, X_c, X, X_new);CHKERRQ(ierr); 595 if (fasc->eventinterprestrict) {ierr = PetscLogEventEnd(fasc->eventinterprestrict,0,0,0,0);CHKERRQ(ierr);} 596 } 597 PetscFunctionReturn(0); 598 } 599 600 #undef __FUNCT__ 601 #define __FUNCT__ "SNESFASCycle_Additive" 602 /* 603 604 The additive cycle looks like: 605 606 xhat = x 607 xhat = dS(x, b) 608 x = coarsecorrection(xhat, b_d) 609 x = x + nu*(xhat - x); 610 (optional) x = uS(x, b) 611 612 With the coarse RHS (defect correction) as below. 613 614 */ 615 static PetscErrorCode SNESFASCycle_Additive(SNES snes, Vec X) 616 { 617 Vec F, B, Xhat; 618 Vec X_c, Xo_c, F_c, B_c; 619 PetscErrorCode ierr; 620 SNESConvergedReason reason; 621 PetscReal xnorm, fnorm, ynorm; 622 SNESLineSearchReason lsresult; 623 SNES next; 624 Mat restrct, interpolate; 625 SNES_FAS *fas = (SNES_FAS*)snes->data,*fasc; 626 627 PetscFunctionBegin; 628 ierr = SNESFASCycleGetCorrection(snes, &next);CHKERRQ(ierr); 629 F = snes->vec_func; 630 B = snes->vec_rhs; 631 Xhat = snes->work[1]; 632 ierr = VecCopy(X, Xhat);CHKERRQ(ierr); 633 /* recurse first */ 634 if (next) { 635 fasc = (SNES_FAS*)next->data; 636 ierr = SNESFASCycleGetRestriction(snes, &restrct);CHKERRQ(ierr); 637 ierr = SNESFASCycleGetInterpolation(snes, &interpolate);CHKERRQ(ierr); 638 if (fas->eventresidual) {ierr = PetscLogEventBegin(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 639 ierr = SNESComputeFunction(snes, Xhat, F);CHKERRQ(ierr); 640 if (fas->eventresidual) {ierr = PetscLogEventEnd(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 641 ierr = VecNorm(F, NORM_2, &fnorm);CHKERRQ(ierr); 642 X_c = next->vec_sol; 643 Xo_c = next->work[0]; 644 F_c = next->vec_func; 645 B_c = next->vec_rhs; 646 647 ierr = SNESFASRestrict(snes,Xhat,Xo_c);CHKERRQ(ierr); 648 /* restrict the defect */ 649 ierr = MatRestrict(restrct, F, B_c);CHKERRQ(ierr); 650 651 /* solve the coarse problem corresponding to F^c(x^c) = b^c = Rb + F^c(Rx) - RF(x) */ 652 if (fasc->eventresidual) {ierr = PetscLogEventBegin(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 653 ierr = SNESComputeFunction(next, Xo_c, F_c);CHKERRQ(ierr); 654 if (fasc->eventresidual) {ierr = PetscLogEventEnd(fasc->eventresidual,0,0,0,0);CHKERRQ(ierr);} 655 ierr = VecCopy(B_c, X_c);CHKERRQ(ierr); 656 ierr = VecCopy(F_c, B_c);CHKERRQ(ierr); 657 ierr = VecCopy(X_c, F_c);CHKERRQ(ierr); 658 /* set initial guess of the coarse problem to the projected fine solution */ 659 ierr = VecCopy(Xo_c, X_c);CHKERRQ(ierr); 660 661 /* recurse */ 662 ierr = SNESSetInitialFunction(next, F_c);CHKERRQ(ierr); 663 ierr = SNESSolve(next, B_c, X_c);CHKERRQ(ierr); 664 665 /* smooth on this level */ 666 ierr = SNESFASDownSmooth_Private(snes, B, X, F, &fnorm);CHKERRQ(ierr); 667 668 ierr = SNESGetConvergedReason(next,&reason);CHKERRQ(ierr); 669 if (reason < 0 && reason != SNES_DIVERGED_MAX_IT) { 670 snes->reason = SNES_DIVERGED_INNER; 671 PetscFunctionReturn(0); 672 } 673 674 /* correct as x <- x + I(x^c - Rx)*/ 675 ierr = VecAYPX(X_c, -1.0, Xo_c);CHKERRQ(ierr); 676 ierr = MatInterpolate(interpolate, X_c, Xhat);CHKERRQ(ierr); 677 678 /* additive correction of the coarse direction*/ 679 ierr = SNESLineSearchApply(snes->linesearch, X, F, &fnorm, Xhat);CHKERRQ(ierr); 680 ierr = SNESLineSearchGetReason(snes->linesearch, &lsresult);CHKERRQ(ierr); 681 ierr = SNESLineSearchGetNorms(snes->linesearch, &xnorm, &snes->norm, &ynorm);CHKERRQ(ierr); 682 if (lsresult) { 683 if (++snes->numFailures >= snes->maxFailures) { 684 snes->reason = SNES_DIVERGED_LINE_SEARCH; 685 PetscFunctionReturn(0); 686 } 687 } 688 } else { 689 ierr = SNESFASDownSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr); 690 } 691 PetscFunctionReturn(0); 692 } 693 694 #undef __FUNCT__ 695 #define __FUNCT__ "SNESFASCycle_Multiplicative" 696 /* 697 698 Defines the FAS cycle as: 699 700 fine problem: F(x) = b 701 coarse problem: F^c(x) = b^c 702 703 b^c = F^c(Rx) - R(F(x) - b) 704 705 correction: 706 707 x = x + I(x^c - Rx) 708 709 */ 710 static PetscErrorCode SNESFASCycle_Multiplicative(SNES snes, Vec X) 711 { 712 713 PetscErrorCode ierr; 714 Vec F,B; 715 SNES next; 716 717 PetscFunctionBegin; 718 F = snes->vec_func; 719 B = snes->vec_rhs; 720 /* pre-smooth -- just update using the pre-smoother */ 721 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 722 ierr = SNESFASDownSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr); 723 if (next) { 724 ierr = SNESFASCoarseCorrection(snes, X, F, X);CHKERRQ(ierr); 725 ierr = SNESFASUpSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr); 726 } 727 PetscFunctionReturn(0); 728 } 729 730 #undef __FUNCT__ 731 #define __FUNCT__ "SNESFASCycleSetupPhase_Full" 732 static PetscErrorCode SNESFASCycleSetupPhase_Full(SNES snes) 733 { 734 SNES next; 735 SNES_FAS *fas = (SNES_FAS*)snes->data; 736 PetscBool isFine; 737 PetscErrorCode ierr; 738 739 PetscFunctionBegin; 740 /* pre-smooth -- just update using the pre-smoother */ 741 ierr = SNESFASCycleIsFine(snes,&isFine);CHKERRQ(ierr); 742 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 743 fas->full_stage = 0; 744 if (next) {ierr = SNESFASCycleSetupPhase_Full(next);CHKERRQ(ierr);} 745 PetscFunctionReturn(0); 746 } 747 748 #undef __FUNCT__ 749 #define __FUNCT__ "SNESFASCycle_Full" 750 static PetscErrorCode SNESFASCycle_Full(SNES snes, Vec X) 751 { 752 PetscErrorCode ierr; 753 Vec F,B; 754 SNES_FAS *fas = (SNES_FAS*)snes->data; 755 PetscBool isFine; 756 SNES next; 757 758 PetscFunctionBegin; 759 F = snes->vec_func; 760 B = snes->vec_rhs; 761 ierr = SNESFASCycleIsFine(snes,&isFine);CHKERRQ(ierr); 762 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 763 764 if (isFine) { 765 ierr = SNESFASCycleSetupPhase_Full(snes);CHKERRQ(ierr); 766 } 767 768 if (fas->full_stage == 0) { 769 /* downsweep */ 770 if (next) { 771 if (fas->level != 1) next->max_its += 1; 772 if (fas->full_downsweep||isFine) {ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);} 773 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 774 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 775 if (fas->level != 1) next->max_its -= 1; 776 } else { 777 /* The smoother on the coarse level is the coarse solver */ 778 ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 779 } 780 fas->full_stage = 1; 781 } else if (fas->full_stage == 1) { 782 if (snes->iter == 0) {ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);} 783 if (next) { 784 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 785 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 786 } 787 } 788 /* final v-cycle */ 789 if (isFine) { 790 if (next) { 791 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 792 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 793 } 794 } 795 PetscFunctionReturn(0); 796 } 797 798 #undef __FUNCT__ 799 #define __FUNCT__ "SNESFASCycle_Kaskade" 800 static PetscErrorCode SNESFASCycle_Kaskade(SNES snes, Vec X) 801 { 802 PetscErrorCode ierr; 803 Vec F,B; 804 SNES next; 805 806 PetscFunctionBegin; 807 F = snes->vec_func; 808 B = snes->vec_rhs; 809 ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr); 810 if (next) { 811 ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr); 812 ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 813 } else { 814 ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr); 815 } 816 PetscFunctionReturn(0); 817 } 818 819 PetscBool SNEScite = PETSC_FALSE; 820 const char SNESCitation[] = "@techreport{pbmkbsxt2012,\n" 821 " title = {Composing Scalable Nonlinear Algebraic Solvers},\n" 822 " author = {Peter Brune and Mathew Knepley and Barry Smith and Xuemin Tu},\n" 823 " year = 2013,\n" 824 " type = Preprint,\n" 825 " number = {ANL/MCS-P2010-0112},\n" 826 " institution = {Argonne National Laboratory}\n}\n"; 827 828 #undef __FUNCT__ 829 #define __FUNCT__ "SNESSolve_FAS" 830 static PetscErrorCode SNESSolve_FAS(SNES snes) 831 { 832 PetscErrorCode ierr; 833 PetscInt i, maxits; 834 Vec X, F; 835 PetscReal fnorm; 836 SNES_FAS *fas = (SNES_FAS*)snes->data,*ffas; 837 DM dm; 838 PetscBool isFine; 839 840 PetscFunctionBegin; 841 842 if (snes->xl || snes->xu || snes->ops->computevariablebounds) SETERRQ1(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE, "SNES solver %s does not support bounds", ((PetscObject)snes)->type_name); 843 844 ierr = PetscCitationsRegister(SNESCitation,&SNEScite);CHKERRQ(ierr); 845 maxits = snes->max_its; /* maximum number of iterations */ 846 snes->reason = SNES_CONVERGED_ITERATING; 847 X = snes->vec_sol; 848 F = snes->vec_func; 849 850 ierr = SNESFASCycleIsFine(snes, &isFine);CHKERRQ(ierr); 851 /*norm setup */ 852 ierr = PetscObjectSAWsTakeAccess((PetscObject)snes);CHKERRQ(ierr); 853 snes->iter = 0; 854 snes->norm = 0.; 855 ierr = PetscObjectSAWsGrantAccess((PetscObject)snes);CHKERRQ(ierr); 856 if (!snes->vec_func_init_set) { 857 if (fas->eventresidual) {ierr = PetscLogEventBegin(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 858 ierr = SNESComputeFunction(snes,X,F);CHKERRQ(ierr); 859 if (fas->eventresidual) {ierr = PetscLogEventEnd(fas->eventresidual,0,0,0,0);CHKERRQ(ierr);} 860 } else snes->vec_func_init_set = PETSC_FALSE; 861 862 ierr = VecNorm(F, NORM_2, &fnorm);CHKERRQ(ierr); /* fnorm <- ||F|| */ 863 SNESCheckFunctionNorm(snes,fnorm); 864 ierr = PetscObjectSAWsTakeAccess((PetscObject)snes);CHKERRQ(ierr); 865 snes->norm = fnorm; 866 ierr = PetscObjectSAWsGrantAccess((PetscObject)snes);CHKERRQ(ierr); 867 ierr = SNESLogConvergenceHistory(snes,fnorm,0);CHKERRQ(ierr); 868 ierr = SNESMonitor(snes,0,fnorm);CHKERRQ(ierr); 869 870 /* test convergence */ 871 ierr = (*snes->ops->converged)(snes,0,0.0,0.0,fnorm,&snes->reason,snes->cnvP);CHKERRQ(ierr); 872 if (snes->reason) PetscFunctionReturn(0); 873 874 875 if (isFine) { 876 /* propagate scale-dependent data up the hierarchy */ 877 ierr = SNESGetDM(snes,&dm);CHKERRQ(ierr); 878 for (ffas=fas; ffas->next; ffas=(SNES_FAS*)ffas->next->data) { 879 DM dmcoarse; 880 ierr = SNESGetDM(ffas->next,&dmcoarse);CHKERRQ(ierr); 881 ierr = DMRestrict(dm,ffas->restrct,ffas->rscale,ffas->inject,dmcoarse);CHKERRQ(ierr); 882 dm = dmcoarse; 883 } 884 } 885 886 for (i = 0; i < maxits; i++) { 887 /* Call general purpose update function */ 888 889 if (snes->ops->update) { 890 ierr = (*snes->ops->update)(snes, snes->iter);CHKERRQ(ierr); 891 } 892 if (fas->fastype == SNES_FAS_MULTIPLICATIVE) { 893 ierr = SNESFASCycle_Multiplicative(snes, X);CHKERRQ(ierr); 894 } else if (fas->fastype == SNES_FAS_ADDITIVE) { 895 ierr = SNESFASCycle_Additive(snes, X);CHKERRQ(ierr); 896 } else if (fas->fastype == SNES_FAS_FULL) { 897 ierr = SNESFASCycle_Full(snes, X);CHKERRQ(ierr); 898 } else if (fas->fastype ==SNES_FAS_KASKADE) { 899 ierr = SNESFASCycle_Kaskade(snes, X);CHKERRQ(ierr); 900 } else SETERRQ(PetscObjectComm((PetscObject)snes),PETSC_ERR_ARG_WRONGSTATE,"Unsupported FAS type"); 901 902 /* check for FAS cycle divergence */ 903 if (snes->reason != SNES_CONVERGED_ITERATING) PetscFunctionReturn(0); 904 905 /* Monitor convergence */ 906 ierr = PetscObjectSAWsTakeAccess((PetscObject)snes);CHKERRQ(ierr); 907 snes->iter = i+1; 908 ierr = PetscObjectSAWsGrantAccess((PetscObject)snes);CHKERRQ(ierr); 909 ierr = SNESLogConvergenceHistory(snes,snes->norm,0);CHKERRQ(ierr); 910 ierr = SNESMonitor(snes,snes->iter,snes->norm);CHKERRQ(ierr); 911 /* Test for convergence */ 912 if (isFine) { 913 ierr = (*snes->ops->converged)(snes,snes->iter,0.0,0.0,snes->norm,&snes->reason,snes->cnvP);CHKERRQ(ierr); 914 if (snes->reason) break; 915 } 916 } 917 if (i == maxits) { 918 ierr = PetscInfo1(snes, "Maximum number of iterations has been reached: %D\n", maxits);CHKERRQ(ierr); 919 if (!snes->reason) snes->reason = SNES_DIVERGED_MAX_IT; 920 } 921 PetscFunctionReturn(0); 922 } 923 924 /*MC 925 926 SNESFAS - Full Approximation Scheme nonlinear multigrid solver. 927 928 The nonlinear problem is solved by correction using coarse versions 929 of the nonlinear problem. This problem is perturbed so that a projected 930 solution of the fine problem elicits no correction from the coarse problem. 931 932 Options Database: 933 + -snes_fas_levels - The number of levels 934 . -snes_fas_cycles<1> - The number of cycles -- 1 for V, 2 for W 935 . -snes_fas_type<additive,multiplicative,full,kaskade> - Additive or multiplicative cycle 936 . -snes_fas_galerkin<PETSC_FALSE> - Form coarse problems by projection back upon the fine problem 937 . -snes_fas_smoothup<1> - The number of iterations of the post-smoother 938 . -snes_fas_smoothdown<1> - The number of iterations of the pre-smoother 939 . -snes_fas_monitor - Monitor progress of all of the levels 940 . -snes_fas_full_downsweep<PETSC_FALSE> - call the downsmooth on the initial downsweep of full FAS 941 . -fas_levels_snes_ - SNES options for all smoothers 942 . -fas_levels_cycle_snes_ - SNES options for all cycles 943 . -fas_levels_i_snes_ - SNES options for the smoothers on level i 944 . -fas_levels_i_cycle_snes_ - SNES options for the cycle on level i 945 - -fas_coarse_snes_ - SNES options for the coarsest smoother 946 947 Notes: 948 The organization of the FAS solver is slightly different from the organization of PCMG 949 As each level has smoother SNES instances(down and potentially up) and a cycle SNES instance. 950 The cycle SNES instance may be used for monitoring convergence on a particular level. 951 952 Level: beginner 953 954 References: 955 . 1. - Peter R. Brune, Matthew G. Knepley, Barry F. Smith, and Xuemin Tu, "Composing Scalable Nonlinear Algebraic Solvers", 956 SIAM Review, 57(4), 2015 957 958 .seealso: PCMG, SNESCreate(), SNES, SNESSetType(), SNESType (for list of available types) 959 M*/ 960 961 #undef __FUNCT__ 962 #define __FUNCT__ "SNESCreate_FAS" 963 PETSC_EXTERN PetscErrorCode SNESCreate_FAS(SNES snes) 964 { 965 SNES_FAS *fas; 966 PetscErrorCode ierr; 967 968 PetscFunctionBegin; 969 snes->ops->destroy = SNESDestroy_FAS; 970 snes->ops->setup = SNESSetUp_FAS; 971 snes->ops->setfromoptions = SNESSetFromOptions_FAS; 972 snes->ops->view = SNESView_FAS; 973 snes->ops->solve = SNESSolve_FAS; 974 snes->ops->reset = SNESReset_FAS; 975 976 snes->usesksp = PETSC_FALSE; 977 snes->usespc = PETSC_FALSE; 978 979 if (!snes->tolerancesset) { 980 snes->max_funcs = 30000; 981 snes->max_its = 10000; 982 } 983 984 snes->alwayscomputesfinalresidual = PETSC_TRUE; 985 986 ierr = PetscNewLog(snes,&fas);CHKERRQ(ierr); 987 988 snes->data = (void*) fas; 989 fas->level = 0; 990 fas->levels = 1; 991 fas->n_cycles = 1; 992 fas->max_up_it = 1; 993 fas->max_down_it = 1; 994 fas->smoothu = NULL; 995 fas->smoothd = NULL; 996 fas->next = NULL; 997 fas->previous = NULL; 998 fas->fine = snes; 999 fas->interpolate = NULL; 1000 fas->restrct = NULL; 1001 fas->inject = NULL; 1002 fas->usedmfornumberoflevels = PETSC_FALSE; 1003 fas->fastype = SNES_FAS_MULTIPLICATIVE; 1004 fas->full_downsweep = PETSC_FALSE; 1005 1006 fas->eventsmoothsetup = 0; 1007 fas->eventsmoothsolve = 0; 1008 fas->eventresidual = 0; 1009 fas->eventinterprestrict = 0; 1010 PetscFunctionReturn(0); 1011 } 1012