1 #define PETSCKSP_DLL 2 /* 3 Routines to set PC methods and options. 4 */ 5 6 #include "private/pcimpl.h" /*I "petscpc.h" I*/ 7 8 PetscTruth PCRegisterAllCalled = PETSC_FALSE; 9 /* 10 Contains the list of registered KSP routines 11 */ 12 PetscFList PCList = 0; 13 14 #undef __FUNCT__ 15 #define __FUNCT__ "PCSetType" 16 /*@C 17 PCSetType - Builds PC for a particular preconditioner. 18 19 Collective on PC 20 21 Input Parameter: 22 + pc - the preconditioner context. 23 - type - a known method 24 25 Options Database Key: 26 . -pc_type <type> - Sets PC type 27 28 Use -help for a list of available methods (for instance, 29 jacobi or bjacobi) 30 31 Notes: 32 See "petsc/include/petscpc.h" for available methods (for instance, 33 PCJACOBI, PCILU, or PCBJACOBI). 34 35 Normally, it is best to use the KSPSetFromOptions() command and 36 then set the PC type from the options database rather than by using 37 this routine. Using the options database provides the user with 38 maximum flexibility in evaluating the many different preconditioners. 39 The PCSetType() routine is provided for those situations where it 40 is necessary to set the preconditioner independently of the command 41 line or options database. This might be the case, for example, when 42 the choice of preconditioner changes during the execution of the 43 program, and the user's application is taking responsibility for 44 choosing the appropriate preconditioner. In other words, this 45 routine is not for beginners. 46 47 Level: intermediate 48 49 .keywords: PC, set, method, type 50 51 .seealso: KSPSetType(), PCType 52 53 @*/ 54 PetscErrorCode PETSCKSP_DLLEXPORT PCSetType(PC pc,const PCType type) 55 { 56 PetscErrorCode ierr,(*r)(PC); 57 PetscTruth match; 58 59 PetscFunctionBegin; 60 PetscValidHeaderSpecific(pc,PC_COOKIE,1); 61 PetscValidCharPointer(type,2); 62 63 ierr = PetscTypeCompare((PetscObject)pc,type,&match);CHKERRQ(ierr); 64 if (match) PetscFunctionReturn(0); 65 66 ierr = PetscFListFind(PCList,((PetscObject)pc)->comm,type,(void (**)(void)) &r);CHKERRQ(ierr); 67 if (!r) SETERRQ1(PETSC_ERR_ARG_UNKNOWN_TYPE,"Unable to find requested PC type %s",type); 68 /* Destroy the previous private PC context */ 69 if (pc->ops->destroy) { ierr = (*pc->ops->destroy)(pc);CHKERRQ(ierr); pc->data = 0;} 70 ierr = PetscFListDestroy(&((PetscObject)pc)->qlist);CHKERRQ(ierr); 71 /* Reinitialize function pointers in PCOps structure */ 72 ierr = PetscMemzero(pc->ops,sizeof(struct _PCOps));CHKERRQ(ierr); 73 /* XXX Is this OK?? */ 74 pc->modifysubmatrices = 0; 75 pc->modifysubmatricesP = 0; 76 /* Call the PCCreate_XXX routine for this particular preconditioner */ 77 pc->setupcalled = 0; 78 ierr = (*r)(pc);CHKERRQ(ierr); 79 ierr = PetscObjectChangeTypeName((PetscObject)pc,type);CHKERRQ(ierr); 80 PetscFunctionReturn(0); 81 } 82 83 #undef __FUNCT__ 84 #define __FUNCT__ "PCRegisterDestroy" 85 /*@ 86 PCRegisterDestroy - Frees the list of preconditioners that were 87 registered by PCRegisterDynamic(). 88 89 Not Collective 90 91 Level: advanced 92 93 .keywords: PC, register, destroy 94 95 .seealso: PCRegisterAll(), PCRegisterAll() 96 97 @*/ 98 PetscErrorCode PETSCKSP_DLLEXPORT PCRegisterDestroy(void) 99 { 100 PetscErrorCode ierr; 101 102 PetscFunctionBegin; 103 ierr = PetscFListDestroy(&PCList);CHKERRQ(ierr); 104 PCRegisterAllCalled = PETSC_FALSE; 105 PetscFunctionReturn(0); 106 } 107 108 #undef __FUNCT__ 109 #define __FUNCT__ "PCGetType" 110 /*@C 111 PCGetType - Gets the PC method type and name (as a string) from the PC 112 context. 113 114 Not Collective 115 116 Input Parameter: 117 . pc - the preconditioner context 118 119 Output Parameter: 120 . type - name of preconditioner method 121 122 Level: intermediate 123 124 .keywords: PC, get, method, name, type 125 126 .seealso: PCSetType() 127 128 @*/ 129 PetscErrorCode PETSCKSP_DLLEXPORT PCGetType(PC pc,const PCType *type) 130 { 131 PetscFunctionBegin; 132 PetscValidHeaderSpecific(pc,PC_COOKIE,1); 133 PetscValidPointer(type,2); 134 *type = ((PetscObject)pc)->type_name; 135 PetscFunctionReturn(0); 136 } 137 138 EXTERN PetscErrorCode PCGetDefaultType_Private(PC,const char*[]); 139 140 #undef __FUNCT__ 141 #define __FUNCT__ "PCSetFromOptions" 142 /*@ 143 PCSetFromOptions - Sets PC options from the options database. 144 This routine must be called before PCSetUp() if the user is to be 145 allowed to set the preconditioner method. 146 147 Collective on PC 148 149 Input Parameter: 150 . pc - the preconditioner context 151 152 Level: developer 153 154 .keywords: PC, set, from, options, database 155 156 .seealso: 157 158 @*/ 159 PetscErrorCode PETSCKSP_DLLEXPORT PCSetFromOptions(PC pc) 160 { 161 PetscErrorCode ierr; 162 char type[256]; 163 const char *def; 164 PetscTruth flg; 165 166 PetscFunctionBegin; 167 PetscValidHeaderSpecific(pc,PC_COOKIE,1); 168 169 if (!PCRegisterAllCalled) {ierr = PCRegisterAll(PETSC_NULL);CHKERRQ(ierr);} 170 ierr = PetscOptionsBegin(((PetscObject)pc)->comm,((PetscObject)pc)->prefix,"Preconditioner (PC) Options","PC");CHKERRQ(ierr); 171 if (!((PetscObject)pc)->type_name) { 172 ierr = PCGetDefaultType_Private(pc,&def);CHKERRQ(ierr); 173 } else { 174 def = ((PetscObject)pc)->type_name; 175 } 176 177 ierr = PetscOptionsList("-pc_type","Preconditioner","PCSetType",PCList,def,type,256,&flg);CHKERRQ(ierr); 178 if (flg) { 179 ierr = PCSetType(pc,type);CHKERRQ(ierr); 180 } else if (!((PetscObject)pc)->type_name){ 181 ierr = PCSetType(pc,def);CHKERRQ(ierr); 182 } 183 184 if (pc->ops->setfromoptions) { 185 ierr = (*pc->ops->setfromoptions)(pc);CHKERRQ(ierr); 186 } 187 ierr = PetscOptionsEnd();CHKERRQ(ierr); 188 pc->setfromoptionscalled++; 189 PetscFunctionReturn(0); 190 } 191