1 #ifdef PETSC_RCS_HEADER 2 static char vcid[] = "$Id: mpiaijpc.c,v 1.37 1998/07/28 03:28:42 bsmith Exp bsmith $"; 3 #endif 4 /* 5 Defines a block Jacobi preconditioner for the SeqAIJ/MPIAIJ format. 6 Handles special case of single block per processor. 7 This file knows about storage formats for SeqMPI/MPIAIJ matrices. 8 The general case is handled in aijpc.c 9 */ 10 #include "src/mat/impls/aij/mpi/mpiaij.h" 11 #include "src/pc/pcimpl.h" 12 #include "src/vec/vecimpl.h" 13 #include "src/pc/impls/bjacobi/bjacobi.h" 14 #include "sles.h" 15 16 typedef struct { 17 Vec x, y; 18 } PC_BJacobi_MPIAIJ; 19 20 #undef __FUNC__ 21 #define __FUNC__ "PCDestroy_BJacobi_MPIAIJ" 22 int PCDestroy_BJacobi_MPIAIJ(PC pc) 23 { 24 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 25 PC_BJacobi_MPIAIJ *bjac = (PC_BJacobi_MPIAIJ *) jac->data; 26 int ierr; 27 28 PetscFunctionBegin; 29 ierr = SLESDestroy(jac->sles[0]); CHKERRQ(ierr); 30 PetscFree(jac->sles); 31 ierr = VecDestroy(bjac->x); CHKERRQ(ierr); 32 ierr = VecDestroy(bjac->y); CHKERRQ(ierr); 33 if (jac->l_lens) PetscFree(jac->l_lens); 34 if (jac->g_lens) PetscFree(jac->g_lens); 35 PetscFree(bjac); PetscFree(jac); 36 PetscFunctionReturn(0); 37 } 38 39 40 #undef __FUNC__ 41 #define __FUNC__ "PCSetUpOnBlocks_BJacobi_MPIAIJ" 42 int PCSetUpOnBlocks_BJacobi_MPIAIJ(PC pc) 43 { 44 int ierr; 45 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 46 PC_BJacobi_MPIAIJ *bjac = (PC_BJacobi_MPIAIJ *) jac->data; 47 48 PetscFunctionBegin; 49 ierr = SLESSetUp(jac->sles[0],bjac->x,bjac->y); CHKERRQ(ierr); 50 PetscFunctionReturn(0); 51 } 52 53 #undef __FUNC__ 54 #define __FUNC__ "PCApply_BJacobi_MPIAIJ" 55 int PCApply_BJacobi_MPIAIJ(PC pc,Vec x, Vec y) 56 { 57 int ierr,its; 58 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 59 PC_BJacobi_MPIAIJ *bjac = (PC_BJacobi_MPIAIJ *) jac->data; 60 Scalar *x_array,*y_array; 61 62 PetscFunctionBegin; 63 /* 64 The VecPlaceArray() is to avoid having to copy the 65 y vector into the bjac->x vector. The reason for 66 the bjac->x vector is that we need a sequential vector 67 for the sequential solve. 68 */ 69 ierr = VecGetArray(x,&x_array); CHKERRQ(ierr); 70 ierr = VecGetArray(y,&y_array); CHKERRQ(ierr); 71 ierr = VecPlaceArray(bjac->x,x_array); CHKERRQ(ierr); 72 ierr = VecPlaceArray(bjac->y,y_array); CHKERRQ(ierr); 73 ierr = SLESSolve(jac->sles[0],bjac->x,bjac->y,&its); CHKERRQ(ierr); 74 ierr = VecRestoreArray(x,&x_array); CHKERRQ(ierr); 75 ierr = VecRestoreArray(y,&y_array); CHKERRQ(ierr); 76 PetscFunctionReturn(0); 77 } 78 79 #undef __FUNC__ 80 #define __FUNC__ "PCApplyTrans_BJacobi_MPIAIJ" 81 int PCApplyTrans_BJacobi_MPIAIJ(PC pc,Vec x, Vec y) 82 { 83 int ierr,its; 84 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 85 PC_BJacobi_MPIAIJ *bjac = (PC_BJacobi_MPIAIJ *) jac->data; 86 Scalar *x_array, *y_array; 87 88 PetscFunctionBegin; 89 /* 90 The VecPlaceArray() is to avoid having to copy the 91 y vector into the bjac->x vector. The reason for 92 the bjac->x vector is that we need a sequential vector 93 for the sequential solve. 94 */ 95 ierr = VecGetArray(x,&x_array); CHKERRQ(ierr); 96 ierr = VecGetArray(y,&y_array); CHKERRQ(ierr); 97 ierr = VecPlaceArray(bjac->x,x_array); CHKERRQ(ierr); 98 ierr = VecPlaceArray(bjac->y,y_array); CHKERRQ(ierr); 99 ierr = SLESSolveTrans(jac->sles[0],bjac->x,bjac->y,&its); CHKERRQ(ierr); 100 ierr = VecRestoreArray(x,&x_array); CHKERRQ(ierr); 101 ierr = VecRestoreArray(y,&y_array); CHKERRQ(ierr); 102 PetscFunctionReturn(0); 103 } 104 105 #undef __FUNC__ 106 #define __FUNC__ "PCSetUp_BJacobi_MPIAIJ" 107 int PCSetUp_BJacobi_MPIAIJ(PC pc) 108 { 109 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 110 Mat mat = pc->mat, pmat = pc->pmat; 111 Mat_MPIAIJ *pmatin = (Mat_MPIAIJ *) pmat->data; 112 Mat_MPIAIJ *matin = 0; 113 int ierr, m; 114 SLES sles; 115 Vec x,y; 116 PC_BJacobi_MPIAIJ *bjac; 117 KSP subksp; 118 PC subpc; 119 MatType type; 120 121 PetscFunctionBegin; 122 if (jac->use_true_local) { 123 ierr = MatGetType(pc->mat,&type,PETSC_NULL);CHKERRQ(ierr); 124 if (type != MATMPIAIJ) SETERRQ(PETSC_ERR_ARG_INCOMP,0,"Incompatible matrix type."); 125 matin = (Mat_MPIAIJ *) mat->data; 126 } 127 128 /* set default direct solver with no Krylov method */ 129 if (!pc->setupcalled) { 130 char *prefix; 131 ierr = SLESCreate(PETSC_COMM_SELF,&sles); CHKERRQ(ierr); 132 PLogObjectParent(pc,sles); 133 ierr = SLESGetKSP(sles,&subksp); CHKERRQ(ierr); 134 ierr = KSPSetType(subksp,KSPPREONLY); CHKERRQ(ierr); 135 ierr = SLESGetPC(sles,&subpc); CHKERRQ(ierr); 136 ierr = PCSetType(subpc,PCILU); CHKERRQ(ierr); 137 ierr = PCGetOptionsPrefix(pc,&prefix);CHKERRQ(ierr); 138 ierr = SLESSetOptionsPrefix(sles,prefix); CHKERRQ(ierr); 139 ierr = SLESAppendOptionsPrefix(sles,"sub_"); CHKERRQ(ierr); 140 ierr = SLESSetFromOptions(sles); CHKERRQ(ierr); 141 /* 142 This is not so good. The only reason we need to generate this vector 143 is so KSP may generate seq vectors for the local solves 144 */ 145 ierr = MatGetSize(pmatin->A,&m,&m); CHKERRQ(ierr); 146 ierr = VecCreateSeq(PETSC_COMM_SELF,m,&x); CHKERRQ(ierr); 147 ierr = VecCreateSeq(PETSC_COMM_SELF,m,&y); CHKERRQ(ierr); 148 PLogObjectParent(pc,x); 149 PLogObjectParent(pc,y); 150 151 pc->destroy = PCDestroy_BJacobi_MPIAIJ; 152 pc->apply = PCApply_BJacobi_MPIAIJ; 153 pc->applytrans = PCApplyTrans_BJacobi_MPIAIJ; 154 pc->setuponblocks = PCSetUpOnBlocks_BJacobi_MPIAIJ; 155 156 bjac = (PC_BJacobi_MPIAIJ *) PetscMalloc(sizeof(PC_BJacobi_MPIAIJ));CHKPTRQ(bjac); 157 PLogObjectMemory(pc,sizeof(PC_BJacobi_MPIAIJ)); 158 bjac->x = x; 159 bjac->y = y; 160 161 jac->sles = (SLES*) PetscMalloc( sizeof(SLES) ); CHKPTRQ(jac->sles); 162 jac->sles[0] = sles; 163 jac->data = (void *) bjac; 164 } else { 165 sles = jac->sles[0]; 166 bjac = (PC_BJacobi_MPIAIJ *)jac->data; 167 } 168 if (jac->use_true_local) { 169 ierr = SLESSetOperators(sles,matin->A,pmatin->A,pc->flag); CHKERRQ(ierr); 170 } else { 171 ierr = SLESSetOperators(sles,pmatin->A,pmatin->A,pc->flag); CHKERRQ(ierr); 172 } 173 PetscFunctionReturn(0); 174 } 175 176 #undef __FUNC__ 177 #define __FUNC__ "PCSetUp_BJacobi_SeqAIJ" 178 int PCSetUp_BJacobi_SeqAIJ(PC pc) 179 { 180 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 181 Mat mat = pc->mat, pmat = pc->pmat; 182 int ierr, m; 183 SLES sles; 184 Vec x,y; 185 PC_BJacobi_MPIAIJ *bjac; 186 KSP subksp; 187 PC subpc; 188 MatType type; 189 190 PetscFunctionBegin; 191 if (jac->use_true_local) { 192 MatGetType(mat,&type,PETSC_NULL); 193 if (type != MATSEQAIJ) SETERRQ(PETSC_ERR_ARG_INCOMP,0,"Incompatible matrix type."); 194 } 195 196 /* set default direct solver with no Krylov method */ 197 if (!pc->setupcalled) { 198 char *prefix; 199 ierr = SLESCreate(PETSC_COMM_SELF,&sles); CHKERRQ(ierr); 200 PLogObjectParent(pc,sles); 201 ierr = SLESGetKSP(sles,&subksp); CHKERRQ(ierr); 202 ierr = KSPSetType(subksp,KSPPREONLY); CHKERRQ(ierr); 203 ierr = SLESGetPC(sles,&subpc); CHKERRQ(ierr); 204 ierr = PCSetType(subpc,PCILU); CHKERRQ(ierr); 205 ierr = PCGetOptionsPrefix(pc,&prefix);CHKERRQ(ierr); 206 ierr = SLESSetOptionsPrefix(sles,prefix); CHKERRQ(ierr); 207 ierr = SLESAppendOptionsPrefix(sles,"sub_"); CHKERRQ(ierr); 208 ierr = SLESSetFromOptions(sles); CHKERRQ(ierr); 209 /* 210 This is not so good. The only reason we need to generate this vector 211 is so KSP may generate seq vectors for the local solves 212 */ 213 ierr = MatGetSize(pmat,&m,&m); CHKERRQ(ierr); 214 ierr = VecCreateSeq(PETSC_COMM_SELF,m,&x); CHKERRQ(ierr); 215 ierr = VecCreateSeq(PETSC_COMM_SELF,m,&y); CHKERRQ(ierr); 216 PLogObjectParent(pc,x); 217 PLogObjectParent(pc,y); 218 219 pc->destroy = PCDestroy_BJacobi_MPIAIJ; 220 pc->apply = PCApply_BJacobi_MPIAIJ; 221 pc->applytrans = PCApplyTrans_BJacobi_MPIAIJ; 222 pc->setuponblocks = PCSetUpOnBlocks_BJacobi_MPIAIJ; 223 224 bjac = (PC_BJacobi_MPIAIJ *) PetscMalloc(sizeof(PC_BJacobi_MPIAIJ));CHKPTRQ(bjac); 225 PLogObjectMemory(pc,sizeof(PC_BJacobi_MPIAIJ)); 226 bjac->x = x; 227 bjac->y = y; 228 229 jac->sles = (SLES*) PetscMalloc( sizeof(SLES) ); CHKPTRQ(jac->sles); 230 jac->sles[0] = sles; 231 jac->data = (void *) bjac; 232 } else { 233 sles = jac->sles[0]; 234 bjac = (PC_BJacobi_MPIAIJ *)jac->data; 235 } 236 if (jac->use_true_local) { 237 ierr = SLESSetOperators(sles,mat,pmat,pc->flag); CHKERRQ(ierr); 238 } else { 239 ierr = SLESSetOperators(sles,pmat,pmat,pc->flag); CHKERRQ(ierr); 240 } 241 PetscFunctionReturn(0); 242 } 243 244