1 #ifndef lint 2 static char vcid[] = "$Id: mpiaijpc.c,v 1.26 1997/01/06 20:24:32 balay Exp balay $"; 3 #endif 4 /* 5 Defines a block Jacobi preconditioner for the MPIAIJ format. 6 Handles special case of single block per processor. 7 This file knows about storage formats for 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(PetscObject obj) 23 { 24 PC pc = (PC) obj; 25 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 26 PC_BJacobi_MPIAIJ *bjac = (PC_BJacobi_MPIAIJ *) jac->data; 27 int ierr; 28 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 return 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 ierr = SLESSetUp(jac->sles[0],bjac->x,bjac->y); CHKERRQ(ierr); 49 return 0; 50 } 51 52 #undef __FUNC__ 53 #define __FUNC__ "PCApply_BJacobi_MPIAIJ" 54 int PCApply_BJacobi_MPIAIJ(PC pc,Vec x, Vec y) 55 { 56 int ierr,its; 57 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 58 PC_BJacobi_MPIAIJ *bjac = (PC_BJacobi_MPIAIJ *) jac->data; 59 Scalar *x_array,*x_true_array, *y_array,*y_true_array; 60 61 /* 62 The VecPlaceArray() is to avoid having to copy the 63 y vector into the bjac->x vector. The reason for 64 the bjac->x vector is that we need a sequential vector 65 for the sequential solve. 66 */ 67 VecGetArray_Fast(x,x_array); 68 VecGetArray_Fast(y,y_array); 69 VecGetArray_Fast(bjac->x,x_true_array); 70 VecGetArray_Fast(bjac->y,y_true_array); 71 VecPlaceArray_Fast(bjac->x,x_array); 72 VecPlaceArray_Fast(bjac->y,y_array); 73 ierr = SLESSolve(jac->sles[0],bjac->x,bjac->y,&its); 74 VecPlaceArray_Fast(bjac->x,x_true_array); 75 VecPlaceArray_Fast(bjac->y,y_true_array); 76 return 0; 77 } 78 79 #undef __FUNC__ 80 #define __FUNC__ "PCSetUp_BJacobi_MPIAIJ" 81 int PCSetUp_BJacobi_MPIAIJ(PC pc) 82 { 83 PC_BJacobi *jac = (PC_BJacobi *) pc->data; 84 Mat mat = pc->mat, pmat = pc->pmat; 85 Mat_MPIAIJ *pmatin = (Mat_MPIAIJ *) pmat->data; 86 Mat_MPIAIJ *matin = 0; 87 int ierr, m; 88 SLES sles; 89 Vec x,y; 90 PC_BJacobi_MPIAIJ *bjac; 91 KSP subksp; 92 PC subpc; 93 MatType type; 94 95 if (jac->use_true_local) { 96 MatGetType(pc->mat,&type,PETSC_NULL); 97 if (type != MATMPIAIJ) SETERRQ(1,0,"Incompatible matrix type."); 98 matin = (Mat_MPIAIJ *) mat->data; 99 } 100 101 /* set default direct solver with no Krylov method */ 102 if (!pc->setupcalled) { 103 char *prefix; 104 ierr = SLESCreate(MPI_COMM_SELF,&sles); CHKERRQ(ierr); 105 PLogObjectParent(pc,sles); 106 ierr = SLESGetKSP(sles,&subksp); CHKERRQ(ierr); 107 ierr = KSPSetType(subksp,KSPPREONLY); CHKERRQ(ierr); 108 ierr = SLESGetPC(sles,&subpc); CHKERRQ(ierr); 109 ierr = PCSetType(subpc,PCILU); CHKERRQ(ierr); 110 ierr = PCGetOptionsPrefix(pc,&prefix);CHKERRQ(ierr); 111 ierr = SLESSetOptionsPrefix(sles,prefix); CHKERRQ(ierr); 112 ierr = SLESAppendOptionsPrefix(sles,"sub_"); CHKERRQ(ierr); 113 ierr = SLESSetFromOptions(sles); CHKERRQ(ierr); 114 /* 115 This is not so good. The only reason we need to generate this vector 116 is so KSP may generate seq vectors for the local solves 117 */ 118 ierr = MatGetSize(pmatin->A,&m,&m); CHKERRQ(ierr); 119 ierr = VecCreateSeq(MPI_COMM_SELF,m,&x); CHKERRQ(ierr); 120 ierr = VecCreateSeq(MPI_COMM_SELF,m,&y); CHKERRQ(ierr); 121 PLogObjectParent(pc,x); 122 PLogObjectParent(pc,y); 123 124 pc->destroy = PCDestroy_BJacobi_MPIAIJ; 125 pc->apply = PCApply_BJacobi_MPIAIJ; 126 pc->setuponblocks = PCSetUpOnBlocks_BJacobi_MPIAIJ; 127 128 bjac = (PC_BJacobi_MPIAIJ *) PetscMalloc(sizeof(PC_BJacobi_MPIAIJ));CHKPTRQ(bjac); 129 PLogObjectMemory(pc,sizeof(PC_BJacobi_MPIAIJ)); 130 bjac->x = x; 131 bjac->y = y; 132 133 jac->sles = (SLES*) PetscMalloc( sizeof(SLES) ); CHKPTRQ(jac->sles); 134 jac->sles[0] = sles; 135 jac->data = (void *) bjac; 136 } 137 else { 138 sles = jac->sles[0]; 139 bjac = (PC_BJacobi_MPIAIJ *)jac->data; 140 } 141 /* if (jac->l_true[0] == USE_TRUE_MATRIX) { 142 ierr = SLESSetOperators(sles,matin->A,matin->A,pc->flag); 143 } 144 else */ if (jac->use_true_local) 145 ierr = SLESSetOperators(sles,matin->A,pmatin->A,pc->flag); 146 else 147 ierr = SLESSetOperators(sles,pmatin->A,pmatin->A,pc->flag); 148 CHKERRQ(ierr); 149 return 0; 150 } 151 152 153