1 2 #if !defined(__BJACOBI_H) 3 #define __BJACOBI_H 4 /* 5 Private data for block Jacobi and block Gauss-Seidel preconditioner. 6 */ 7 #include <petscksp.h> 8 #include <petsc/private/pcimpl.h> 9 10 /* 11 This data is general for all implementations 12 */ 13 typedef struct { 14 PetscInt n; /* number of global blocks */ 15 PetscInt n_local; /* number of blocks in this subcommunicator or in this process */ 16 PetscInt first_local; /* number of first block on processor */ 17 PetscBool use_true_local; /* use block from true matrix, not preconditioner matrix for local MatMult() */ 18 KSP *ksp; /* KSP contexts for blocks or for subcommunicator */ 19 void *data; /* implementation-specific data */ 20 PetscBool same_local_solves; /* flag indicating whether all local solvers are same (used for PCView()) */ 21 PetscInt *l_lens; /* lens of each block */ 22 PetscInt *g_lens; 23 PetscSubcomm psubcomm; /* for multiple processors per block */ 24 } PC_BJacobi; 25 26 /* 27 This data is specific for certain implementations 28 */ 29 30 /* This is for multiple blocks per processor */ 31 typedef struct { 32 Vec *x,*y; /* work vectors for solves on each block */ 33 PetscInt *starts; /* starting point of each block */ 34 Mat *mat,*pmat; /* submatrices for each block */ 35 IS *is; /* for gathering the submatrices */ 36 } PC_BJacobi_Multiblock; 37 38 /* This is for a single block per processor */ 39 typedef struct { 40 Vec x,y; 41 } PC_BJacobi_Singleblock; 42 43 /* This is for multiple processors per block */ 44 typedef struct { 45 PC pc; /* preconditioner used on each subcommunicator */ 46 Vec xsub,ysub; /* vectors of a subcommunicator to hold parallel vectors of PetscObjectComm((PetscObject)pc) */ 47 Mat submats; /* matrix and optional preconditioner matrix belong to a subcommunicator */ 48 PetscSubcomm psubcomm; 49 } PC_BJacobi_Multiproc; 50 #endif 51 52 53