1: #pragma once
  2: /*
  3:     Private data for block Jacobi and block Gauss-Seidel preconditioner.
  4: */
  5: #include <petsc/private/pcimpl.h>

  7: /*
  8:        This data is general for all implementations
  9: */
 10: typedef struct {
 11:   PetscInt     n;              /* number of global blocks */
 12:   PetscInt     n_local;        /* number of blocks in this subcommunicator or in this process */
 13:   PetscInt     first_local;    /* number of first block on processor */
 14:   PetscBool    use_true_local; /* use block from true matrix, not preconditioner matrix for local MatMult() */
 15:   KSP         *ksp;            /* KSP contexts for blocks or for subcommunicator */
 16:   void        *data;           /* implementation-specific data */
 17:   PetscInt    *l_lens;         /* lens of each block */
 18:   PetscInt    *g_lens;
 19:   PetscSubcomm psubcomm; /* for multiple processors per block */
 20: } PC_BJacobi;

 22: /*
 23:        This data is specific for certain implementations
 24: */

 26: /*  This is for multiple blocks per processor */
 27: typedef struct {
 28:   Vec      *x, *y;      /* work vectors for solves on each block */
 29:   PetscInt *starts;     /* starting point of each block */
 30:   Mat      *mat, *pmat; /* submatrices for each block */
 31:   IS       *is;         /* for gathering the submatrices */
 32: } PC_BJacobi_Multiblock;

 34: /*  This is for a single block per processor */
 35: typedef struct {
 36:   Vec x, y;
 37: } PC_BJacobi_Singleblock;

 39: /*  This is for multiple processors per block */
 40: typedef struct {
 41:   PC           pc;         /* preconditioner used on each subcommunicator */
 42:   Vec          xsub, ysub; /* vectors of a subcommunicator to hold parallel vectors of PetscObjectComm((PetscObject)pc) */
 43:   Mat          submats;    /* matrix and optional preconditioner matrix belong to a subcommunicator */
 44:   PetscSubcomm psubcomm;
 45: } PC_BJacobi_Multiproc;