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

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

 23: /*
 24:        This data is specific for certain implementations
 25: */

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

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

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