2:  #include src/mat/impls/bdiag/seq/bdiag.h

  4: /* 
  5:    Mat_MPIBDiag - Parallel, block-diagonal format, where each diagonal
  6:    element consists of a square block of size bs x bs.  Dense storage
  7:    within each block is in column-major order.

  9:    For now, the parallel part is just a copy of the Mat_MPIAIJ
 10:    parallel data structure. 
 11:  */

 13: typedef struct {
 14:   PetscInt      brstart,brend;      /* block starting and ending local rows */
 15:   Mat           A;                  /* local matrix */
 16:   PetscInt      gnd;                /* number of global diagonals */
 17:   PetscInt      *gdiag;             /* global matrix diagonal numbers */
 18:   PetscMPIInt   size;               /* size of communicator */
 19:   PetscMPIInt   rank;               /* rank of proc in communicator */

 21:   /* The following variables are used for matrix assembly */
 22:   PetscTruth    donotstash;             /* 1 if off processor entries dropped */
 23:   MPI_Request   *send_waits;            /* array of send requests */
 24:   MPI_Request   *recv_waits;            /* array of receive requests */
 25:   PetscInt      nsends,nrecvs;         /* numbers of sends and receives */
 26:   PetscScalar   *svalues,*rvalues;     /* sending and receiving data */
 27:   PetscInt      rmax;                   /* maximum message length */
 28:   PetscInt      *garray;                /* work array */
 29:   PetscTruth    roworiented;            /* indicates MatSetValues() input default 1*/

 31:   /* The following variables are used for matrix-vector products */

 33:   Vec           lvec;                   /* local vector */
 34:   VecScatter    Mvctx;                  /* scatter context for vector */
 35: } Mat_MPIBDiag;

 37: EXTERN PetscErrorCode MatLoad_MPIBDiag(PetscViewer, MatType,Mat*);
 38: EXTERN PetscErrorCode MatSetUpMultiply_MPIBDiag(Mat);