Actual source code: mpibdiag.h

 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      *rowners;           /* row range owned by each processor */
 15:   PetscInt      rstart,rend;        /* starting and ending local rows */
 16:   PetscInt      brstart,brend;      /* block starting and ending local rows */
 17:   Mat           A;                  /* local matrix */
 18:   PetscInt      gnd;                /* number of global diagonals */
 19:   PetscInt      *gdiag;             /* global matrix diagonal numbers */
 20:   PetscMPIInt   size;               /* size of communicator */
 21:   PetscMPIInt   rank;               /* rank of proc in communicator */

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

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

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

 39: EXTERN PetscErrorCode MatLoad_MPIBDiag(PetscViewer, MatType,Mat*);
 40: EXTERN PetscErrorCode MatSetUpMultiply_MPIBDiag(Mat);