1:  #include <petscviewer.h>
  2:  #include <petsc/private/matimpl.h>

  4: PetscErrorCode MatView_Binary_BlockSizes(Mat mat,PetscViewer viewer)
  5: {
  6:   FILE           *info;
  7:   PetscMPIInt    rank;
  8:   PetscInt       rbs,cbs;

 12:   MatGetBlockSizes(mat,&rbs,&cbs);
 13:   PetscViewerBinaryGetInfoPointer(viewer,&info);
 14:   MPI_Comm_rank(PetscObjectComm((PetscObject)viewer),&rank);
 15:   if (!rank && info) {
 16:     if (rbs != cbs) {PetscFPrintf(PETSC_COMM_SELF,info,"-matload_block_size %D,%D\n",rbs,cbs);}
 17:     else            {PetscFPrintf(PETSC_COMM_SELF,info,"-matload_block_size %D\n",rbs);}
 18:   }
 19:   return(0);
 20: }

 22: PetscErrorCode MatLoad_Binary_BlockSizes(Mat mat,PetscViewer viewer)
 23: {
 24:   PetscInt       rbs,cbs,bs[2],n = 2;
 25:   PetscBool      set;

 29:   /* get current block sizes */
 30:   MatGetBlockSizes(mat,&rbs,&cbs);
 31:   bs[0] = rbs; bs[1] = cbs;
 32:   /* get block sizes from the options database */
 33:   PetscOptionsBegin(PetscObjectComm((PetscObject)viewer),NULL,"Options for loading matrix block size","Mat");
 34:   PetscOptionsIntArray("-matload_block_size","Set the block size used to store the matrix","MatLoad",bs,&n,&set);
 35:   PetscOptionsEnd();
 36:   if (!set) return(0);
 37:   if (n == 1) bs[1] = bs[0]; /* to support -matload_block_size <bs> */
 38:   /* set matrix block sizes */
 39:   if (bs[0] > 0) rbs = bs[0];
 40:   if (bs[1] > 0) cbs = bs[1];
 41:   MatSetBlockSizes(mat,rbs,cbs);
 42:   return(0);
 43: }