/******************************************************************************
 * Copyright 1998-2019 Lawrence Livermore National Security, LLC and other
 * HYPRE Project Developers. See the top-level COPYRIGHT file for details.
 *
 * SPDX-License-Identifier: (Apache-2.0 OR MIT)
 ******************************************************************************/

/******************************************************************************
 *
 * Member functions for hypre_ParCSRBlockMatrix class.
 *
 *****************************************************************************/

#include "_hypre_parcsr_block_mv.h"

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixCreate
 *--------------------------------------------------------------------------*/

hypre_ParCSRBlockMatrix *
hypre_ParCSRBlockMatrixCreate( MPI_Comm comm,
                               HYPRE_Int block_size,
                               HYPRE_BigInt global_num_rows,
                               HYPRE_BigInt global_num_cols,
                               HYPRE_BigInt *row_starts,
                               HYPRE_BigInt *col_starts,
                               HYPRE_Int num_cols_offd,
                               HYPRE_Int num_nonzeros_diag,
                               HYPRE_Int num_nonzeros_offd )
{
   hypre_ParCSRBlockMatrix  *matrix;
   HYPRE_Int  num_procs, my_id;
   HYPRE_Int local_num_rows, local_num_cols;
   HYPRE_BigInt first_row_index, first_col_diag;

   matrix = hypre_CTAlloc(hypre_ParCSRBlockMatrix,  1, HYPRE_MEMORY_HOST);

   hypre_MPI_Comm_rank(comm,&my_id);
   hypre_MPI_Comm_size(comm,&num_procs);

   if (!row_starts)
   {
#ifdef HYPRE_NO_GLOBAL_PARTITION  
      hypre_GenerateLocalPartitioning(global_num_rows, num_procs, my_id, &row_starts);
#else
      hypre_GeneratePartitioning(global_num_rows,num_procs,&row_starts);
#endif
   }

   if (!col_starts)
   {
      if (global_num_rows == global_num_cols)
      {
         col_starts = row_starts;
      }
      else
      {
#ifdef HYPRE_NO_GLOBAL_PARTITION   
         hypre_GenerateLocalPartitioning(global_num_cols, num_procs, my_id, &col_starts);
#else
         hypre_GeneratePartitioning(global_num_cols,num_procs,&col_starts);
#endif
      }
   }
#ifdef HYPRE_NO_GLOBAL_PARTITION
   /* row_starts[0] is start of local rows.  row_starts[1] is start of next 
      processor's rows */
   first_row_index = row_starts[0];
   local_num_rows = (HYPRE_Int)(row_starts[1]-first_row_index) ;
   first_col_diag = col_starts[0];
   local_num_cols = (HYPRE_Int)(col_starts[1]-first_col_diag);
#else
   first_row_index = row_starts[my_id];
   local_num_rows = (HYPRE_Int)(row_starts[my_id+1]-first_row_index);
   first_col_diag = col_starts[my_id];
   local_num_cols = (HYPRE_Int)(col_starts[my_id+1]-first_col_diag);
#endif
   hypre_ParCSRBlockMatrixComm(matrix) = comm;
   hypre_ParCSRBlockMatrixDiag(matrix) = hypre_CSRBlockMatrixCreate(block_size,
                                                                    local_num_rows,local_num_cols,num_nonzeros_diag);
   hypre_ParCSRBlockMatrixOffd(matrix) = hypre_CSRBlockMatrixCreate(block_size,
                                                                    local_num_rows, num_cols_offd, num_nonzeros_offd);
   hypre_ParCSRBlockMatrixBlockSize(matrix) = block_size;
   hypre_ParCSRBlockMatrixGlobalNumRows(matrix) = global_num_rows;
   hypre_ParCSRBlockMatrixGlobalNumCols(matrix) = global_num_cols;
   hypre_ParCSRBlockMatrixFirstRowIndex(matrix) = first_row_index;
   hypre_ParCSRBlockMatrixFirstColDiag(matrix) = first_col_diag;

   hypre_ParCSRBlockMatrixLastRowIndex(matrix) = first_row_index + (HYPRE_BigInt)local_num_rows - 1;
   hypre_ParCSRBlockMatrixLastColDiag(matrix) = first_col_diag + (HYPRE_BigInt)local_num_cols - 1;

   hypre_ParCSRBlockMatrixColMapOffd(matrix) = NULL;

   hypre_ParCSRBlockMatrixAssumedPartition(matrix) = NULL;


/* When NO_GLOBAL_PARTITION is set we could make these null, instead
   of leaving the range.  If that change is made, then when this create
   is called from functions like the matrix-matrix multiply, be careful
   not to generate a new partition */
   hypre_ParCSRBlockMatrixRowStarts(matrix) = row_starts;
   hypre_ParCSRBlockMatrixColStarts(matrix) = col_starts;


   hypre_ParCSRBlockMatrixCommPkg(matrix) = NULL;
   hypre_ParCSRBlockMatrixCommPkgT(matrix) = NULL;

   /* set defaults */
   hypre_ParCSRBlockMatrixOwnsData(matrix) = 1;
   hypre_ParCSRBlockMatrixOwnsRowStarts(matrix) = 1;
   hypre_ParCSRBlockMatrixOwnsColStarts(matrix) = 1;
   if (row_starts == col_starts)
      hypre_ParCSRBlockMatrixOwnsColStarts(matrix) = 0;

   return matrix;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixDestroy
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixDestroy( hypre_ParCSRBlockMatrix *matrix )
{

   if (matrix)
   {
      if ( hypre_ParCSRBlockMatrixOwnsData(matrix) )
      {
         hypre_CSRBlockMatrixDestroy(hypre_ParCSRBlockMatrixDiag(matrix));
         hypre_CSRBlockMatrixDestroy(hypre_ParCSRBlockMatrixOffd(matrix));
         if (hypre_ParCSRBlockMatrixColMapOffd(matrix))
            hypre_TFree(hypre_ParCSRBlockMatrixColMapOffd(matrix), HYPRE_MEMORY_HOST);
         if (hypre_ParCSRBlockMatrixCommPkg(matrix))
            hypre_MatvecCommPkgDestroy(hypre_ParCSRBlockMatrixCommPkg(matrix));
         if (hypre_ParCSRBlockMatrixCommPkgT(matrix))
            hypre_MatvecCommPkgDestroy(hypre_ParCSRBlockMatrixCommPkgT(matrix));
      }
      if ( hypre_ParCSRBlockMatrixOwnsRowStarts(matrix) )
         hypre_TFree(hypre_ParCSRBlockMatrixRowStarts(matrix), HYPRE_MEMORY_HOST);
      if ( hypre_ParCSRBlockMatrixOwnsColStarts(matrix) )
         hypre_TFree(hypre_ParCSRBlockMatrixColStarts(matrix), HYPRE_MEMORY_HOST);

      if (hypre_ParCSRBlockMatrixAssumedPartition(matrix))
         hypre_ParCSRBlockMatrixDestroyAssumedPartition(matrix);


      hypre_TFree(matrix, HYPRE_MEMORY_HOST);
   }

   return hypre_error_flag;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixInitialize
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixInitialize( hypre_ParCSRBlockMatrix *matrix )
{
   HYPRE_Int  ierr=0;

   hypre_CSRBlockMatrixInitialize(hypre_ParCSRBlockMatrixDiag(matrix));
   hypre_CSRBlockMatrixInitialize(hypre_ParCSRBlockMatrixOffd(matrix));
   hypre_ParCSRBlockMatrixColMapOffd(matrix) = hypre_CTAlloc(HYPRE_BigInt, 
                                                             hypre_CSRBlockMatrixNumCols(hypre_ParCSRBlockMatrixOffd(matrix)), HYPRE_MEMORY_HOST);

   return ierr;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixSetNumNonzeros
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixSetNumNonzeros( hypre_ParCSRBlockMatrix *matrix)
{
   MPI_Comm comm = hypre_ParCSRBlockMatrixComm(matrix);
   hypre_CSRBlockMatrix *diag = hypre_ParCSRBlockMatrixDiag(matrix);
   HYPRE_Int *diag_i = hypre_CSRBlockMatrixI(diag);
   hypre_CSRBlockMatrix *offd = hypre_ParCSRBlockMatrixOffd(matrix);
   HYPRE_Int *offd_i = hypre_CSRBlockMatrixI(offd);
   HYPRE_Int local_num_rows = hypre_CSRBlockMatrixNumRows(diag);
   HYPRE_BigInt total_num_nonzeros;
   HYPRE_BigInt local_num_nonzeros;
   HYPRE_Int ierr = 0;

   local_num_nonzeros = (HYPRE_BigInt)(diag_i[local_num_rows] + offd_i[local_num_rows]);
   hypre_MPI_Allreduce(&local_num_nonzeros, &total_num_nonzeros, 1, HYPRE_MPI_BIG_INT,
                       hypre_MPI_SUM, comm);
   hypre_ParCSRBlockMatrixNumNonzeros(matrix) = total_num_nonzeros;

   return ierr;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixSetDNumNonzeros
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixSetDNumNonzeros( hypre_ParCSRBlockMatrix *matrix)
{
   MPI_Comm comm = hypre_ParCSRBlockMatrixComm(matrix);
   hypre_CSRBlockMatrix *diag = hypre_ParCSRBlockMatrixDiag(matrix);
   HYPRE_Int *diag_i = hypre_CSRBlockMatrixI(diag);
   hypre_CSRBlockMatrix *offd = hypre_ParCSRBlockMatrixOffd(matrix);
   HYPRE_Int *offd_i = hypre_CSRBlockMatrixI(offd);
   HYPRE_Int local_num_rows = hypre_CSRBlockMatrixNumRows(diag);
   HYPRE_Real total_num_nonzeros;
   HYPRE_Real local_num_nonzeros;
   HYPRE_Int ierr = 0;

   local_num_nonzeros = (HYPRE_Real) diag_i[local_num_rows] + (HYPRE_Real) offd_i[local_num_rows];
   hypre_MPI_Allreduce(&local_num_nonzeros, &total_num_nonzeros, 1,
                       HYPRE_MPI_REAL, hypre_MPI_SUM, comm);
   hypre_ParCSRBlockMatrixDNumNonzeros(matrix) = total_num_nonzeros;

   return ierr;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixSetDataOwner
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixSetDataOwner( hypre_ParCSRBlockMatrix *matrix,
                                     HYPRE_Int              owns_data )
{
   HYPRE_Int    ierr=0;

   hypre_ParCSRBlockMatrixOwnsData(matrix) = owns_data;

   return ierr;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixSetRowStartsOwner
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixSetRowStartsOwner( hypre_ParCSRBlockMatrix *matrix,
                                          HYPRE_Int owns_row_starts )
{
   HYPRE_Int    ierr=0;

   hypre_ParCSRBlockMatrixOwnsRowStarts(matrix) = owns_row_starts;

   return ierr;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixSetColStartsOwner
 *--------------------------------------------------------------------------*/

HYPRE_Int 
hypre_ParCSRBlockMatrixSetColStartsOwner( hypre_ParCSRBlockMatrix *matrix,
                                          HYPRE_Int owns_col_starts )
{
   HYPRE_Int    ierr=0;

   hypre_ParCSRBlockMatrixOwnsColStarts(matrix) = owns_col_starts;

   return ierr;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixCompress
 *--------------------------------------------------------------------------*/

hypre_ParCSRMatrix *
hypre_ParCSRBlockMatrixCompress( hypre_ParCSRBlockMatrix *matrix )
{
   MPI_Comm comm = hypre_ParCSRBlockMatrixComm(matrix);
   hypre_CSRBlockMatrix *diag = hypre_ParCSRBlockMatrixDiag(matrix);
   hypre_CSRBlockMatrix *offd = hypre_ParCSRBlockMatrixOffd(matrix);
   HYPRE_BigInt global_num_rows = hypre_ParCSRBlockMatrixGlobalNumRows(matrix);
   HYPRE_BigInt global_num_cols = hypre_ParCSRBlockMatrixGlobalNumCols(matrix);
   HYPRE_BigInt *row_starts = hypre_ParCSRBlockMatrixRowStarts(matrix);
   HYPRE_BigInt *col_starts = hypre_ParCSRBlockMatrixColStarts(matrix);
   HYPRE_Int num_cols_offd = hypre_CSRBlockMatrixNumCols(offd);
   HYPRE_Int num_nonzeros_diag = hypre_CSRBlockMatrixNumNonzeros(diag);
   HYPRE_Int num_nonzeros_offd = hypre_CSRBlockMatrixNumNonzeros(offd);

   hypre_ParCSRMatrix *matrix_C;

   HYPRE_Int i;

   matrix_C = hypre_ParCSRMatrixCreate(comm, global_num_rows, global_num_cols,
                                       row_starts,col_starts,num_cols_offd,num_nonzeros_diag,num_nonzeros_offd);
   hypre_ParCSRMatrixInitialize(matrix_C);

   hypre_CSRMatrixDestroy(hypre_ParCSRMatrixDiag(matrix_C));
   hypre_ParCSRMatrixDiag(matrix_C) = hypre_CSRBlockMatrixCompress(diag);
   hypre_CSRMatrixDestroy(hypre_ParCSRMatrixOffd(matrix_C));
   hypre_ParCSRMatrixOffd(matrix_C) = hypre_CSRBlockMatrixCompress(offd);

   for(i = 0; i < num_cols_offd; i++)
      hypre_ParCSRMatrixColMapOffd(matrix_C)[i] = 
         hypre_ParCSRBlockMatrixColMapOffd(matrix)[i];
   return matrix_C;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixConvertToParCSRMatrix
 *--------------------------------------------------------------------------*/

hypre_ParCSRMatrix *
hypre_ParCSRBlockMatrixConvertToParCSRMatrix(hypre_ParCSRBlockMatrix *matrix)
{
   MPI_Comm comm = hypre_ParCSRBlockMatrixComm(matrix);
   hypre_CSRBlockMatrix *diag = hypre_ParCSRBlockMatrixDiag(matrix);
   hypre_CSRBlockMatrix *offd = hypre_ParCSRBlockMatrixOffd(matrix);
   HYPRE_Int block_size = hypre_ParCSRBlockMatrixBlockSize(matrix);
   HYPRE_BigInt global_num_rows = hypre_ParCSRBlockMatrixGlobalNumRows(matrix);
   HYPRE_BigInt global_num_cols = hypre_ParCSRBlockMatrixGlobalNumCols(matrix);
   HYPRE_BigInt *row_starts = hypre_ParCSRBlockMatrixRowStarts(matrix);
   HYPRE_BigInt *col_starts = hypre_ParCSRBlockMatrixColStarts(matrix);
   HYPRE_Int num_cols_offd = hypre_CSRBlockMatrixNumCols(offd);
   HYPRE_Int num_nonzeros_diag = hypre_CSRBlockMatrixNumNonzeros(diag);
   HYPRE_Int num_nonzeros_offd = hypre_CSRBlockMatrixNumNonzeros(offd);
 
   hypre_ParCSRMatrix *matrix_C;
   HYPRE_BigInt *matrix_C_row_starts;
   HYPRE_BigInt *matrix_C_col_starts;

   HYPRE_Int *counter, *new_j_map;
   HYPRE_Int size_j, size_map, index, new_num_cols, removed = 0;
   HYPRE_Int *offd_j;
   HYPRE_BigInt *col_map_offd, *new_col_map_offd;
   

   HYPRE_Int num_procs, i, j;

   hypre_CSRMatrix *diag_nozeros, *offd_nozeros;

   hypre_MPI_Comm_size(comm,&num_procs);

#ifdef HYPRE_NO_GLOBAL_PARTITION
   matrix_C_row_starts = hypre_CTAlloc(HYPRE_BigInt,  2, HYPRE_MEMORY_HOST);
   matrix_C_col_starts = hypre_CTAlloc(HYPRE_BigInt,  2, HYPRE_MEMORY_HOST);
   for(i = 0; i < 2; i++)
   {
      matrix_C_row_starts[i] = row_starts[i]*(HYPRE_BigInt)block_size;
      matrix_C_col_starts[i] = col_starts[i]*(HYPRE_BigInt)block_size;
   }
#else
   matrix_C_row_starts = hypre_CTAlloc(HYPRE_BigInt,  num_procs + 1, HYPRE_MEMORY_HOST);
   matrix_C_col_starts = hypre_CTAlloc(HYPRE_BigInt,  num_procs + 1, HYPRE_MEMORY_HOST);
   for(i = 0; i < num_procs + 1; i++)
   {
      matrix_C_row_starts[i] = row_starts[i]*(HYPRE_BigInt)block_size;
      matrix_C_col_starts[i] = col_starts[i]*(HYPRE_BigInt)block_size;
   }
#endif

   matrix_C = hypre_ParCSRMatrixCreate(comm, global_num_rows*(HYPRE_BigInt)block_size, 
                                       global_num_cols*(HYPRE_BigInt)block_size, matrix_C_row_starts, 
                                       matrix_C_col_starts, num_cols_offd*block_size, 
                                       num_nonzeros_diag*block_size*block_size, 
                                       num_nonzeros_offd*block_size*block_size);
   hypre_ParCSRMatrixInitialize(matrix_C);

   /* DIAG */
   hypre_CSRMatrixDestroy(hypre_ParCSRMatrixDiag(matrix_C));
   hypre_ParCSRMatrixDiag(matrix_C) = 
      hypre_CSRBlockMatrixConvertToCSRMatrix(diag);

   /* AB - added to delete zeros */
   diag_nozeros = hypre_CSRMatrixDeleteZeros( 
      hypre_ParCSRMatrixDiag(matrix_C), 1e-14);
   if(diag_nozeros) 
   {
      hypre_CSRMatrixDestroy(hypre_ParCSRMatrixDiag(matrix_C));
      hypre_ParCSRMatrixDiag(matrix_C) = diag_nozeros;
   }

   /* OFF-DIAG */
   hypre_CSRMatrixDestroy(hypre_ParCSRMatrixOffd(matrix_C));
   hypre_ParCSRMatrixOffd(matrix_C) = 
      hypre_CSRBlockMatrixConvertToCSRMatrix(offd);

   /* AB - added to delete zeros - this just deletes from data and j arrays */
   offd_nozeros = hypre_CSRMatrixDeleteZeros( 
      hypre_ParCSRMatrixOffd(matrix_C), 1e-14);
   if(offd_nozeros) 
   {
      hypre_CSRMatrixDestroy(hypre_ParCSRMatrixOffd(matrix_C));
      hypre_ParCSRMatrixOffd(matrix_C) = offd_nozeros;
      removed = 1;
       
   }

   /* now convert the col_map_offd */
   for (i = 0; i < num_cols_offd; i++)
      for (j = 0; j < block_size; j++)
         hypre_ParCSRMatrixColMapOffd(matrix_C)[i*block_size + j] = 
            hypre_ParCSRBlockMatrixColMapOffd(matrix)[i]*(HYPRE_BigInt)block_size + (HYPRE_BigInt)j;
 
   /* if we deleted zeros, then it is possible that col_map_offd can be
      compressed as well - this requires some amount of work that could be skipped... */

   if (removed)
   {
      size_map =   num_cols_offd*block_size;
      counter = hypre_CTAlloc(HYPRE_Int,  size_map, HYPRE_MEMORY_HOST);
      new_j_map = hypre_CTAlloc(HYPRE_Int,  size_map, HYPRE_MEMORY_HOST);

      offd_j = hypre_CSRMatrixJ(hypre_ParCSRMatrixOffd(matrix_C));
      col_map_offd = hypre_ParCSRMatrixColMapOffd(matrix_C);
      
      size_j = hypre_CSRMatrixNumNonzeros(hypre_ParCSRMatrixOffd(matrix_C));
      /* mark which off_d entries are found in j */
      for (i=0; i < size_j; i++)
      {
         counter[offd_j[i]] = 1;
      }
      /*now find new numbering for columns (we will delete the 
        cols where counter = 0*/
      index = 0;
      for (i=0; i < size_map; i++)
      {
         if (counter[i]) new_j_map[i] = index++;
      }
      new_num_cols = index;
      /* if there are some col entries to remove: */ 
      if (!(index == size_map))
      {
         /* go thru j and adjust entries */         
         for (i=0; i < size_j; i++)
         {
            offd_j[i] = new_j_map[offd_j[i]];
         }
         /*now go thru col map and get rid of non-needed entries */ 
         new_col_map_offd = hypre_CTAlloc(HYPRE_BigInt,  new_num_cols, HYPRE_MEMORY_HOST);
         index = 0;
         for (i=0; i < size_map; i++)  
         {
            if (counter[i]) 
            {
               new_col_map_offd[index++] = col_map_offd[i];
            }
         }
         /* set the new col map */ 
         hypre_TFree(col_map_offd, HYPRE_MEMORY_HOST);
         hypre_ParCSRMatrixColMapOffd(matrix_C) = new_col_map_offd;
         /* modify the number of cols */
         hypre_CSRMatrixNumCols(hypre_ParCSRMatrixOffd(matrix_C)) = new_num_cols;
      }
      hypre_TFree(new_j_map, HYPRE_MEMORY_HOST);
      hypre_TFree(counter, HYPRE_MEMORY_HOST);
      
   }
   
   hypre_ParCSRMatrixSetNumNonzeros( matrix_C );
   hypre_ParCSRMatrixSetDNumNonzeros( matrix_C );
   
   /* we will not copy the comm package */  
   hypre_ParCSRMatrixCommPkg(matrix_C) = NULL;

   return matrix_C;
}

/*--------------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixConvertFromParCSRMatrix
 *--------------------------------------------------------------------------*/

hypre_ParCSRBlockMatrix *
hypre_ParCSRBlockMatrixConvertFromParCSRMatrix(hypre_ParCSRMatrix *matrix,
                                               HYPRE_Int matrix_C_block_size )
{
   MPI_Comm comm = hypre_ParCSRMatrixComm(matrix);
   hypre_CSRMatrix *diag = hypre_ParCSRMatrixDiag(matrix);
   hypre_CSRMatrix *offd = hypre_ParCSRMatrixOffd(matrix);
   HYPRE_BigInt global_num_rows = hypre_ParCSRMatrixGlobalNumRows(matrix);
   HYPRE_BigInt global_num_cols = hypre_ParCSRMatrixGlobalNumCols(matrix);
   HYPRE_BigInt *row_starts = hypre_ParCSRMatrixRowStarts(matrix);
   HYPRE_BigInt *col_starts = hypre_ParCSRMatrixColStarts(matrix);
   HYPRE_Int num_cols_offd = hypre_CSRMatrixNumCols(offd);
   HYPRE_BigInt *col_map_offd = hypre_ParCSRBlockMatrixColMapOffd(matrix);
   HYPRE_BigInt *map_to_node=NULL;
   HYPRE_Int *counter=NULL, *col_in_j_map=NULL;
   HYPRE_BigInt *matrix_C_col_map_offd = NULL;
   
   HYPRE_Int matrix_C_num_cols_offd;
   HYPRE_Int matrix_C_num_nonzeros_offd;
   HYPRE_Int num_rows, num_nodes;
   
   HYPRE_Int *offd_i        = hypre_CSRMatrixI(offd);
   HYPRE_Int *offd_j        = hypre_CSRMatrixJ(offd);
   HYPRE_Complex * offd_data = hypre_CSRMatrixData(offd);

   hypre_ParCSRBlockMatrix *matrix_C;
   HYPRE_BigInt *matrix_C_row_starts;
   HYPRE_BigInt *matrix_C_col_starts;
   hypre_CSRBlockMatrix *matrix_C_diag;
   hypre_CSRBlockMatrix *matrix_C_offd;

   HYPRE_Int *matrix_C_offd_i=NULL, *matrix_C_offd_j = NULL;
   HYPRE_Complex *matrix_C_offd_data = NULL;
   
   HYPRE_Int num_procs, i, j, k, k_map, count, index, start_index, pos, row;
   
   hypre_MPI_Comm_size(comm,&num_procs);

#ifdef HYPRE_NO_GLOBAL_PARTITION
   matrix_C_row_starts = hypre_CTAlloc(HYPRE_BigInt,  2, HYPRE_MEMORY_HOST);
   matrix_C_col_starts = hypre_CTAlloc(HYPRE_BigInt,  2, HYPRE_MEMORY_HOST);
   for(i = 0; i < 2; i++)
   {
      matrix_C_row_starts[i] = row_starts[i]/(HYPRE_BigInt)matrix_C_block_size;
      matrix_C_col_starts[i] = col_starts[i]/(HYPRE_BigInt)matrix_C_block_size;
   }
#else
   matrix_C_row_starts = hypre_CTAlloc(HYPRE_BigInt,  num_procs + 1, HYPRE_MEMORY_HOST);
   matrix_C_col_starts = hypre_CTAlloc(HYPRE_BigInt,  num_procs + 1, HYPRE_MEMORY_HOST);
   for(i = 0; i < num_procs + 1; i++)
   {
      matrix_C_row_starts[i] = row_starts[i]/(HYPRE_BigInt)matrix_C_block_size;
      matrix_C_col_starts[i] = col_starts[i]/(HYPRE_BigInt)matrix_C_block_size;
   }
#endif

   /************* create the diagonal part ************/
   matrix_C_diag = hypre_CSRBlockMatrixConvertFromCSRMatrix(diag, 
                                                            matrix_C_block_size);
 
   /*******  the offd part *******************/

   /* can't use the same function for the offd part - because this isn't square
      and the offd j entries aren't global numbering (have to consider the offd
      map) - need to look at col_map_offd first */

   /* figure out the new number of offd columns (num rows is same as diag) */
   num_cols_offd = hypre_CSRMatrixNumCols(offd);
   num_rows = hypre_CSRMatrixNumRows(diag);
   num_nodes =  num_rows/matrix_C_block_size;
   
   matrix_C_offd_i = hypre_CTAlloc(HYPRE_Int,  num_nodes + 1, HYPRE_MEMORY_HOST);

   matrix_C_num_cols_offd = 0;
   matrix_C_offd_i[0] = 0;
   matrix_C_num_nonzeros_offd = 0;

   if (num_cols_offd)
   {
      map_to_node = hypre_CTAlloc(HYPRE_BigInt,  num_cols_offd, HYPRE_MEMORY_HOST);
      matrix_C_num_cols_offd = 1;
      map_to_node[0] = col_map_offd[0]/(HYPRE_BigInt)matrix_C_block_size;
      for (i=1; i < num_cols_offd; i++)
      {
         map_to_node[i] = col_map_offd[i]/(HYPRE_BigInt)matrix_C_block_size;
         if (map_to_node[i] > map_to_node[i-1]) matrix_C_num_cols_offd++;
      }

      matrix_C_col_map_offd = hypre_CTAlloc(HYPRE_BigInt,  matrix_C_num_cols_offd, HYPRE_MEMORY_HOST);
      col_in_j_map = hypre_CTAlloc(HYPRE_Int,  num_cols_offd, HYPRE_MEMORY_HOST);

      matrix_C_col_map_offd[0] = map_to_node[0];
      col_in_j_map[0] = 0;
      count = 1;
      j = 1;
       
      /* fill in the col_map_off_d - these are global numbers.  Then we need to
         map these to j entries (these have local numbers) */
      for (i=1; i < num_cols_offd; i++)
      {
         if (map_to_node[i] > map_to_node[i-1])
         {
            matrix_C_col_map_offd[count++] = map_to_node[i];
         }
         col_in_j_map[j++] = count - 1;
      }
      
      /* now figure the nonzeros */   
      matrix_C_num_nonzeros_offd = 0;
      counter = hypre_CTAlloc(HYPRE_Int,  matrix_C_num_cols_offd, HYPRE_MEMORY_HOST);
      for (i=0; i < matrix_C_num_cols_offd; i++)
         counter[i] = -1;

      for (i=0; i < num_nodes; i++) /* for each block row */
      {
         matrix_C_offd_i[i] = matrix_C_num_nonzeros_offd;
         for (j=0; j < matrix_C_block_size; j++)
         {
            row = i*matrix_C_block_size+j;
            for (k=offd_i[row]; k < offd_i[row+1]; k++) /* go through single row */
            {
               k_map = col_in_j_map[offd_j[k]]; /*nodal col - see if this has
                                                  been in this block row (i)
                                                  already*/
               
               if (counter[k_map] < i) /* not yet counted for this nodal row */
               {
                  counter[k_map] = i;
                  matrix_C_num_nonzeros_offd++;
               }
            }
         }
      }
      /* fill in final i entry */
      matrix_C_offd_i[num_nodes] = matrix_C_num_nonzeros_offd;
   }

   /* create offd matrix */
   matrix_C_offd = hypre_CSRBlockMatrixCreate(matrix_C_block_size, num_nodes,
                                              matrix_C_num_cols_offd,   
                                              matrix_C_num_nonzeros_offd);

   /* assign i */
   hypre_CSRBlockMatrixI(matrix_C_offd) = matrix_C_offd_i;
   

   /* create (and allocate j and data) */
   if (matrix_C_num_nonzeros_offd)
   {
      matrix_C_offd_j = hypre_CTAlloc(HYPRE_Int,  matrix_C_num_nonzeros_offd, HYPRE_MEMORY_HOST);   
      matrix_C_offd_data =
         hypre_CTAlloc(HYPRE_Complex, 
                       matrix_C_num_nonzeros_offd*matrix_C_block_size*
                       matrix_C_block_size, HYPRE_MEMORY_HOST);  
      hypre_CSRBlockMatrixJ(matrix_C_offd) = matrix_C_offd_j;
      hypre_CSRMatrixData(matrix_C_offd) = matrix_C_offd_data;
   
      for (i=0; i < matrix_C_num_cols_offd; i++)
         counter[i] = -1;

      index = 0; /*keep track of entry in matrix_C_offd_j*/
      start_index = 0;
      for (i=0; i < num_nodes; i++) /* for each block row */
      {
         
         for (j=0; j < matrix_C_block_size; j++) /* for each row in block */
         {
            row = i*matrix_C_block_size+j;
            for (k=offd_i[row]; k < offd_i[row+1]; k++) /* go through single row's cols */
            {
               k_map = col_in_j_map[offd_j[k]]; /*nodal col  for off_d */
               if (counter[k_map] < start_index) /* not yet counted for this nodal row */
               {
                  counter[k_map] = index;
                  matrix_C_offd_j[index] = k_map;
                  /*copy the data: which position (corresponds to j array) + which row + which col */                
                  pos =  (index * matrix_C_block_size * matrix_C_block_size) + (j * matrix_C_block_size) + 
                     (HYPRE_Int)(col_map_offd[offd_j[k]]%(HYPRE_BigInt)matrix_C_block_size);
                  matrix_C_offd_data[pos] = offd_data[k];
                  index ++;
               }
               else  /* this col has already been listed for this row */
               {

                  /*copy the data: which position (corresponds to j array) + which row + which col */                
                  pos =  (counter[k_map]* matrix_C_block_size * matrix_C_block_size) + (j * matrix_C_block_size) + 
                     (HYPRE_Int)(col_map_offd[offd_j[k]]%(HYPRE_BigInt)(matrix_C_block_size));
                  matrix_C_offd_data[pos] = offd_data[k];
               }
            }
         }
         start_index = index; /* first index for current nodal row */
      }
   }

   /* *********create the new matrix  *************/
   matrix_C = hypre_ParCSRBlockMatrixCreate(comm, matrix_C_block_size, 
                                            global_num_rows/(HYPRE_BigInt)matrix_C_block_size, 
                                            global_num_cols/(HYPRE_BigInt)matrix_C_block_size, matrix_C_row_starts, 
                                            matrix_C_col_starts, matrix_C_num_cols_offd, 
                                            hypre_CSRBlockMatrixNumNonzeros(matrix_C_diag), 
                                            matrix_C_num_nonzeros_offd);

   /* use the diag and off diag matrices we have already created */
   hypre_CSRBlockMatrixDestroy(hypre_ParCSRMatrixDiag(matrix_C));
   hypre_ParCSRBlockMatrixDiag(matrix_C) = matrix_C_diag;
   hypre_CSRBlockMatrixDestroy(hypre_ParCSRMatrixOffd(matrix_C));
   hypre_ParCSRBlockMatrixOffd(matrix_C) = matrix_C_offd;

   hypre_ParCSRMatrixColMapOffd(matrix_C) = matrix_C_col_map_offd;

   /* *********don't bother to copy the comm_pkg *************/
   
   hypre_ParCSRBlockMatrixCommPkg(matrix_C) = NULL;
 
   /* CLEAN UP !!!! */
   hypre_TFree(map_to_node, HYPRE_MEMORY_HOST);
   hypre_TFree(col_in_j_map, HYPRE_MEMORY_HOST);
   hypre_TFree(counter, HYPRE_MEMORY_HOST);

   return matrix_C;
}

/* ----------------------------------------------------------------------
 * hypre_BlockMatvecCommPkgCreate
 * ---------------------------------------------------------------------*/

HYPRE_Int
hypre_BlockMatvecCommPkgCreate(hypre_ParCSRBlockMatrix *A)
{

#ifdef HYPRE_NO_GLOBAL_PARTITION
 
   HYPRE_Int        num_recvs, *recv_procs, *recv_vec_starts;

   HYPRE_Int        num_sends, *send_procs, *send_map_starts;
   HYPRE_Int        *send_map_elmts;

   HYPRE_Int        num_cols_off_d; 
   HYPRE_BigInt    *col_map_off_d; 

   HYPRE_BigInt     first_col_diag;
   HYPRE_BigInt     global_num_cols;


   MPI_Comm   comm;

   hypre_ParCSRCommPkg   *comm_pkg;
   hypre_IJAssumedPart   *apart;
   
   /*-----------------------------------------------------------
    * get parcsr_A information 
    *----------------------------------------------------------*/
   col_map_off_d =  hypre_ParCSRBlockMatrixColMapOffd(A);
   num_cols_off_d = hypre_CSRBlockMatrixNumCols(hypre_ParCSRBlockMatrixOffd(A));
   
   global_num_cols = hypre_ParCSRBlockMatrixGlobalNumCols(A); 
   
   comm = hypre_ParCSRBlockMatrixComm(A);

   first_col_diag = hypre_ParCSRBlockMatrixFirstColDiag(A);

   /* Create the assumed partition */
   if  (hypre_ParCSRBlockMatrixAssumedPartition(A) == NULL)
   {
      hypre_ParCSRBlockMatrixCreateAssumedPartition(A);
   }

   apart = hypre_ParCSRBlockMatrixAssumedPartition(A);

   /*-----------------------------------------------------------
    * get commpkg info information 
    *----------------------------------------------------------*/

   hypre_ParCSRCommPkgCreateApart_core( comm, col_map_off_d, first_col_diag, 
                                        num_cols_off_d, global_num_cols,
                                        &num_recvs, &recv_procs, &recv_vec_starts,
                                        &num_sends, &send_procs, &send_map_starts, 
                                        &send_map_elmts, apart);

   if (!num_recvs)
   {
      hypre_TFree(recv_procs, HYPRE_MEMORY_HOST);
      recv_procs = NULL;
   }
   if (!num_sends)
   {
      hypre_TFree(send_procs, HYPRE_MEMORY_HOST);
      hypre_TFree(send_map_elmts, HYPRE_MEMORY_HOST);
      send_procs = NULL;
      send_map_elmts = NULL;
   }

#else

   hypre_ParCSRCommPkg  *comm_pkg;
   
   MPI_Comm             comm = hypre_ParCSRBlockMatrixComm(A);

   HYPRE_Int                    num_sends;
   HYPRE_Int                    *send_procs;
   HYPRE_Int                    *send_map_starts;
   HYPRE_Int                    *send_map_elmts;
   HYPRE_Int                    num_recvs;
   HYPRE_Int                    *recv_procs;
   HYPRE_Int                    *recv_vec_starts;
   
   HYPRE_BigInt  *col_map_offd = hypre_ParCSRBlockMatrixColMapOffd(A);
   HYPRE_BigInt  first_col_diag = hypre_ParCSRBlockMatrixFirstColDiag(A);
   HYPRE_BigInt  *col_starts = hypre_ParCSRBlockMatrixColStarts(A);

   HYPRE_Int    num_cols_diag = hypre_CSRBlockMatrixNumCols(hypre_ParCSRBlockMatrixDiag(A));
   HYPRE_Int    num_cols_offd = hypre_CSRBlockMatrixNumCols(hypre_ParCSRBlockMatrixOffd(A));

   hypre_ParCSRCommPkgCreate_core(comm, col_map_offd, first_col_diag, 
                                  col_starts, num_cols_diag, num_cols_offd, 
                                  &num_recvs, &recv_procs, &recv_vec_starts,
                                  &num_sends, &send_procs, &send_map_starts, &send_map_elmts);

#endif

   /*-----------------------------------------------------------
    * setup commpkg
    *----------------------------------------------------------*/

   comm_pkg = hypre_CTAlloc(hypre_ParCSRCommPkg,  1, HYPRE_MEMORY_HOST);

   hypre_ParCSRCommPkgComm(comm_pkg) = comm;

   hypre_ParCSRCommPkgNumRecvs(comm_pkg) = num_recvs;
   hypre_ParCSRCommPkgRecvProcs(comm_pkg) = recv_procs;
   hypre_ParCSRCommPkgRecvVecStarts(comm_pkg) = recv_vec_starts;

   hypre_ParCSRCommPkgNumSends(comm_pkg) = num_sends;
   hypre_ParCSRCommPkgSendProcs(comm_pkg) = send_procs;
   hypre_ParCSRCommPkgSendMapStarts(comm_pkg) = send_map_starts;
   hypre_ParCSRCommPkgSendMapElmts(comm_pkg) = send_map_elmts;

   hypre_ParCSRBlockMatrixCommPkg(A) = comm_pkg;

   return hypre_error_flag;
}

/* ----------------------------------------------------------------------
 * hypre_ParCSRBlockMatrixExtractBExt: extracts rows from B which are located on 
 * other processors and needed for multiplication with A locally. The rows
 * are returned as CSRBlockMatrix.
 * ---------------------------------------------------------------------*/

hypre_CSRBlockMatrix * 
hypre_ParCSRBlockMatrixExtractBExt(hypre_ParCSRBlockMatrix *B, 
                                   hypre_ParCSRBlockMatrix *A, HYPRE_Int data)
{
   MPI_Comm comm = hypre_ParCSRBlockMatrixComm(B);
   HYPRE_BigInt first_col_diag = hypre_ParCSRBlockMatrixFirstColDiag(B);
   HYPRE_BigInt *col_map_offd = hypre_ParCSRBlockMatrixColMapOffd(B);
   HYPRE_Int block_size = hypre_ParCSRBlockMatrixBlockSize(B);

   hypre_ParCSRCommPkg *comm_pkg = hypre_ParCSRBlockMatrixCommPkg(A);
   HYPRE_Int num_recvs = hypre_ParCSRCommPkgNumRecvs(comm_pkg);
   HYPRE_Int *recv_vec_starts = hypre_ParCSRCommPkgRecvVecStarts(comm_pkg);
   HYPRE_Int num_sends = hypre_ParCSRCommPkgNumSends(comm_pkg);
   HYPRE_Int *send_map_starts = hypre_ParCSRCommPkgSendMapStarts(comm_pkg);
   HYPRE_Int *send_map_elmts = hypre_ParCSRCommPkgSendMapElmts(comm_pkg);
 
   hypre_ParCSRCommHandle *comm_handle;
   hypre_ParCSRCommPkg *tmp_comm_pkg;

   hypre_CSRBlockMatrix *diag = hypre_ParCSRBlockMatrixDiag(B);

   HYPRE_Int *diag_i = hypre_CSRBlockMatrixI(diag);
   HYPRE_Int *diag_j = hypre_CSRBlockMatrixJ(diag);
   HYPRE_Complex *diag_data = hypre_CSRBlockMatrixData(diag);

   hypre_CSRBlockMatrix *offd = hypre_ParCSRBlockMatrixOffd(B);

   HYPRE_Int *offd_i = hypre_CSRBlockMatrixI(offd);
   HYPRE_Int *offd_j = hypre_CSRBlockMatrixJ(offd);
   HYPRE_Complex *offd_data = hypre_CSRBlockMatrixData(offd);

   HYPRE_Int *B_int_i;
   HYPRE_BigInt *B_int_j;
   HYPRE_Complex *B_int_data;

   HYPRE_Int num_cols_B, num_nonzeros;
   HYPRE_Int num_rows_B_ext;
   HYPRE_Int num_procs, my_id;

   hypre_CSRBlockMatrix *B_ext;

   HYPRE_Int *B_ext_i;
   HYPRE_BigInt *B_ext_j;
   HYPRE_Complex *B_ext_data;
 
   HYPRE_Int *jdata_recv_vec_starts;
   HYPRE_Int *jdata_send_map_starts;
 
   HYPRE_Int i, j, k, l, counter, bnnz;
   HYPRE_Int start_index;
   HYPRE_Int j_cnt, jrow;

   hypre_MPI_Comm_size(comm,&num_procs);
   hypre_MPI_Comm_rank(comm,&my_id);

   bnnz = block_size * block_size;
   num_cols_B = hypre_ParCSRMatrixGlobalNumCols(B);
   num_rows_B_ext = recv_vec_starts[num_recvs];
   B_int_i = hypre_CTAlloc(HYPRE_Int,  send_map_starts[num_sends]+1, HYPRE_MEMORY_HOST);
   B_ext_i = hypre_CTAlloc(HYPRE_Int,  num_rows_B_ext+1, HYPRE_MEMORY_HOST);
/*--------------------------------------------------------------------------
 * generate B_int_i through adding number of row-elements of offd and diag
 * for corresponding rows. B_int_i[j+1] contains the number of elements of
 * a row j (which is determined through send_map_elmts) 
 *--------------------------------------------------------------------------*/
   B_int_i[0] = 0;
   j_cnt = 0;
   num_nonzeros = 0;
   for (i=0; i < num_sends; i++)
   {
      for (j = send_map_starts[i]; j < send_map_starts[i+1]; j++)
      {
         jrow = send_map_elmts[j];
         B_int_i[++j_cnt] = offd_i[jrow+1] - offd_i[jrow]
            + diag_i[jrow+1] - diag_i[jrow];
         num_nonzeros += B_int_i[j_cnt];
      }
   }

/*--------------------------------------------------------------------------
 * initialize communication 
 *--------------------------------------------------------------------------*/
   comm_handle = hypre_ParCSRCommHandleCreate(11,comm_pkg,
                                              &B_int_i[1],&B_ext_i[1]);

   B_int_j = hypre_CTAlloc(HYPRE_BigInt,  num_nonzeros, HYPRE_MEMORY_HOST);
   if (data) B_int_data = hypre_CTAlloc(HYPRE_Complex,  num_nonzeros*bnnz, HYPRE_MEMORY_HOST);

   jdata_send_map_starts = hypre_CTAlloc(HYPRE_Int,  num_sends+1, HYPRE_MEMORY_HOST);
   jdata_recv_vec_starts = hypre_CTAlloc(HYPRE_Int,  num_recvs+1, HYPRE_MEMORY_HOST);
   start_index = B_int_i[0];
   jdata_send_map_starts[0] = start_index;
   counter = 0;
   for (i=0; i < num_sends; i++)
   {
      num_nonzeros = counter;
      for (j = send_map_starts[i]; j < send_map_starts[i+1]; j++)
      {
         jrow = send_map_elmts[j];
         for (k=diag_i[jrow]; k < diag_i[jrow+1]; k++) 
         {
            B_int_j[counter] = (HYPRE_BigInt)diag_j[k]+first_col_diag;
            if (data) {
               for(l = 0; l < bnnz; l++) 
                  B_int_data[counter*bnnz+ l] = diag_data[k*bnnz+ l];
            }
            counter++;
         }
         for (k=offd_i[jrow]; k < offd_i[jrow+1]; k++) 
         {
            B_int_j[counter] = col_map_offd[offd_j[k]];
            if (data) {
               for(l = 0; l < bnnz; l++)
                  B_int_data[counter*bnnz+ l] = 
                     offd_data[k*bnnz+ l];
            }
            counter++;
         }
      }
      num_nonzeros = counter - num_nonzeros;
      start_index += num_nonzeros;
      jdata_send_map_starts[i+1] = start_index;
   }

   tmp_comm_pkg = hypre_CTAlloc(hypre_ParCSRCommPkg, 1, HYPRE_MEMORY_HOST);
   hypre_ParCSRCommPkgComm(tmp_comm_pkg) = comm;
   hypre_ParCSRCommPkgNumSends(tmp_comm_pkg) = num_sends;
   hypre_ParCSRCommPkgNumRecvs(tmp_comm_pkg) = num_recvs;
   hypre_ParCSRCommPkgSendProcs(tmp_comm_pkg) = hypre_ParCSRCommPkgSendProcs(comm_pkg);
   hypre_ParCSRCommPkgRecvProcs(tmp_comm_pkg) = hypre_ParCSRCommPkgRecvProcs(comm_pkg);
   hypre_ParCSRCommPkgSendMapStarts(tmp_comm_pkg) = jdata_send_map_starts; 

   hypre_ParCSRCommHandleDestroy(comm_handle);
   comm_handle = NULL;

/*--------------------------------------------------------------------------
 * after communication exchange B_ext_i[j+1] contains the number of elements
 * of a row j ! 
 * evaluate B_ext_i and compute num_nonzeros for B_ext 
 *--------------------------------------------------------------------------*/

   for (i=0; i < num_recvs; i++)
      for (j = recv_vec_starts[i]; j < recv_vec_starts[i+1]; j++)
         B_ext_i[j+1] += B_ext_i[j];

   num_nonzeros = B_ext_i[num_rows_B_ext];

   B_ext = hypre_CSRBlockMatrixCreate(block_size, num_rows_B_ext, num_cols_B, 
                                      num_nonzeros);
   B_ext_j = hypre_CTAlloc(HYPRE_BigInt,  num_nonzeros, HYPRE_MEMORY_HOST);
   if (data) B_ext_data = hypre_CTAlloc(HYPRE_Complex,  num_nonzeros*bnnz, HYPRE_MEMORY_HOST);

   for (i=0; i < num_recvs; i++)
   {
      start_index = B_ext_i[recv_vec_starts[i]];
      num_nonzeros = B_ext_i[recv_vec_starts[i+1]]-start_index;
      jdata_recv_vec_starts[i+1] = B_ext_i[recv_vec_starts[i+1]];
   }

   hypre_ParCSRCommPkgRecvVecStarts(tmp_comm_pkg) = jdata_recv_vec_starts;

   comm_handle = hypre_ParCSRCommHandleCreate(21,tmp_comm_pkg,B_int_j,B_ext_j);
   hypre_ParCSRCommHandleDestroy(comm_handle);
   comm_handle = NULL;

   if (data)
   {
      comm_handle = hypre_ParCSRBlockCommHandleCreate(1, bnnz,tmp_comm_pkg,
                                                      B_int_data, B_ext_data);
      hypre_ParCSRBlockCommHandleDestroy(comm_handle);
      comm_handle = NULL;
   }

   hypre_CSRBlockMatrixI(B_ext) = B_ext_i;
   hypre_CSRBlockMatrixBigJ(B_ext) = B_ext_j;
   if (data) hypre_CSRBlockMatrixData(B_ext) = B_ext_data;

   hypre_TFree(B_int_i, HYPRE_MEMORY_HOST);
   hypre_TFree(B_int_j, HYPRE_MEMORY_HOST);
   if (data) hypre_TFree(B_int_data, HYPRE_MEMORY_HOST);
   hypre_TFree(jdata_send_map_starts, HYPRE_MEMORY_HOST);
   hypre_TFree(jdata_recv_vec_starts, HYPRE_MEMORY_HOST);
   hypre_TFree(tmp_comm_pkg, HYPRE_MEMORY_HOST);

   return B_ext;
}
/*--------------------------------------------------------------------------
 * hypre_ParVectorCreateFromBlock
 *--------------------------------------------------------------------------*/

hypre_ParVector *
hypre_ParVectorCreateFromBlock(  MPI_Comm comm,
                                 HYPRE_BigInt p_global_size, 
                                 HYPRE_BigInt *p_partitioning, HYPRE_Int block_size)
{
   hypre_ParVector  *vector;
   HYPRE_Int num_procs, my_id, i;
   HYPRE_BigInt global_size;
   HYPRE_BigInt *new_partitioning; /* need to create a new partitioning - son't want to write over
                                   what is passed in */
   


   global_size = p_global_size*(HYPRE_BigInt)block_size;

   vector = hypre_CTAlloc(hypre_ParVector,  1, HYPRE_MEMORY_HOST);
   hypre_MPI_Comm_rank(comm,&my_id);
   hypre_MPI_Comm_size(comm,&num_procs);

   if (!p_partitioning)
   {
#ifdef HYPRE_NO_GLOBAL_PARTITION
      hypre_GenerateLocalPartitioning(global_size, num_procs, my_id, &new_partitioning);
#else
      hypre_GeneratePartitioning(global_size, num_procs, &new_partitioning);
#endif
   }
   else /* adjust for block_size */
   {
#ifdef HYPRE_NO_GLOBAL_PARTITION
      new_partitioning = hypre_CTAlloc(HYPRE_BigInt,  2, HYPRE_MEMORY_HOST);
      for(i = 0; i < 2; i++)
      {
         new_partitioning[i] = p_partitioning[i]*(HYPRE_BigInt)block_size;
      }
#else
      new_partitioning = hypre_CTAlloc(HYPRE_BigInt,  num_procs + 1, HYPRE_MEMORY_HOST);
      for(i = 0; i < num_procs + 1; i++)
      {
         new_partitioning[i] = p_partitioning[i]*(HYPRE_BigInt)block_size;
      }
#endif
   }
   

   hypre_ParVectorComm(vector) = comm;
   hypre_ParVectorGlobalSize(vector) = global_size;
#ifdef HYPRE_NO_GLOBAL_PARTITION
   hypre_ParVectorFirstIndex(vector) = new_partitioning[0];
   hypre_ParVectorLastIndex(vector) = new_partitioning[1]-1;
   hypre_ParVectorPartitioning(vector) = new_partitioning;
   hypre_ParVectorLocalVector(vector) = 
      hypre_SeqVectorCreate(new_partitioning[1]-new_partitioning[0]);
#else
   hypre_ParVectorFirstIndex(vector) = new_partitioning[my_id];
   hypre_ParVectorLastIndex(vector) = new_partitioning[my_id+1] -1;
   hypre_ParVectorPartitioning(vector) = new_partitioning;
   hypre_ParVectorLocalVector(vector) = 
      hypre_SeqVectorCreate(new_partitioning[my_id+1]-new_partitioning[my_id]);
#endif

   /* set defaults */
   hypre_ParVectorOwnsData(vector) = 1;
   hypre_ParVectorOwnsPartitioning(vector) = 1;

   return vector;
}
