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HPL_grid_init(3)	     HPL Library Functions	      HPL_grid_init(3)

NAME
       HPL_grid_init - Create a	process	grid.

SYNOPSIS
       #include	"hpl.h"

       int  HPL_grid_init(  MPI_Comm  COMM, const HPL_T_ORDER ORDER, const int
       NPROW, const int	NPCOL, HPL_T_grid * GRID );

DESCRIPTION
       HPL_grid_init creates a NPROW x NPCOL  process  grid using  column-  or
       row-major  ordering  from an initial collection of processes identified
       by an  MPI  communicator.  Successful  completion is indicated  by  the
       returned	 error	code MPI_SUCCESS.  Other error codes depend on the MPI
       implementation. The coordinates of processes that are not part  of  the
       grid are	set to values outside of [0..NPROW) x [0..NPCOL).

ARGUMENTS
       COMM    (global/local input)    MPI_Comm
	       On  entry,   COMM  is  the  MPI	communicator  identifying  the
	       initial	collection  of	processes out of which	the   grid  is
	       formed.

       ORDER   (global input)	       const HPL_T_ORDER
	       On  entry,  ORDER specifies how the processes should be ordered
	       in the grid as follows:
		  ORDER	= HPL_ROW_MAJOR	   row-major	ordering;
		  ORDER	= HPL_COLUMN_MAJOR column-major	ordering;

       NPROW   (global input)	       const int
	       On entry,  NPROW	 specifies the number of process rows  in  the
	       grid to be created. NPROW must be at least one.

       NPCOL   (global input)	       const int
	       On  entry,   NPCOL  specifies  the number of process columns in
	       the grid	to be created. NPCOL must be at	least one.

       GRID    (local input/output)    HPL_T_grid *
	       On entry,  GRID	points	to the data structure  containing  the
	       process grid information	to be initialized.

SEE ALSO
       HPL_pnum	(3), HPL_grid_info (3),	HPL_grid_exit (3).

HPL 2.1			       October 26, 2012		      HPL_grid_init(3)

NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | SEE ALSO

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