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<TITLE>HPL_grid_init HPL 2.0 Library Functions September 10, 2008</TITLE> |
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<BODY BGCOLOR="WHITE" TEXT = "#000000" LINK = "#0000ff" VLINK = "#000099" |
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ALINK = "#ffff00"> |
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<H1>Name</H1> |
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<B>HPL_grid_init</B> Create a process grid. |
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<H1>Synopsis</H1> |
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<CODE>#include "hpl.h"</CODE><BR><BR> |
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<CODE>int</CODE> |
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<CODE>HPL_grid_init(</CODE> |
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<CODE>MPI_Comm</CODE> |
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<CODE>COMM</CODE>, |
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<CODE>const HPL_T_ORDER</CODE> |
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<CODE>ORDER</CODE>, |
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<CODE>const int</CODE> |
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<CODE>NPROW</CODE>, |
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<CODE>const int</CODE> |
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<CODE>NPCOL</CODE>, |
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<CODE>HPL_T_grid *</CODE> |
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<CODE>GRID</CODE> |
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<CODE>);</CODE> |
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<H1>Description</H1> |
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<B>HPL_grid_init</B> |
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creates a NPROW x NPCOL process grid using column- or |
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row-major ordering from an initial collection of processes identified |
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by an MPI communicator. Successful completion is indicated by the |
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returned error code MPI_SUCCESS. Other error codes depend on the MPI |
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implementation. The coordinates of processes that are not part of the |
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grid are set to values outside of [0..NPROW) x [0..NPCOL). |
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<H1>Arguments</H1> |
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<PRE>
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COMM (global/local input) MPI_Comm |
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On entry, COMM is the MPI communicator identifying the |
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initial collection of processes out of which the grid is |
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formed. |
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<PRE>
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ORDER (global input) const HPL_T_ORDER |
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On entry, ORDER specifies how the processes should be ordered |
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in the grid as follows: |
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ORDER = HPL_ROW_MAJOR row-major ordering; |
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ORDER = HPL_COLUMN_MAJOR column-major ordering; |
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</PRE>
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<PRE>
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NPROW (global input) const int |
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On entry, NPROW specifies the number of process rows in the |
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grid to be created. NPROW must be at least one. |
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</PRE>
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<PRE>
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NPCOL (global input) const int |
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On entry, NPCOL specifies the number of process columns in |
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the grid to be created. NPCOL must be at least one. |
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</PRE>
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<PRE>
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GRID (local input/output) HPL_T_grid * |
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On entry, GRID points to the data structure containing the |
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process grid information to be initialized. |
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</PRE>
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<H1>See Also</H1> |
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<A HREF="HPL_pnum.html">HPL_pnum</A>, |
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<A HREF="HPL_grid_info.html">HPL_grid_info</A>, |
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<A HREF="HPL_grid_exit.html">HPL_grid_exit</A>. |
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