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SUBROUTINE SL_INIT( ICTXT, NPROW, NPCOL )
*
* -- ScaLAPACK tools routine (version 1.7) --
* University of Tennessee, Knoxville, Oak Ridge National Laboratory,
* and University of California, Berkeley.
* May 1, 1997
*
* .. Scalar Arguments ..
INTEGER ICTXT, NPCOL, NPROW
* ..
*
* Purpose
* =======
*
* SL_INIT initializes an NPROW x NPCOL process grid using a row-major
* ordering of the processes. This routine retrieves a default system
* context which will include all available processes. In addition it
* spawns the processes if needed.
*
* Arguments
* =========
*
* ICTXT (global output) INTEGER
* ICTXT specifies the BLACS context handle identifying the
* created process grid. The context itself is global.
*
* NPROW (global input) INTEGER
* NPROW specifies the number of process rows in the grid
* to be created.
*
* NPCOL (global input) INTEGER
* NPCOL specifies the number of process columns in the grid
* to be created.
*
* =====================================================================
*
* .. Local Scalars ..
INTEGER IAM, NPROCS
* ..
* .. External Subroutines ..
EXTERNAL BLACS_GET, BLACS_GRIDINIT, BLACS_PINFO,
$ BLACS_SETUP
* ..
* .. Executable Statements ..
*
* Get starting information
*
CALL BLACS_PINFO( IAM, NPROCS )
*
* If machine needs additional set up, do it now
*
IF( NPROCS.LT.1 ) THEN
IF( IAM.EQ.0 )
$ NPROCS = NPROW * NPCOL
CALL BLACS_SETUP( IAM, NPROCS )
END IF
*
* Define process grid
*
CALL BLACS_GET( -1, 0, ICTXT )
CALL BLACS_GRIDINIT( ICTXT, 'Row-major', NPROW, NPCOL )
*
RETURN
*
* End of SL_INIT
*
END
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