pcsetpblas()

subroutine pcsetpblas

(

integer

ictxt

)

Definition at line 1477 of file pcblastst.f.

*
*  -- PBLAS test routine (version 2.0) --
*     University of Tennessee, Knoxville, Oak Ridge National Laboratory,
*     and University of California, Berkeley.
*     April 1, 1998
*
*     .. Scalar Arguments ..
      INTEGER            ICTXT
*     ..
*
*  Purpose
*  =======
*
*  PCSETPBLAS initializes *all* the dummy arguments to correct values.
*
*  Notes
*  =====
*
*  A description  vector  is associated with each 2D block-cyclicly dis-
*  tributed matrix.  This  vector  stores  the  information  required to
*  establish the  mapping  between a  matrix entry and its corresponding
*  process and memory location.
*
*  In  the  following  comments,   the character _  should  be  read  as
*  "of  the  distributed  matrix".  Let  A  be a generic term for any 2D
*  block cyclicly distributed matrix.  Its description vector is DESCA:
*
*  NOTATION         STORED IN       EXPLANATION
*  ---------------- --------------- ------------------------------------
*  DTYPE_A (global) DESCA( DTYPE_ ) The descriptor type.
*  CTXT_A  (global) DESCA( CTXT_  ) The BLACS context handle, indicating
*                                   the NPROW x NPCOL BLACS process grid
*                                   A  is distributed over.  The context
*                                   itself  is  global,  but  the handle
*                                   (the integer value) may vary.
*  M_A     (global) DESCA( M_     ) The  number of rows in the distribu-
*                                   ted matrix A, M_A >= 0.
*  N_A     (global) DESCA( N_     ) The number of columns in the distri-
*                                   buted matrix A, N_A >= 0.
*  IMB_A   (global) DESCA( IMB_   ) The number of rows of the upper left
*                                   block of the matrix A, IMB_A > 0.
*  INB_A   (global) DESCA( INB_   ) The  number  of columns of the upper
*                                   left   block   of   the   matrix  A,
*                                   INB_A > 0.
*  MB_A    (global) DESCA( MB_    ) The blocking factor used to  distri-
*                                   bute the last  M_A-IMB_A rows of  A,
*                                   MB_A > 0.
*  NB_A    (global) DESCA( NB_    ) The blocking factor used to  distri-
*                                   bute the last  N_A-INB_A  columns of
*                                   A, NB_A > 0.
*  RSRC_A  (global) DESCA( RSRC_  ) The process row over which the first
*                                   row of the matrix  A is distributed,
*                                   NPROW > RSRC_A >= 0.
*  CSRC_A  (global) DESCA( CSRC_  ) The  process  column  over which the
*                                   first  column of  A  is distributed.
*                                   NPCOL > CSRC_A >= 0.
*  LLD_A   (local)  DESCA( LLD_   ) The  leading  dimension of the local
*                                   array  storing  the  local blocks of
*                                   the distributed matrix A,
*                                   IF( Lc( 1, N_A ) > 0 )
*                                      LLD_A >= MAX( 1, Lr( 1, M_A ) )
*                                   ELSE
*                                      LLD_A >= 1.
*
*  Let K be the number of  rows of a matrix A starting at the global in-
*  dex IA,i.e, A( IA:IA+K-1, : ). Lr( IA, K ) denotes the number of rows
*  that the process of row coordinate MYROW ( 0 <= MYROW < NPROW ) would
*  receive if these K rows were distributed over NPROW processes.  If  K
*  is the number of columns of a matrix  A  starting at the global index
*  JA, i.e, A( :, JA:JA+K-1, : ), Lc( JA, K ) denotes the number  of co-
*  lumns that the process MYCOL ( 0 <= MYCOL < NPCOL ) would  receive if
*  these K columns were distributed over NPCOL processes.
*
*  The values of Lr() and Lc() may be determined via a call to the func-
*  tion PB_NUMROC:
*  Lr( IA, K ) = PB_NUMROC( K, IA, IMB_A, MB_A, MYROW, RSRC_A, NPROW )
*  Lc( JA, K ) = PB_NUMROC( K, JA, INB_A, NB_A, MYCOL, CSRC_A, NPCOL )
*
*  Arguments
*  =========
*
*  ICTXT   (local input) INTEGER
*          On entry,  ICTXT  specifies the BLACS context handle, indica-
*          ting the global  context of the operation. The context itself
*          is global, but the value of ICTXT is local.
*
*  -- Written on April 1, 1998 by
*     Antoine Petitet, University  of  Tennessee, Knoxville 37996, USA.
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            BLOCK_CYCLIC_2D_INB, CSRC_, CTXT_, DLEN_,
     $                   DTYPE_, IMB_, INB_, LLD_, MB_, M_, NB_, N_,
     $                   RSRC_
      parameter( block_cyclic_2d_inb = 2, dlen_ = 11,
     $                   dtype_ = 1, ctxt_ = 2, m_ = 3, n_ = 4,
     $                   imb_ = 5, inb_ = 6, mb_ = 7, nb_ = 8,
     $                   rsrc_ = 9, csrc_ = 10, lld_ = 11 )
      REAL               RONE
      COMPLEX            ONE
      parameter( one = ( 1.0e+0, 0.0e+0 ),
     $                   rone = 1.0e+0 )
*     ..
*     .. External Subroutines ..
      EXTERNAL           pb_descset2
*     ..
*     .. Common Blocks ..
      CHARACTER*1        DIAG, SIDE, TRANSA, TRANSB, UPLO
      INTEGER            IA, IB, IC, INCX, INCY, ISCLR, IX, IY, JA, JB,
     $                   JC, JX, JY, KDIM, MDIM, NDIM
      REAL               USCLR
      COMPLEX            SCLR
      INTEGER            DESCA( DLEN_ ), DESCB( DLEN_ ), DESCC( DLEN_ ),
     $                   DESCX( DLEN_ ), DESCY( DLEN_ )
      COMPLEX            A( 2, 2 ), B( 2, 2 ), C( 2, 2 ), X( 2 ), Y( 2 )
      COMMON             /pblasc/diag, side, transa, transb, uplo
      COMMON             /pblasd/desca, descb, descc, descx, descy
      COMMON             /pblasi/ia, ib, ic, incx, incy, isclr, ix, iy,
     $                   ja, jb, jc, jx, jy
      COMMON             /pblasm/a, b, c
      COMMON             /pblasn/kdim, mdim, ndim
      COMMON             /pblass/sclr, usclr
      COMMON             /pblasv/x, y
*     ..
*     .. Executable Statements ..
*
*     Set default values for options
*
      diag   = 'N'
      side   = 'L'
      transa = 'N'
      transb = 'N'
      uplo   = 'U'
*
*     Set default values for scalars
*
      kdim   = 1
      mdim   = 1
      ndim   = 1
      isclr  = 1
      sclr   = one
      usclr  = rone
*
*     Set default values for distributed matrix A
*
      a( 1, 1 ) = one
      a( 2, 1 ) = one
      a( 1, 2 ) = one
      a( 2, 2 ) = one
      ia = 1
      ja = 1
      CALL pb_descset2( desca, 2, 2, 1, 1, 1, 1, 0, 0, ictxt, 2 )
*
*     Set default values for distributed matrix B
*
      b( 1, 1 ) = one
      b( 2, 1 ) = one
      b( 1, 2 ) = one
      b( 2, 2 ) = one
      ib = 1
      jb = 1
      CALL pb_descset2( descb, 2, 2, 1, 1, 1, 1, 0, 0, ictxt, 2 )
*
*     Set default values for distributed matrix C
*
      c( 1, 1 ) = one
      c( 2, 1 ) = one
      c( 1, 2 ) = one
      c( 2, 2 ) = one
      ic = 1
      jc = 1
      CALL pb_descset2( descc, 2, 2, 1, 1, 1, 1, 0, 0, ictxt, 2 )
*
*     Set default values for distributed matrix X
*
      x( 1 ) = one
      x( 2 ) = one
      ix = 1
      jx = 1
      CALL pb_descset2( descx, 2, 1, 1, 1, 1, 1, 0, 0, ictxt, 2 )
      incx = 1
*
*     Set default values for distributed matrix Y
*
      y( 1 ) = one
      y( 2 ) = one
      iy = 1
      jy = 1
      CALL pb_descset2( descy, 2, 1, 1, 1, 1, 1, 0, 0, ictxt, 2 )
      incy = 1
*
      RETURN
*
*     End of PCSETPBLAS
*

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