pb_combine()

subroutine pb_combine	(	integer	ictxt,
		character*1	scope,
		character*1	op,
		character*1	tmtype,
		integer	n,
		integer	ibeg,
		double precision, dimension( n )	times
	)

Definition at line 3209 of file pblastim.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 ..
      CHARACTER*1        OP, SCOPE, TMTYPE
      INTEGER            IBEG, ICTXT, N
*     ..
*     .. Array Arguments ..
      DOUBLE PRECISION   TIMES( N )
*     ..
*
*  Purpose
*  =======
*
*  PB_COMBINE returns wall or cpu time that has accumulated in timer I.
*
*  Arguments
*  =========
*
*  TMTYPE  (global input) CHARACTER
*          On entry, TMTYPE specifies what time will be returned as fol-
*          lows
*             = 'W': wall clock time is returned,
*             = 'C': CPU time is returned (default).
*
*  I       (global input) INTEGER
*          On entry, I specifies the timer to return.
*
*  -- Written on April 1, 1998 by
*     R. Clint Whaley, University of Tennessee, Knoxville 37996, USA.
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            NTIMER
      parameter( ntimer = 64 )
      DOUBLE PRECISION   ERRFLAG
      parameter( errflag = -1.0d+0 )
*     ..
*     .. Local Scalars ..
      CHARACTER*1        TOP
      LOGICAL            TMPDIS
      INTEGER            I
*     ..
*     .. External Subroutines ..
      EXTERNAL           dgamx2d, dgamn2d, dgsum2d, pb_topget
*     ..
*     .. External Functions ..
      LOGICAL            LSAME
      DOUBLE PRECISION   DCPUTIME00, DWALLTIME00
      EXTERNAL           dcputime00, dwalltime00, lsame
*     ..
*     .. Common Blocks ..
      LOGICAL            DISABLED
      DOUBLE PRECISION   CPUSEC( NTIMER ), CPUSTART( NTIMER ),
     $                   WALLSEC( NTIMER ), WALLSTART( NTIMER )
      COMMON /sltimer00/ cpusec, wallsec, cpustart, wallstart, disabled
*     ..
*     .. Executable Statements ..
*
*     Disable timer for combine operation
*
      tmpdis = disabled
      disabled = .true.
*
*     Copy timer information into user's times array
*
      IF( lsame( tmtype, 'W' ) ) THEN
*
*        If walltime not available on this machine, fill in times
*        with -1 flag, and return
*
         IF( dwalltime00().EQ.errflag ) THEN
            DO 10 i = 1, n
               times( i ) = errflag
   10       CONTINUE
            RETURN
         ELSE
            DO 20 i = 1, n
               times( i ) = wallsec( ibeg + i - 1 )
   20       CONTINUE
         END IF
      ELSE
         IF( dcputime00().EQ.errflag ) THEN
            DO 30 i = 1, n
               times( i ) = errflag
   30       CONTINUE
            RETURN
         ELSE
            DO 40 i = 1, n
               times( i ) = cpusec( ibeg + i - 1 )
   40       CONTINUE
         END IF
      ENDIF
*
*     Combine all nodes' information, restore disabled, and return
*
      IF( op.EQ.'>' ) THEN
         CALL pb_topget( ictxt, 'Combine', scope, top )
         CALL dgamx2d( ictxt, scope, top, n, 1, times, n, -1, -1,
     $                 -1, -1, 0 )
      ELSE IF( op.EQ.'<' ) THEN
         CALL pb_topget( ictxt, 'Combine', scope, top )
         CALL dgamn2d( ictxt, scope, top, n, 1, times, n, -1, -1,
     $                 -1, -1, 0 )
      ELSE IF( op.EQ.'+' ) THEN
         CALL pb_topget( ictxt, 'Combine', scope, top )
         CALL dgsum2d( ictxt, scope, top, n, 1, times, n, -1, 0 )
      ELSE
         CALL pb_topget( ictxt, 'Combine', scope, top )
         CALL dgamx2d( ictxt, scope, top, n, 1, times, n, -1, -1,
     $                 -1, -1, 0 )
      END IF
*
      disabled = tmpdis
*
      RETURN
*
*     End of PB_COMBINE
*

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