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125 lines
3.4 KiB
125 lines
3.4 KiB
2 years ago
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*> \brief \b DSECNDTST
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*
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* =========== DOCUMENTATION ===========
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*
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* Online html documentation available at
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* http://www.netlib.org/lapack/explore-html/
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*
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* Definition:
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* ===========
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*
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* PROGRAM DSECNDTST
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*
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* Authors:
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* ========
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*
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*> \author Univ. of Tennessee
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*> \author Univ. of California Berkeley
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*> \author Univ. of Colorado Denver
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*> \author NAG Ltd.
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*
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*> \ingroup auxOTHERauxiliary
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*
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* ===================================================================== PROGRAM DSECNDTST
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*
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* -- LAPACK test routine --
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*
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* -- LAPACK computational routine --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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*
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* =====================================================================
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*
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* .. Parameters ..
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INTEGER NMAX, ITS
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PARAMETER ( NMAX = 1000, ITS = 50000 )
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* ..
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* .. Local Scalars ..
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INTEGER I, J
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DOUBLE PRECISION ALPHA, AVG, T1, T2, TNOSEC, TOTAL
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* ..
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* .. Local Arrays ..
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DOUBLE PRECISION X( NMAX ), Y( NMAX )
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* ..
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* .. External Functions ..
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DOUBLE PRECISION DSECND
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EXTERNAL DSECND
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* ..
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* .. External Subroutines ..
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EXTERNAL MYSUB
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* ..
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* .. Intrinsic Functions ..
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INTRINSIC DBLE
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* ..
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* .. Executable Statements ..
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*
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* .. Figure TOTAL flops ..
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TOTAL = DBLE(NMAX) * DBLE(ITS) * 2.0
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*
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* Initialize X and Y
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*
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DO 10 I = 1, NMAX
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X( I ) = DBLE( 1 ) / DBLE( I )
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Y( I ) = DBLE( NMAX-I ) / DBLE( NMAX )
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10 CONTINUE
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ALPHA = 0.315D0
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*
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* Time TOTAL SAXPY operations
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*
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T1 = DSECND( )
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DO 30 J = 1, ITS
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DO 20 I = 1, NMAX
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Y( I ) = Y( I ) + ALPHA*X( I )
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20 CONTINUE
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ALPHA = -ALPHA
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30 CONTINUE
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T2 = DSECND( )
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TNOSEC = T2 - T1
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WRITE( 6, 9999 )TOTAL, TNOSEC
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IF( TNOSEC.GT.0.0 ) THEN
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WRITE( 6, 9998 )(TOTAL/1.0D6)/TNOSEC
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ELSE
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WRITE( 6, 9994 )
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END IF
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*
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* Time TOTAL DAXPY operations with DSECND in the outer loop
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*
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T1 = DSECND( )
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DO 50 J = 1, ITS
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DO 40 I = 1, NMAX
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Y( I ) = Y( I ) + ALPHA*X( I )
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40 CONTINUE
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ALPHA = -ALPHA
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T2 = DSECND( )
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50 CONTINUE
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*
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* Compute the time used in milliseconds used by an average call
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* to DSECND.
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*
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WRITE( 6, 9997 )T2 - T1
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AVG = ( ( T2-T1 ) - TNOSEC ) * 1000.0D+00/DBLE( ITS )
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IF( AVG.GT.0.0)
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$ WRITE( 6, 9996 )AVG
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*
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* Compute the equivalent number of floating point operations used
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* by an average call to DSECND.
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*
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IF(( AVG.GT.0.0 ).AND.( TNOSEC.GT.0.0 ))
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$ WRITE( 6, 9995 )(AVG/1000) * TOTAL / TNOSEC
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*
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9999 FORMAT( ' Time for ', G10.3,' DAXPY ops = ', G10.3, ' seconds' )
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9998 FORMAT( ' DAXPY performance rate = ', G10.3, ' mflops ' )
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9997 FORMAT( ' Including DSECND, time = ', G10.3, ' seconds' )
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9996 FORMAT( ' Average time for DSECND = ', G10.3,
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$ ' milliseconds' )
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9995 FORMAT( ' Equivalent floating point ops = ', G10.3, ' ops' )
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9994 FORMAT( ' *** Warning: Time for operations was less or equal',
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$ ' than zero => timing in TESTING might be dubious' )
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CALL MYSUB(NMAX,X,Y)
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END
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SUBROUTINE MYSUB(N,X,Y)
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INTEGER N
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DOUBLE PRECISION X(N), Y(N)
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RETURN
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END
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