128 lines
3.4 KiB
Fortran
128 lines
3.4 KiB
Fortran
*> \brief \b DSECNDTST
|
|
*
|
|
* =========== DOCUMENTATION ===========
|
|
*
|
|
* Online html documentation available at
|
|
* http://www.netlib.org/lapack/explore-html/
|
|
*
|
|
* Definition:
|
|
* ===========
|
|
*
|
|
* PROGRAM DSECNDTST
|
|
*
|
|
* Authors:
|
|
* ========
|
|
*
|
|
*> \author Univ. of Tennessee
|
|
*> \author Univ. of California Berkeley
|
|
*> \author Univ. of Colorado Denver
|
|
*> \author NAG Ltd.
|
|
*
|
|
*> \date November 2017
|
|
*
|
|
*> \ingroup auxOTHERauxiliary
|
|
*
|
|
* ===================================================================== PROGRAM DSECNDTST
|
|
*
|
|
* -- LAPACK test routine (version 3.8.0) --
|
|
*
|
|
* -- LAPACK computational routine (version 3.8.0) --
|
|
* -- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
* November 2017
|
|
*
|
|
* =====================================================================
|
|
*
|
|
* .. Parameters ..
|
|
INTEGER NMAX, ITS
|
|
PARAMETER ( NMAX = 1000, ITS = 50000 )
|
|
* ..
|
|
* .. Local Scalars ..
|
|
INTEGER I, J
|
|
DOUBLE PRECISION ALPHA, AVG, T1, T2, TNOSEC, TOTAL
|
|
* ..
|
|
* .. Local Arrays ..
|
|
DOUBLE PRECISION X( NMAX ), Y( NMAX )
|
|
* ..
|
|
* .. External Functions ..
|
|
DOUBLE PRECISION DSECND
|
|
EXTERNAL DSECND
|
|
* ..
|
|
* .. External Subroutines ..
|
|
EXTERNAL MYSUB
|
|
* ..
|
|
* .. Intrinsic Functions ..
|
|
INTRINSIC DBLE
|
|
* ..
|
|
* .. Executable Statements ..
|
|
*
|
|
* .. Figure TOTAL flops ..
|
|
TOTAL = DBLE(NMAX) * DBLE(ITS) * 2.0
|
|
*
|
|
* Initialize X and Y
|
|
*
|
|
DO 10 I = 1, NMAX
|
|
X( I ) = DBLE( 1 ) / DBLE( I )
|
|
Y( I ) = DBLE( NMAX-I ) / DBLE( NMAX )
|
|
10 CONTINUE
|
|
ALPHA = 0.315D0
|
|
*
|
|
* Time TOTAL SAXPY operations
|
|
*
|
|
T1 = DSECND( )
|
|
DO 30 J = 1, ITS
|
|
DO 20 I = 1, NMAX
|
|
Y( I ) = Y( I ) + ALPHA*X( I )
|
|
20 CONTINUE
|
|
ALPHA = -ALPHA
|
|
30 CONTINUE
|
|
T2 = DSECND( )
|
|
TNOSEC = T2 - T1
|
|
WRITE( 6, 9999 )TOTAL, TNOSEC
|
|
IF( TNOSEC.GT.0.0 ) THEN
|
|
WRITE( 6, 9998 )(TOTAL/1.0D6)/TNOSEC
|
|
ELSE
|
|
WRITE( 6, 9994 )
|
|
END IF
|
|
*
|
|
* Time TOTAL DAXPY operations with DSECND in the outer loop
|
|
*
|
|
T1 = DSECND( )
|
|
DO 50 J = 1, ITS
|
|
DO 40 I = 1, NMAX
|
|
Y( I ) = Y( I ) + ALPHA*X( I )
|
|
40 CONTINUE
|
|
ALPHA = -ALPHA
|
|
T2 = DSECND( )
|
|
50 CONTINUE
|
|
*
|
|
* Compute the time used in milliseconds used by an average call
|
|
* to DSECND.
|
|
*
|
|
WRITE( 6, 9997 )T2 - T1
|
|
AVG = ( ( T2-T1 ) - TNOSEC ) * 1000.0D+00/DBLE( ITS )
|
|
IF( AVG.GT.0.0)
|
|
$ WRITE( 6, 9996 )AVG
|
|
*
|
|
* Compute the equivalent number of floating point operations used
|
|
* by an average call to DSECND.
|
|
*
|
|
IF(( AVG.GT.0.0 ).AND.( TNOSEC.GT.0.0 ))
|
|
$ WRITE( 6, 9995 )(AVG/1000) * TOTAL / TNOSEC
|
|
*
|
|
9999 FORMAT( ' Time for ', G10.3,' DAXPY ops = ', G10.3, ' seconds' )
|
|
9998 FORMAT( ' DAXPY performance rate = ', G10.3, ' mflops ' )
|
|
9997 FORMAT( ' Including DSECND, time = ', G10.3, ' seconds' )
|
|
9996 FORMAT( ' Average time for DSECND = ', G10.3,
|
|
$ ' milliseconds' )
|
|
9995 FORMAT( ' Equivalent floating point ops = ', G10.3, ' ops' )
|
|
9994 FORMAT( ' *** Warning: Time for operations was less or equal',
|
|
$ ' than zero => timing in TESTING might be dubious' )
|
|
CALL MYSUB(NMAX,X,Y)
|
|
END
|
|
SUBROUTINE MYSUB(N,X,Y)
|
|
INTEGER N
|
|
DOUBLE PRECISION X(N), Y(N)
|
|
RETURN
|
|
END
|