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PROGRAM DSECNDTST
*
* -- LAPACK test routine (version 3.3.1) --
* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
* -- April 2011 --
*
* =====================================================================
*
* .. 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
* ..
* .. 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
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