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PROGRAM TEST5
*
* -- LAPACK test routine (version 3.2) --
* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
* November 2006
*
* .. Parameters ..
INTEGER NMAX, ITS
PARAMETER ( NMAX = 100, ITS = 5000 )
* ..
* .. Local Scalars ..
INTEGER I, J
DOUBLE PRECISION ALPHA, AVG, T1, T2, TNOSEC
* ..
* .. Local Arrays ..
DOUBLE PRECISION X( NMAX ), Y( NMAX )
* ..
* .. External Functions ..
DOUBLE PRECISION DSECND
EXTERNAL DSECND
* ..
* .. Intrinsic Functions ..
INTRINSIC DBLE
* ..
* .. Executable Statements ..
*
*
* 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 1,000,000 DAXPY 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( )
WRITE( 6, 9999 )T2 - T1
IF( T2-T1.GT.0.0D0 ) THEN
WRITE( 6, 9998 )1.0D0 / ( T2-T1 )
ELSE
WRITE( 6, 9994 )
END IF
TNOSEC = T2 - T1
*
* Time 1,000,000 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 in milliseconds used by an average call
* to DSECND.
*
WRITE( 6, 9997 )T2 - T1
AVG = ( ( T2-T1 )-TNOSEC )*1000.D0 / DBLE( ITS )
WRITE( 6, 9996 )AVG
*
* Compute the equivalent number of floating point operations used
* by an average call to DSECND.
*
IF( TNOSEC.GT.0.0D0 )
$ WRITE( 6, 9995 )1000.D0*AVG / TNOSEC
*
9999 FORMAT( ' Time for 1,000,000 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( ' *** Error: Time for operations was zero' )
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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