SYNOPSIS¶
- PROGRAM TEST4
INTEGER NMAX, ITS PARAMETER ( NMAX = 100, ITS = 5000 ) INTEGER I,
J REAL ALPHA, AVG, T1, T2, TNOSEC REAL X( NMAX ), Y( NMAX ) REAL SECOND
EXTERNAL SECOND INTRINSIC REAL DO 10 I = 1, NMAX X( I ) = REAL( 1 ) / REAL(
I ) Y( I ) = REAL( NMAX-I ) / REAL( NMAX ) 10 CONTINUE ALPHA = 0.315 T1 =
SECOND( ) DO 30 J = 1, ITS DO 20 I = 1, NMAX Y( I ) = Y( I ) + ALPHA*X( I )
20 CONTINUE ALPHA = -ALPHA 30 CONTINUE T2 = SECOND( ) WRITE( 6, 9999 )T2 -
T1 IF( T2-T1.GT.0.0 ) THEN WRITE( 6, 9998 )1.0 / ( T2-T1 ) ELSE WRITE( 6,
9994 ) END IF TNOSEC = T2 - T1 T1 = SECOND( ) DO 50 J = 1, ITS DO 40 I = 1,
NMAX Y( I ) = Y( I ) + ALPHA*X( I ) 40 CONTINUE ALPHA = -ALPHA T2 = SECOND(
) 50 CONTINUE WRITE( 6, 9997 )T2 - T1 AVG = ( ( T2-T1 ) - TNOSEC ) *
1000./REAL( ITS ) WRITE( 6, 9996 )AVG IF( TNOSEC.GT.0.0 ) WRITE( 6, 9995
)1000.*AVG / TNOSEC 9999 FORMAT( ' Time for 1,000,000 SAXPY ops = ', G10.3,
' seconds' ) 9998 FORMAT( ' SAXPY performance rate = ', G10.3, ' mflops ' )
9997 FORMAT( ' Including SECOND, time = ', G10.3, ' seconds' ) 9996 FORMAT(
' Average time for SECOND = ', 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 REAL X(N), Y(N) RETURN END