SET RUN TIME CLOCK RESOLUTION?

My reading of the documentation says that I can use this construct:

SET RUN TIME CLOCK RESOLUTION LOW

to set the value returned by GET RUN TIME to be milliseconds. A:

SET RUN TIME CLOCK RESOLUTION HIGH

would return microseconds.

In a simple test program it doesn't seem to make any difference. The value returned by GET RUN TIME is always microseconds.

Here's the demo program:

REPORT ZPERFTEST2.

tables: TSTC.

data: s_time type i.

data: e_time type i.

data: total type i.

SET RUN TIME CLOCK RESOLUTION HIGH.

get run time field s_time.

DO 10000 times.

• Waste some time..

SELECT SINGLE * FROM TSTC

WHERE PGMNA = 'SAPLC11E'.

ENDDO.

get run time field e_time.

total = e_time - s_time.

write: / s_time, ' ',

e_time, ' ',

total.

Any ideas?