On Sat, 24 Feb 2024 19:50:32 +0000, Jim Mulder <[email protected]> wrote:

>  I would say that STCKF is less "approximate" than STCK, since STCKF can have 
> more low order bits of time from the clock than
>STCK, which inserts a processor related value in the low order bits to meet 
>the "unique with a partition" requirement.  
>STCKF is fine for measure time deltas as long as a delta of 0 is acceptable.  
>z/OS routinely uses STCKF for this purpose.
>You won't observe time flowing backward from two STCKFs on the same logical 
>processor or the same z/OS work unit.

Hi, Jim.  I meant that if you want to really know what time it is, you can't 
use STCKF.

Alan Altmark
IBM

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