Look at "CPU-Time Variation" in the z/OS 2.1 SMF manual. It states 

" There are many reasons why CPU time varies between different runs of the same
job or job step. The following list describes some of the major causes of 
variation:........"
and the goes on to enumerate many possible causes.

Although I can't find it in this version of the manual, there was a statement 
in the past that indicated CPU time could *NOT* be expected to be identical 
between multiple runs of the same job/step/input/output combination.

HTH,

<snip>:
> Hello. I have a program that i am executing 2 times the number of records 
> that is processed is same in both the time, but i am seeing CPU execution 
> times are different. Can someone throw some light on why this is comming as 
> different?
</snip>


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