W dniu 2016-10-25 o 04:55, Jesse 1 Robinson pisze:
OK, consider this case. All defaults, no TIME= coded anywhere. JES2 parms have
TIME=3. Five steps. How long will the job run?
Answer: it depends.
First: we talk about CPU time, not "wall clock" time.
Second: we know there is a limit 3 minutes for whole job. Maybe each
step consume 2 seconds, then 2x5steps = 10s CPU.
Assumed first step consumed 30s the limit for the rest of the job is
(2,30). Assumed second step consumed 10s, the limit for the remaining
steps is (2,20), etc.
Geeneral rules:
TIME=value coded in JOB can only DECREASE default value.
TIME=NOLIMIT or TIME=1440 in JOB card INCREASE the default to infinity
(no time limit)
TIME coded in EXEC can INCREASE or DECREASE default value.
TIME=NOLIMIT or TIME=1440 in EXEC card INCREASE the default to infinity
(no time limit)
When coded both JOB and EXEC, the most restrictive value is in effect.
Examples (for one-step job):
jobclass ; JOBcard ; EXEC ; effective
60 ; none ; none ; 60
60 ; none ; 10 ; 10
60 ; 70 ; none ; 60 - job value ignored
60 ; 20 ; none ; 20 - job value decreased default
60 ; 20 ; 10 ; 10 - most restrictive from
(job, exec)
60 ; 20 ; 90 ; 20 - most restrictive from
(job, exec)
60 ; none ; 90 ; 90 - increased
60 ; 50 ; 1440 ; 50 - most restrictive from (job,
exec)
60 ; 1440 ; none ; NOLIMIT
60 ; none ; 1440 ; NOLIMIT
Rule of thumb: KISS!
Keep It Simple!
Don't code TIME in both JOB and EXEC
Be generous when setting default values. In case of TIME exhaustion
abend the most common scenario is to repeat the job with (hopefully!)
bigger time limit.
So, setting time default small is a waste of time! ;-)
HTH
--
Radoslaw Skorupka
Lodz, Poland
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