RE: RUN PRIORITY &CPU question

[Steve Morrison <smorrison@xxxxxxxxxxxxx>]

Muralidhar,

Run Priority is relative to other jobs currently active on the system. If a
job at run priority 99 is running as the only job on the computer, it will
use as much CPU as it can. In addition, differences between the run priority
of two jobs is absolute, not relative. In other words, one job running at
priority 20 will always take priority over another job with lower priority,
whether that other job has priority 21 or priority 99, as long as the job
has something for the CPU to do. 

CPU usage is also affected by disk usage. If a job is reading/writing a lot
of data to disk, this will limit how much CPU the job can use. We have
several jobs that run about 12 hours, but the CPU usage at these times (over
the weekend) is less than 5%, because the jobs are spending all of their
time reading from disk, and not processing the data. 

You say that the job took more time than usual. How many other jobs were
running at the dame time? Was there a larger than normal file to process?
Check the job log to compare the CPU seconds used with an earlier run, to
see if there was an increase in processing time, or only in the run time.


Steve Morrison
Beacon Insurance
940-720-4672 

-----Original Message-----
From: Muralidhar Narayana [mailto:Muralidhar_Narayana@xxxxxxxxxxx] 
Sent: Wednesday, September 01, 2004 11:19 AM
To: midrange-l@xxxxxxxxxxxx
Subject: RUN PRIORITY &CPU question

Hi 
There is a problem in running a batch. In the beginning of batch I have seen
CHGJOB   005   RUNPTY(19) BRKMSG(*HOLD) 
I aslo saw batch ran at priority 20, I changed it to 15.
But somehow it was changed back to 20.
I also saw CPU used was 2-8 %.
The batch took more time than usal time of processing,
Can any one give me your valuable suggestions,
is something wrong with priority?
CPU usage figures indicate what?
Thank you for your help.,

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