RE: Reducing Batch Job Run Time

["Charly Jones" <charly301@xxxxxxxxxxx>]

If running them all at once as Jim suggests doesn't give you what
you are looking for, try running them one at a time without
memory contention.  Try a batch subsystem with a single threaded
job queue and a _dedicated_ pool of memory.  Not *BASE, not a
*SHRPOOL, not shared with any other process.  If you give a batch
job enough dedicated memory - they sometimes run a lot faster.  You
can tell if you have enough memory by watching the "non-database
faulting rate" on the WRKSYSSTS screen.  If you have more than a
few faults per second for an elapsed time of several minutes, you can
probably speed up that phase of that batch job by adding memory to the
dedicated pool it is running in.

The amount of memory required for some batch jobs to run well in
a dedicated environment is suprisingly small... sometimes 5 or 10
megabytes is plenty.

Try both settings of "expert cache"  - sometimes it makes a big
difference, but it depends on the job which setting is better.


Charly Jones
253 851-9876
Gig Harbor Washington

---------------------

>From: "Jim Langston" <jlangston@celsinc.com>
>Reply-To: midrange-l@midrange.com
>To: "Midrange-L" <midrange-l@midrange.com>
>Subject: RE: Reducing Batch Job Run Time
>Date: Thu, 6 Sep 2001 14:10:49 -0700
>
>The thing I would do would be to submit each of the 10 different
>programs at one time.  If you have a single threaded job queue,
>that won't help you, so you may want to create or modify a job
>queue to allow more than one job to run at a time.
>
>SBMJOB CMD(CALL PGM(MYLIB/MYPGM1)) JOBQ(MULTIJOB)
>SBMJOB CMD(CALL PGM(MYLIB/MYPGM2)) JOBQ(MULTIJOB)
>SBMJOB CMD(CALL PGM(MYLIB/MYPGM3)) JOBQ(MULTIJOB)
>.
>.
>.
>
>That would allow them to run all at once, and you may get an
>exceptional increase in the total process time (1/10th the time
>or 24 minutes) or next to no saving at all, depending on what
>is taking the jobs so long to run (is it CPU time, DASD wait
>time, etc...)
>
>
>Regards,
>
>Jim Langston
>Programmer/Analyst
>Cels Enterprises, Inc.
>
>-----Original Message-----
>From: rpg400-l-admin@midrange.com [mailto:rpg400-l-admin@midrange.com]On
>Behalf Of Ray Nainy
>Sent: Thursday, September 06, 2001 12:37 PM
>To: RPG400-L@midrange.com
>Subject: Reducing Batch Job Run Time
>
>
>Hi all,
>
>What are the best options available to reduce the batch job run time?
>We have a daily batch job which runs about 4 hours, and which calls 10
>different programs. All these programs are independent of each other and
>can
>be called in any sequence. Looking for best options to reduce the batch job
>run time.
>
>thanks in advance.
>
>Ray
>
>
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