Sorry about my bad memory regarding the defaults for PCEDEF.
I went back through my init deck notes and found a comment
from 10 OCT 1999 saying that I set most of the PCEDEFs to 10
based on Chip Wood's presentation at SHARE 93. (Chicago, AUG 1999)
This was probably session 2658 JES2 Configuration & Tuning Tips.
SHARE's online handouts do not appear to go back that far, but
the abstract for the session said:
Is your JES system running as well as it should? There are
some simple things you may be able to do which can improve
the efficiency or availability of your system. In this
session, a representative from JES2 development will
discuss:
(.) Initialization statements which must be coded, or for
which the default is not the best choice,
(.) Tuning tips to improve performance of checkpoint and
spool,
(.) Recommendations for maximizing the availability of your
JESplex.
I would guess that I would not have set these values to the max
if any potential downside had been mentioned at the session.
/jack
----- Original Message -----
From: "Richards, Robert B." <robert.richa...@opm.gov>
Newsgroups: bit.listserv.ibm-main
To: <IBM-MAIN@BAMA.UA.EDU>
Sent: Friday, January 30, 2009 6:54 AM
Subject: Re: $P JOBQ Question
Rick,
Thanks for the reminder. Wow, 8 years ago. Time flies.... Back on topic:
Anyone experience any downside to specifying the maximum?
Bob
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On
Behalf Of Rick Fochtman
Sent: Thursday, January 29, 2009 12:27 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: $P JOBQ Question
-----------------------------------<snip>---------------------------
I looked at the JES2 Init and Tuning Reference manual and it indicates
that the default value is "2", not "10". 10 is the maximum value that
can be specified.
I would be interested in the rationale from anyone who has the maximum
values set.
---------------------------------<unsnip>--------------------------
Bob, we discussed this when you were at Clearing. We ran an automatic
command at midnight every night to purge old test garbage from the
spool. Because of the nature of our processing, the fewer PCEDEFs we
had, the longer it took, on rare occaissions running into morning
processing and impacting job turnaround times.
And you KNOW how upset people got around there when things showed any
slowing down! :-))
Rick
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