> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of Walt Farrell
>
> On Fri, 7 Mar 2008 12:02:25 -0600, McKown, John wrote:
>
> >Well, in the case of CICS, I was wrong. The manual states:
> >
> ><quote>
> >If the task is to be attached, DFHZCNA obtains a TIOA and moves the
> >data from the CIB to the TIOA. DFHZATT is then called to attach the
> >task. If the attach fails, the TIOA is freed. A QEDIT macro frees the
> >CIB if the attach is successful, and the scan continues.
> ></quote>
> >
> >So the CIB (command input buffer?) is freed once the transaction is
> >ATTACHed, not once it finishes. However, in the case of a single
> >console, this is almost the same thing.
>
> However, in the OP's case they're submitting commands via
> JCL, and I believe JES will pump those commands through very
> fast as it reads the job. I could easily see JES issuing a
> series of commands to a single CICS region much faster than
> CICS could read each one and tell the system that it had done so.
>
> You have, in essence, two processes running:
>
> (1) Issue command
> Issue another one
> Issue another one
> ...
>
> There are no delays between the commands.
>
> And you have process 2,
> (2) Read a command
> Tell system you're ready for another one
>
> It would be quite easy for process 1 to drive commands faster
> than process 2 can remove them.
>
> Of course, this is all my guess about what the OP's job
> contained, and what JES and CICS would do.
Looks like a simple case of "stacking" too many MODIFY commands in a
single jobstream. In the job output they showed me, there are 1,012
MODIFY commands "stacked" for the same "terminal" (the INSTREAM console,
in this case). Since CIBCTR cannot exceed 255, it appears that the CICS
region simply "got lapped" before the batch job ran out of commands to
issue.
Thanks also to John McKown and Chris Craddock for pointing me to the
right manuals.
-jc-
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