Running both with RPTSTG(ON) may provide insight.
See also: http://www-01.ibm.com/support/docview.wss?uid=swg27018287&aid=1

Kirk Wolf
Dovetailed Technologies
http://dovetail.com

On Mon, Jul 24, 2017 at 4:32 PM, Way, Richard <richard....@hpe.com> wrote:

> Same result, same return code - yes.   Customer found that one release of
> our product got an 878 when a prior release had not.  I was experimenting
> to see if I could drive the 878 by finding the point (REGION=xxxx) at which
> the 878 first occurs in the two releases of our product (to see if it was
> just "normal" additional memory needs or something more sinister). As it
> turned out, I got this other behavior (wild CPU consumption) in the course
> of experimentation.
>
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> Behalf Of Allan Kielstra
> Sent: Monday, July 24, 2017 2:27 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: REGION=0M leads to CPU through the roof
>
> I want to be clear on one thing....The program produces the same result
> and has the same return code in both cases?  Possibly another way of asking
> the same thing is:  why did you alter the region size in the first place?
>
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