Well, is it a hang or a loop? Do a few
D J,jobname
to see if the CPU is going up.
Then issue the DUMP command to trap it.
If a loop, look at the system trace table. It may be constantly reissuing an
SVC, such as not clearing an ECB and reissuing the WAIT (yes, I have done
that). Or you will see a lot of clock interrupts indicating a harder loop but
you will see the PSW location.
If a WAIT, you will need to examine the various tasks to see why. Will be more
complex.
On Sun, 19 May 2024 20:41:51 -0500 Steve Estle
<[email protected]> wrote:
:>Hello All,
:>
:>Way back in the day I used to read dumps fairly handily in the MVS/XA era.
But have been away for so long I know things have evolved but appears
everything is basically still intact relative to ASCB to PRB relationships.
I'm working on a hang/loop condition that prevents started task from being
stopped normally (P STC) and have taken SVC dump and want to interpret it. I'm
somewhat fluent with IPCS and can bring up via panels, but from there am
struggling with where to go to identify where the hang/loop condition is
happening.
:>
:>Any shares of doc, presentations, tips, etc. are much appreciated as I still
think this is one of the lost arts that in the end to be a top notch systems
programmer you need to be able to interpret. I know IBM used to teach whole
classes on this but believe much of that has gone way of dodo bird...
:>
:>Thanks in advance.
:>
:>Steve Estle
:>
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--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com
Director, Dissen Software, Bar & Grill - Israel
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