Happy New Year to all.
I'm looking at product usage data in SMF 89 subtype 1 records, and I see that
TCB and SRB values go up and down, and look like reasonable interval values.
The SMF89UZT field for offloaded CPU time, however, only seems to go up and
makes it look suspiciously like it is just a snapshot of the counter reading,
not the true interval (delta) value for that interval.
The snippet below is for z/OSMF, but I can also see the same happens for IBM
products like DB2, MQ, Websphere and IBM Integration Bus (IB).
SMF DATE/TIME SRBTCBOFFLOAD
30 DEC 2019 00:00:00.00 0:00:00.01 0:00:00.33 1:31:58.37
30 DEC 2019 00:05:00.00 0:00:00.01 0:00:00.29 1:31:59.12
30 DEC 2019 00:10:00.00 0:00:00.01 0:00:00.32 1:31:59.86
30 DEC 2019 00:15:00.00 0:00:00.01 0:00:00.36 1:32:00.57
30 DEC 2019 00:20:00.00 0:00:00.00 0:00:00.30 1:32:01.30
30 DEC 2019 00:25:00.00 0:00:00.00 0:00:00.30 1:32:02.05
30 DEC 2019 00:30:00.00 0:00:00.01 0:00:00.34 1:32:02.79
I don't have any non-IBM product data with offload engine usage to check, so if
anyone who does have would be prepared to have a look at their data and report
back, that would be very useful. Whatever the results, I think there are some
questions to pose to IBM:
Is the SMF89UZT field cumulative for all products? If so, please can you
document that in the SMF record description.
Is the SMF89UZT field cumulative only for IBM products? If so, please can you
document that in the SMF record description.
Is the SMF89UZT field meant to be an interval value? If so, please can you fix
the z/OS code so it is.
Any additional thoughts or comments are most welcome.
Best wishes
Nick
Nick Varley
Director, Customer Support
p +44 (0) 1823 226012 | m +44 (0) 7766 806780
nick.var...@syncsort.com
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