On 19/05/2021 8:14 am, Andrew Rowley wrote:
That's unfortunate. It's the same where I work. We run a enterprise
class z15 and the zIIP normalized times in the SMF30s match GCP
times. What you really want is an image where you can compare code
running on a zIIP to a sub-capacity GCP
as that's the compelling reason why running your Java product is
better than REXX or home rolled HLASM code.
I don't think that matters. I want to make it perform as fast as
possible, and for that purpose it is helpful if the engines are the
same speed as it's easy to compare. Beyond that, if you run it on a
slower engine it will run slower, on a faster engine it will run
faster. The system is never going to truly replicate a customer system
anyway because one of the major performance factors is competition
with other work running on the system, and I am never going to
simulate a real production workload.
You can calculate zIIP normalization times using the RMF 79 records
using the same formula as SDSF.
I don't see zIIP as a primary reason for SMF reporting in Java. It is
a bonus. The compelling reason for Java is better performance than
Rexx (for large quantities of data) and much easier and more powerful
programming than both Rexx and HLASM. You can create reports in Java
that are impracticable in Rexx or HLASM.
I was originally doing SMF reporting in C# on Windows, and the ease of
processing data and writing reports made me decide it was worth
porting to Java (a similar language) so it could be used on z/OS.
Object oriented languages with classes representing record types are a
VERY good fit for SMF data.
Then why not write your product in C++? It would be a lot easier to
process SMF records using structs then having to write get methods in
Java. Contrary to what some people believe C++ is a very modern language
with the benefit that it's not garbage collected. We chose Java because
the value proposition of offloading to
zIIP processors is what customers want. Some of my ex-colleagues have
spent the last two years zIIP enabling SMF reporting products that are
written in PL/X. In the age of analytics where customers want near real
time analytics feeds zIIP offloading isn't a nice to have any more.
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