On 18/05/2021 6:35 pm, Andrew Rowley wrote:
On 18/05/2021 5:21 pm, David Crayford wrote:
Do they have a zIIP on the RDP system?
Yes, although the regular CPs are the same speed. Having the zIIP
means I can get figures for zIIP, CP and zIIP on CP.
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. Most small/medium sized customers
run sub-capacity so the GCPs are way below zIIP speeds. That's your
market, right?
Are you talking about CMF 110 records? If so we've both worked on
similar stuff. One of our products is a CICS Performance Analyzer.
It's written in HLASM. A couple of years ago the CTO at the time was
interested in using Java to process
SMF records and me to port the HLASM code to Java. When we ran it on
our z13s the Java code smashed the HLASM. The reason was because the
Jave was running on a full capacity zIIP and the HLASM code on a
sub-capacity GP.
BTW, what kind of compression do you mean?
Yes, the CMF 110 records. I decompress the RLE compression in the
record in Java. That means that the data can be processed on a PC if
desired. (I even processed CICS SMF data on a Raspberry Pi to prove it
could be done!)
I'm happy to use the standard operating system facilities to
decompress data from the SMF logstreams. Sometimes it would be nice to
get the compressed data e.g. if I'm just going to compress it again to
transfer somewhere else, but for reporting the uncompressed data is
what I want.
You can't do that if you use the JZos Zlogstream class to read the
logstream and zEDC is in play. It's not too difficult to reverse
engineer if you can work out the headers and how to interpret the raw
zlib payload.
Andrew Rowley
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