On 19/04/2024 9:35 pm, Scott Chapman wrote:
Agreed, it's been many years since I ran similar test with our software and
don't remember the exact details, but my recollection is that I saw no
noticeable change in CPU consumption. Which I remember being particularly
interested in because I'd heard of issues reading that compressed data.
I did some experiments with SMF data with and without zEDC. What I saw
in my test:
- zEDC I/O was much faster, reducing elapsed time by more than 10x in
some cases
- CPU time for compression seemed to be less than 0.2s per GB
- CICS software compression greatly reduced the CPU time for copying the
zEDC compressed data e.g. if you have weekly/monthly SMF housekeeping
Also some interesting results processing zEDC compressed data with Java.
zEDC actually reduced the amount of time on the general purpose CPs - it
seems like more of the work ended up on the zIIPs. Reporting on 39GB of
zEDC compressed CICS data used only 2s CP / 38.6s zIIP time, compared to
5.6s CP time reading the data with IFASMFDP. Reading the 6.6 GB dataset
in Java used 1.49s CP time without zEDC, 1.25s CP time with zEDC (plus
zIIP time).
You can read the details here:
https://www.blackhillsoftware.com/news/2024/04/29/using-zedc-compression-for-smf-data/
--
Andrew Rowley
Black Hill Software
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