Tag Archives: performance

I wrote How I Look At Virtual Storage in 2014. But since then my stance has shifted somewhat. A recent study I was part of made me realise my tone on z/OS virtual storage should probably be a little more strident. In that post I was somewhat even handed about the matter, just describing myContinue reading “Time For Action On Virtual Storage?”

This post follows on from my 2019 post A Slice Of PI. Again, not Raspberry Pi but Performance Index PI. 🙂 I’ve become sensitised to how common a particular Workload Manager (WLM) problem is since I created some handy graphs. Some Graphs Recent Customers Have Seen When I examine a customer’s WLM Service Definition partContinue reading “Another Slice Of PI”

This is one of those posts where I have to be careful about what I say – to not throw a customer under the bus with over-specificity. So, bear with me on that score. Actually it’s two customers, not one. But they have the same challenge: Managing Workload Manager (WLM) service definitions for multiple sysplexes.Continue reading “One Service Definition To Rule Them All?”

(First posted February 21, 2021) As I recall, the last time I wrote about SMF 70-1 records in detail was Engineering – Part Two – Non-Integer Weights Are A Thing. Even if it weren’t, no matter – as I’d like you to take a look at it. The reason is to reacquaint you with ERBSCANContinue reading “SMF 70-1 – Where Some More Of The Wild Things Are”

It’s been quite a while since I last wrote about Coupling Facility performance. Indeed it’s a long time since I presented on it – so I might have to update my Parallel Sysplex Performance presentation soon. (For reference, that last post on CF Performance was Maskerade in early 2018.) In the past I’ve talked aboutContinue reading “Coupling Facility Structure Performance – A Multi-System View”

This post follows on from A Note On Velocity from 2015. Follows on at a respectful distance, I’d say – since it’s been 5 years. In that post I wrote “But those ideas are for another day or, more likely, another year (it being December now).” This is that other day / year – asContinue reading “More On Samples”

Every so often I get to work with a SAP customer. I’m pleased to say I’ve worked with four in recent years. I work with them sufficiently infrequently that my DDF SMF 101 Analysis code has evolved somewhat in the meantime. The customer situation I’m working with now is a good case in point. AndContinue reading “SAP And Db2 Correlation IDs”