performance – Mainframe, Performance, Topics

What’s The Use?

It’s “Sun Up” on Conference Season – and I have a new presentation. It’s called “What’s The Use?” And it’s a collaboration with Scott Ballentine of z/OS Development. It’s very much a “field guy meets product developer” sort of thing. It emerged from a conversation on IBM’s internal Slack system. The idea is very simple:Continue reading “What’s The Use?”

Periodicity

When I examine Workload Manager for a customer a key aspect is goal setting. This has a number of aspects: How work gets classified – to which Service Class and Report Class by what rules. What the goals are for each Service Class Period. What the period boundaries should be. This post focuses on AspectContinue reading “Periodicity”

Four Coupling Facilities

This isn’t following on from Three Billboards? 🙂 but rather Shared Coupling Facility CPU And DYNDISP from 2016. I’m not sure it adds much that’s new but this set of customer data was an opportunity too good to miss… … It enables me to graph most of the Coupling Facility LPAR types you’re likely toContinue reading “Four Coupling Facilities”

Three Billboards?

You could consider presentations as advertising – either for what you’ve done or for what something can do. Generally my presentations are in the category of “Public Service Announcement”. Which rather combines the two: What I’ve found I can do – that you might want to replicate. What I’ve found a product can do –Continue reading “Three Billboards?”

Time For Action On Virtual Storage?

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?”

Another Slice Of PI

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”

One Service Definition To Rule Them All?

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?”

Mainframe Performance Topics Podcast Episode 29 “Hello Trello”

This was a fun episode to make, not least because it featured as a guest Miroslava Barahona Rossi. She’s one of my mentees from Brasil and she’s very good. We made it over a period of a few weeks, fitting around unusually busy “day job” schedules for Marna and I. And this one is oneContinue reading “Mainframe Performance Topics Podcast Episode 29 “Hello Trello””

Mainframe Performance Topics Podcast Episode 28 “The Preview That We Do Anew”

(Originally posted 2 March, 2021.) It’s unusual for us to publish a podcast episode with a specific deadline in mind. But we thought the z/OS 2.5 Preview announcement was something we could contribute to. So, here we are. I also wanted to talk about some Open Source projects I’ve been contributing to. So that’s inContinue reading “Mainframe Performance Topics Podcast Episode 28 “The Preview That We Do Anew””

SMF 70-1 – Where Some More Of The Wild Things Are

(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”