performance – Mainframe, Performance, Topics

Mainframe Performance Topics Podcast Episode 30 “Choices Choices”

It’s been a mighty long time since Marna and I got a podcast episode out – and actually we started planning this episode long ago. It’s finding good times to record that does it to us, as planning can be a bit more asynchronous. Hopefully this delay has enabled some of you to catch upContinue reading “Mainframe Performance Topics Podcast Episode 30 “Choices Choices””

Third Time’s The Charm For SRB – Or Is it?

Passing reference to Blondes Have More Fun – Or Do They?. Yeah, I know, it’s a tortuous link. 🙂 And, nah, I never did own that album. 🙂 I first wrote about System Recovery Boost (SRB) and Recovery Process Boost (RPB) in SRB And SMF. Let me quote one passage from it: It should alsoContinue reading “Third Time’s The Charm For SRB – Or Is it?”

Really Starting Something

This post is about gleaning start and stop information from SMF – which, to some extent, is not a conventional purpose. But why do we care about when IPLs happen? Likewise middleware starts and stops? Or any other starts and stops? I think, if you’ll pardon the pun, we should stop and think about this.Continue reading “Really Starting Something”

SRB And SMF

I’ve just had my first brush with SMF from z15’s System Recovery Boost (SRB). (Don’t blame me for the reuse of “SRB”.) 🙂 The point of this post is to share what I’ve discerned when processing this SMF data. System Recovery Boost To keep the explanation of what it is short, I’ll say there areContinue reading “SRB And SMF”

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”