This is the first blog post I’ve written on my new work MacBook Pro. While it’s been a lot of work moving over it’s a better place as it’s an Apple Silicon M1 Max machine with lots of memory and disk space. That’s nice, but what’s the relevance to podcasting? Well, it’s very warm hereContinue reading “Mainframe Performance Topics Podcast Episode 31 “Take It To The Macs””
Tag Archives: performance
WLM-Managed Initiators And zIIP
One item in the z/OS 2.5 announcement caught my eye. Now 2.5 is becoming more prevalent it’s worth talking about it. It is zIIP and WLM-Managed Initiators. WLM-Managed Initiators The purpose of WLM-Managed Initiators is to balance system conditions against batch job initiation needs: Start too many initiators and you can cause CPU thrashing. StartContinue reading “WLM-Managed Initiators And zIIP”
SRB And Shutdown
I’ve written several times about System Recovery Boost (SRB) so I’ll try to make this one a quick one. For reference, previous posts were: Really Starting Something SRB And SMF Third Time’s The Charm For SRB – Or Is it? From that last one’s title it clearly wasn’t (the end of the matter). It’s worthContinue reading “SRB And Shutdown”
Engineering – Part Six – Defined Capacity Capping Considered Harmful?
For quite a while now I’ve been able to do useful CPU analysis down at the individual logical processor level. In fact this post follows on from Engineering – Part Five – z14 IOPs – at a discreet distance. I can’t believe I haven’t written about Defined Capacity Capping before – but apparently I haven’t.Continue reading “Engineering – Part Six – Defined Capacity Capping Considered Harmful?”
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”
Mainframe, Performance, Topics 