Mainframe Performance Topics with Martin Packer

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Oh The Arrogance Of It

MartinPacker Comments (2) Visits (5570)

One of my new 2016 presentations is called “How To Be A Better Performance Specialist” - though I really could use a snappier title. Here’s the abstract: I’ve spent 30 years doing Performance and Capacity. You’d think it’d seem stale and repetitive by now. Not a bit of it. It’s still fresh and interesting. More to the point I think I’m... [More]

Suffering Subsystems

MartinPacker Visits (5341)

I wish I’d started counting DB2 subsystems before. A recent study saw 43 DB2 subsystems, in 13 Data Sharing groups (and a few in none), across a large number of z/OS systems. And if I try to remember other studies these numbers have been typical of them (but this is not a typical set of numbers). Two thoughts entered my head: How on earth do you get to these sorts of numbers, and is it a... [More]

DDF Batch

MartinPacker Visits (5740)

DDF and Batch sound like two opposite ends of the spectrum, don’t they? Well, it turns out they’re not. I said in DDF Counts I might well have more to say about DDF. I was right. I’ve known for a long time that some DDF work can come in from other z/OS DB2 subsystems, but not really thought much about it. Until now. And I don’t really know why now. Maybe it’s just... [More]

DDF Counts

MartinPacker Visits (5944)

I don’t think I’ve ever written very much about DDF. Now seems like a good time to start. I say this because I’ve been working pretty intensively over the last couple of weeks on upgrading our DDF Analysis code. Hence the recent DFSORT post ( DFSORT Tables ). I’m actually not the DB2 specialist in the team but, I’d claim, I know more about DB2 than many people who... [More]

DFSORT Tables

MartinPacker Comments (2) Visits (6033)

It’s been a while since I posted a DFSORT trick - and it’s high time I did. This post follows (distantly) on from More Maintainable DFSORT and is occasioned by some recent development work on our tools. As so often happens, developing this code has been a bit of a journey of discovery. And I’ve learnt (the hard way) a couple more ways you can make the code more maintainable.... [More]

Tis The Season

MartinPacker Visits (5281)

I can cope with both “zee” and “zed”. [1] I love the myriad ways of pronouncing “CICS”. I can even detect such things as “Day Bay Tway” when I hear them. But there are a couple of things that I’m slightly bemused by: People saying “zee-oss” or “zed-oss” or “zoss”. People calling WLM “Willem”. I... [More]

Overdoing It

MartinPacker Visits (5338)

WLM will give up on an unachievable goal, eventually. Recently I came across a customer who didn’t know this and for whom this was a big problem. [1] This customer, like many others, was running heavily constrained for CPU. [2] But it does have consequences. In this particular case they had defined two service classes - one for their main Production IMS address spaces and one for their... [More]

WLM Policy Timestamp Analysis

MartinPacker Visits (5115)

After writing Reviewing The Situation I got thinking. [1] I’ve known for a long time the WLM Policy (XML) has timestamps in it. The thought was “maybe there’s value in doing timestamp analysis”. Here is a fragment of a real customer policy, showing a resource group definition: It’s pretty easy to read. Obviously the XML elements whose node name start with... [More]

Reviewing The Situation

MartinPacker Visits (3924)

I might have written about this before but it’s such a nebulous subject Web searches don’t enable me to tell. In any case it’s a subject worth reviewing every now and then. The subject is “when to review your WLM policy”. I’ve written extensively on how to look at a policy. While I think you should read Analysing A WLM Policy - Part 1 I want to refer to... [More]

Thanks In Five Languages - ITSO 2015 Tour

MartinPacker Visits (4692)

I’ve been very lucky (and kept busy and challenged) these last two months. In addition to my usual case load of customer situations I’ve had the enormous privilege of participating in the ITSO 2015 Mainframe Topics tour. I’ve presented whole-day sessions on Performance and Availability in five cities: Amsterdam, Paris, Warsaw, Vienna and Bromsgrove. [1] The main topics have... [More]

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