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Analysing A WLM Policy - Part 2
This is the second part, following on from
Part 1 . Importance Versus Velocity After drawing out the hierarchy you have to set actual goals - whether velocity or some form of response time.
And you have to set importances. The importances should now be easy as they flow from the hierarchy.
IRLM should be in SYSSTC - which serves as an anchor at the top.
It’s not quite as simple, though,... [More]
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Analysing A WLM Policy - Part 1
This post started out with the title “Insufficient Nosiness?” I think most of mine do. And if they do they should be subtitled “What You Don’t Know Can Still Harm You”. Since then its scope’s expanded somewhat and now it’s in two parts, the second part being here . A lot of things have come together recently… I’ve just been involved in a... [More]
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How Many Eggs In Which Baskets?
You wouldn’t put all your eggs in one basket, CICSwise, would you?
A naive reading of the CICS TS 5.1 announcement materials might lead you to suppose you could .
This post is about thinking about your CICS region portfolio in the light of this announcement. While every CICS release introduces capabilities that makes it worthwhile to review your region portfolio,
5.1 majors on... [More]
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Are You Being Served?
As you will’ve seen in
WLM Response Time Distribution Reporting With RMF I’ve been thinking about WLM Response Time goals quite a bit recently.
And this post continues the train of thought. It’s very easy to think of WLM Service Classes as being self contained.
For many that’s true - and only their own performance numbers need to be considered for us to understand their... [More]
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WLM Response Time Distribution Reporting With RMF
If you’re running a workload with WLM Percentile Response Time goals
take a look at the RMF Service Class Period Response Time Goal Attainment instrumentation.
It’s in the Workload Activity Report but this post is about using the raw data to tell the
story better than a single snapshot (or long-term “munging”) can. (An example of a percentile response time goal is “90% of transactions must end... [More]
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Alternate Macro Libraries - Part 2
First, I’m indebted to Ray Mullins for his help in figuring out how to solve the problems I identified as remaining in Alternate Macro Libraries: A Way To Document Assembler Tables .
Indeed he wrote a very handy blog post of his own:
Wrapping your own macro code around vendor-supplied macros without changing source
This post, to summarise, shows how you can use the OPSYN instruction to create... [More]
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Testing Is Trying
It’s hard to write about test environments without feeling you’re insulting somebody.
That’s certainly true when it comes to performance tests. But I think that very fact is indicative of something:
It’s incredibly difficult to get it right.
Put another way, most environments are compromises. In recent weeks I’ve seen a number of customer situations where things... [More]
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Cloning Fan-In
Suppose you have a set of numbers S over which you define a function f.
Further suppose you partition S into S 1 and S 2 .
I’d like to know what function g is such that g({f(S 1 ),f(S 2 )}) = f(S). As much to the point I’d like to understand which functions f even have a corresponding function
g that meets the condition. Whoa! Was that pretentious enough for you? Let me start again… When I’ve... [More]
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Alternate Macro Libraries: A Way To Document Assembler Tables
I’m sharing this technique in case it’s useful to you.
And, selfishly, in case you can think of refinements. (I’m not the best assembler programmer in the world so could easily be missing a trick or two.) We map SMF records using a set of assembler macros - to create what are called log tables .
We summarise these log tables into summary tables , again defined using assembler... [More]
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Appening 2 - Broken Sword Director's Cut on iOS
Another week, another app.
This time it’s a game - and therefore a good excuse to (perhaps gratuitously) try out the
iPhone’s screenshot capability. (In case you don’t know, you press the power button and the home button simultaneously.
If you do you get a nice camera-like click and the screenshot goes to your camera roll.
In this instance I copied them to DropBox as the easiest way to get... [More]
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