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My Considered Opinion?
If you’re looking for a considered opinion you came to the wrong place . Or so anyone reading
Down In The Dumps? shortly after reading
Enigma And Variations Of A Memory Kind might conclude. It’s possibly a fair cop, possibly not, but it got me thinking… In reality life is a sequence of experiences, many of which we hopefully learn something from.
But it’s a journey of... [More]
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Down In The Dumps?
That’s such a horrible pun I must’ve used it before.
If so sorry (but not very). This post follows on from
Enigma And Variations Of A Memory Kind in a way.
In that post I mentioned DUMPSRV, in almost a throwaway fashion:
I happened to notice the memory usage in SMF 30 by DUMPSRV grew at just the point free memory took a dip. This post takes that idea and extends it a little - and... [More]
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What I'm Looking Forward To In z/OS 2.1
As I mentioned in
We Have Residents! we'll be working with a z/OS 2.1 system in October.
In fact I've already logged on to it.
I might even get to play with it before the residency starts, depending on current workload - but the priority is to hit the ground running by ensuring the environment is set up to our liking and that we have test data.
(And then there are those day-to-day... [More]
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Enigma And Variations Of A Memory Kind
This post, unlike the previous one, is “on topic” for a Mainframe Performance Topics blog.
I hope nobody’s relying on that.
In fact I joke about renaming blog this to “Mainframe, Performance, Topics” the next time I ask for the header to be updated.
In fact I just might. I recently got some data from a customer that I thought showed a bug in my code. Instead it... [More]
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Coupling Facility Duplexing Reporting Warm-Over
In my experience Coupling Facility Duplexing configuration and performance is something that tends to get neglected - once the initial configuration decisions have been made.
After all it’s rare that customers rework their Duplexing design. Over the past few weeks I’ve been comprehensively reworking my Coupling Facility tabular reporting, as I recently mentioned in
Coupling Facility... [More]
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The Missing Link?
Recently I wrote up some initial results of using OA37826 data in Coupling Facility Topology Information - A Continuing Journey . That post in turn followed on from
System zEC12 CFLEVEL 18 RMF Instrumentation Improvements . Since then an interesting thing happened - and sooner than I thought it would:
I got some data with a broken piece of Coupling Facility (CF) link infrastructure.
Lest you... [More]
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We Have Residents!
Back in May I wrote about a new batch residency planned for this October and invited good people to apply to join the team. It's been very pleasing how many people applied to be residents and the high quality of the entrants: It was genuinely difficult to pick the eventual team. We also had to reduce the scope a bit - which was a disappointment to both Frank Kyne and I. So, if you didn't get... [More]
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Sorting In REXX Made Easy
In REXX sorting is a fraught exercise - and you tend to have to resort to other programs to do it: DFSORT for the “heavy lifting” UNIX Sort but you might decide your sort is low volume enough to do in REXX.
The trouble is it’s difficult to write a routine that isn’t specific on how the data is sorted,
or rather how two items are compared - as we shall see. Following on... [More]
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Min And Max Of Tokens In A String
A couple of days ago I had a need to take a REXX string comprising space-separated numbers and find their minimum and maximum values. Here's the technique I used. (When I say "space-separated" there can be one or more spaces between the numbers, but there has to be at least one.) The solution has three components: The REXX SPACE function - to turn the list into a comma-separated string of... [More]
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Coupling Facility Topology Information - A Continuing Journey
9 months on from
this post and I finally get some time to enhance my Coupling Facility reporting. If you recall I mentioned
OA37826 , which provides new SMF 74 Subtype 4 data and fields in the RMF Coupling Facility Activity report - in support of enhancements in CFLEVEL 18. [1] I also mentioned that my 74–4 code needed reworking to properly support the Remote Coupling Facility Section... [More]
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