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All posts
It Doesn't Take Much To Confuse Me
... with a Performance Consultant? :-) Seriously, here's something that made me go "hmm"... I started looking at the latest set of data from a customer... Their biggest-CPU WLM workload is called "BATCH" when they told me they were a CICS shop - and that CICS was their main CPU consumer during the day. But it turns out that the biggest service class within that workload contains exclusively CICS... [More]
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IMS Version 10 Memory Enhancements
Regular readers would know I'm working on my "Memory Matters in 2008" presentation, which is a re-spin of the '07 Version. One of the things I talk about is IMS. Thanks to my team mate Andy Wilkinson for this list of IMS Version 10 enhancements, all of which are virtual storage usage improvements. Here are the more important items: OTMA message flood protection (prevents LSQA filling). This is... [More]
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UK GSE Conference 30-31 October - Memory Matters in 2008
One of the problems with having a presentation with a topical title is that you keep having to update the darned thing. :-) "Memory Matters in 2007" is a case in point. It's morphed over the years from two presentations: "Central Storage Performance" and "Expanded Storage Performance" (the latter of which eventually became obsolete) to a presentation that covered OS/390 real memory, DFSORT and DB2... [More]
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Humble Pie Regarding DFSORT and SMF
(Also posted to MXG-L Listserver (MXG-L@PEACH.EASE.LSOFT.COM) which I highly recommend as a place where mainframe performance people hang out.) I must confess I feel slightly foolish about this... :-) After having asked for input into my UKCMG BOF one of the themes that came out was better ways of doing what IFASMFDP does. (I already have this on my agenda - as you'll know if you follow my blog.)... [More]
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Madness At Passport Control
I happened to be travelling through Heathrow Terminal 2 yesterday and the day before. Two incidents that made me scratch my head, both related to Passport Control... On the way out there are two Passport Control desks, just past Security. They are set a few feet apart and people can go either side of either of them. For once there was someone on duty, but only one officer. At the head of the queue... [More]
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Birds Of A Feather Session at UKCMG Conference, June 25-27
As you probably know this year's UKCMG conferenece in June 25-27, Whittlebury Hall, Northants. I noticed when I read the agenda yesterday 2 things: Glenn Anderson's being worked awfully hard . He's a great speaker so do make the effort to attend his sessions. There's a BOF session on each evening - just before the entertainment. So I rang Laura at UKCMG up and offered to run a BOF. I got a "that's... [More]
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XCF Performance WSC White Paper
I'm reminded of this white paper on XCF Performance from Joan Kelley and Kathy Walsh. It's a good read and has been recently updated. It does also remind me that there are "D XCF" subcommands that give information that isn't in the RMF data (SMF 74 Subtype 2). We process these records in our consulting and I'm getting considerably more familiar the underlying data. (I also had a situation recently... [More]
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Big Green
Now I know why, as previously reported here, there's a new power meter on the HMC. See this blog entry and the links from it for more details of the "Big Green" energy efficiency initiative. And this goes way beyond the "packets of grass seed" campaign of last year - which highlighted the already available energy-saving characteristics of the mainframe.
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As Seen on Nürnberg U-Bahn
Here's a nice BSOD from a ticket machine on the Nürnberg U-Bahn. :-)
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When Good Work Doesn't Go To zIIP / zAAP Heaven
Whenever I talk about zIIPs and zAAPs I'm reminded of Zip Zap miniature radio-controlled cars . But (to get past the censors I have to say) zIIPs and zAAPs are not toys. Here's an extract from a post on MXG-L that Bernie Pierce made. (I reproduce it with his kind permission.) If there is contention for the local lock, the cross memory local lock, the CMS lock or any other suspend lock, units of... [More]
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