IBM Systems Magazine, Mainframe Edition - November/December 2012 - 8

Insider

Insights from the industry

What’s Really Driving Peak CPU Usage?
In many cases, batch processing accounts for as much as 40 percent
By Martin Wills

During my tenure with MVS Solutions, I often asked customers what they thought drove their usage peaks. Typically, they’d say the peaks were entirely dependent on online processing. However, I’ve long suspected that batch processing also plays a significant role. So I decided to see if my suspicions were justified. Some colleagues and I devised a way to analyze monthly usage and calculate both the overall four-hour rolling average and the four-hour rolling average for batch. The results among the participants in our study indicated that batch processing accounted for a surprising 30 to 40 percent of the peaks in many cases. That’s a significant contributor to usage and ultimately results in increased costs.

M

any installations using some form of subcapacity pricing believe their peak CPU usage is driven by their online workload. But is that really true?
At the Source Instantaneous spikes in usage, however, aren’t really the issue, other than the fact they drive the four-hour rolling average higher. Peaks on a given LPAR aren’t usually the problem either, because most costs are based on the highest four-hour average usage of the month on each physical machine or central electronic complex (CEC). Of course, all LPARs contribute to this average, so any approach to controlling your peaks has to take this into account. To help control four-hour rolling averages, IBM provides a mechanism, known as soft capping, in which you can specify a limit for the four-hour rolling average. All workloads running on the CEC are affected to some degree when capping causes usage to be

8

NOVEMBER/DECEMBER 2012

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IBM Systems Magazine, Mainframe Edition - November/December 2012

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe Edition - November/December 2012

IBM Systems Magazine, Mainframe Edition - November/December 2012
Table of Contents
Editor's Desk: Been There, Done That
IBM Perspective: Not All Clouds Are Designed Equal
Insider: What's Really Driving Peak CPU Usage?
Focus on Storage: The DS8870 Provides up to Three Times the Performance of Its Predecessor
Case Study: A Capital Investment: DTCC implements tools to ensure its networking infrastructure is ready for anything
Cover Story: A Clear Vision for Cloud: System z GM Doug Balog on why zEnterprise provides a firm foundation for a secure cloud
Feature: Overcoming Cloud Obstacles: The benefits far outweigh the challenges associated with cloud integration
Tech Corner: From Silicon to Architecture, zEC12 Innovations Push the Envelope
Administrator: IBM zAware Extends z/OS Resilience to Another Level
Solutions: Attach Facility; DataSniff; AutoPilot; Eclipse; Correlog Enterprise Server 5.1
Advertisers Index
Stop Run: IBM Distinguished Engineer Joe Temple Reflects on His Juggling Past
Reference Point - Global Events, Education, Resources for Power Systems
Smarter Computing
2013 Mainframe Buyer's Guide Index
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Intro
IBM Systems Magazine, Mainframe Edition - November/December 2012 - IBM Systems Magazine, Mainframe Edition - November/December 2012
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Table of Contents
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 5
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Editor's Desk: Been There, Done That
IBM Systems Magazine, Mainframe Edition - November/December 2012 - IBM Perspective: Not All Clouds Are Designed Equal
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Insider: What's Really Driving Peak CPU Usage?
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BB1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BB2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 9
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 10
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Focus on Storage: The DS8870 Provides up to Three Times the Performance of Its Predecessor
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 12
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 13
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Case Study: A Capital Investment: DTCC implements tools to ensure its networking infrastructure is ready for anything
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 15
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 16
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 17
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 18
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 19
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover Story: A Clear Vision for Cloud: System z GM Doug Balog on why zEnterprise provides a firm foundation for a secure cloud
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 21
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 22
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 23
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 24
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 25
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Feature: Overcoming Cloud Obstacles: The benefits far outweigh the challenges associated with cloud integration
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 27
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 28
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 29
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Tech Corner: From Silicon to Architecture, zEC12 Innovations Push the Envelope
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 31
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 32
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 33
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Administrator: IBM zAware Extends z/OS Resilience to Another Level
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 35
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 36
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 37
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Solutions: Attach Facility; DataSniff; AutoPilot; Eclipse; Correlog Enterprise Server 5.1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Advertisers Index
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Stop Run: IBM Distinguished Engineer Joe Temple Reflects on His Juggling Past
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Cover4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Reference Point - Global Events, Education, Resources for Power Systems
IBM Systems Magazine, Mainframe Edition - November/December 2012 - RF2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - Smarter Computing
IBM Systems Magazine, Mainframe Edition - November/December 2012 - SC2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S1
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S5
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S6
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S7
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S8
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S9
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S10
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S11
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S12
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S13
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S14
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S15
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S16
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S17
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S18
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S19
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S20
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S21
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S22
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S23
IBM Systems Magazine, Mainframe Edition - November/December 2012 - S24
IBM Systems Magazine, Mainframe Edition - November/December 2012 - SC3
IBM Systems Magazine, Mainframe Edition - November/December 2012 - SC4
IBM Systems Magazine, Mainframe Edition - November/December 2012 - 2013 Mainframe Buyer's Guide Index
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BG2
IBM Systems Magazine, Mainframe Edition - November/December 2012 - BG3
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