IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE27

PARTNER PERSPECTIVE
((( SPONSORED AVER TISING CONTENT )))

STOP THROTTLING THAT
FERRARI: GET BETTER GAS

JOHN BAKER
z Performance Specialist
MVS Solutions

John has been analyzing and
tuning MVS systems for over
20 years. He never trusts a
computer he can lift.

MVS Solutions Inc.
ThruPut Manager
#400 - 8300 Woodbine Ave.
Markham, ON, L3R 9Y7, Canada
(905) 940-9404
marketing@thruputmanager.com
thruputmanager.com

Today, we seem to be reaching the upper limits of CPU power in terms of raw clock speed.
The latest IBM z Systems* machine (z13*) has a lower clock speed than its predecessor,
the EC12*-yet the z13 achieves a 12 percent average improvement in total capacity
according to the Large System Performance Reference (LSPR). How is this possible?
The primary capacity bottleneck today is not in the capability of the CPU to execute
instructions; it's in the capability of the supporting infrastructure to keep the CPU
supplied with a steady stream of data and instructions to process. This critical task
falls to the CPU caches.
All modern CPU designs make use of multilevel caches in order to achieve this important
goal. In the z13, the small but fast L1 and L2 caches are dedicated to each CPU core.
Further out, there are larger L3, L4, and main memory caches that are shared among
CPUs. In IBM z Systems architecture, these shared cache areas are referred to as the nest.
The z13 CPUs "spin" at a rate of 5 GHz-5 billion cycles per second. In traditional
capacity planning terms, this could be referred to as 5,000 MIPS. However, your actual
achieved MIPS rate largely depends on how many cycles are wasted waiting for data
or instructions to be fetched from the processor caches. You likely only need a few
cycles to fetch from the local L1 or L2 caches. The deeper and more often you need
to go into the nest, the greater the cost in lost cycles. This measurement is known as
Relative Nest Intensity (RNI).
How do you optimize access to processor caches? Many factors are simply beyond
practical controls, however actions can be taken:
* Study your SMF 113 records to understand your processor cache efficiency
* Limit processor sharing among LPARs by setting PR/SM weights carefully and
balancing logical and physical CPUs; in a Hiperdispatch context, try to avoid
"Vertical Low" polarized CPs
* Reuse data in caches by minimizing the number of diverse applications and limit
concurrency in LPARs (automate batch initiators and CICS*/IMS* regions)
* Automate input queues to control CPU utilization (to avoid processor overload)
It's not about the engine; it's about the fuel. If you're not keeping the engine well
fed, you're just spinning your wheels.

ibmsystemsmag.com/buyersguide 2017 // 27

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http://www.thruputmanager.com https://www.linkedin.com/company/mvs-solutions-inc. https://www.youtube.com/channel/UCBm3mWiuRwL0ChTKQMxevbg http://www.ibmsystemsmag.com/buyersguide

IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition

Editor's Letter
Featured Products
Application Development
Business Intelligence/Analytics
Business Management
Communications and Connectivity
Database
Education
HA/DR/Backup
Hardware
Linux on z Systems
Mobile
Office Automation and Office Support
Performance
Security
Services/Consulting
Software Vertical Markets
Systems Management
Tools and Utilities
Web Development and Enablement
Business Necessities
Accessing Innovation
Constant Improvement
Secure From the Metal On Up
Handling Complexity
CM First Group: Application Development
DataKinetics: Database
MVS Solutions: Performance
Black Hill Software: Tools & Utilities
Compuware Corp.: Tools & Utilities
Product Index
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE1
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE2
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE3
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE4
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE5
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Editor's Letter
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Featured Products
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - CM First Group: Application Development
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Application Development
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE10
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE11
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE12
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE13
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Business Necessities
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Business Intelligence/Analytics
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Business Management
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Communications and Connectivity
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - DataKinetics: Database
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Education
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - HA/DR/Backup
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE21
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE22
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Hardware
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Accessing Innovation
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Office Automation and Office Support
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Constant Improvement
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - MVS Solutions: Performance
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Performance
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE29
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE30
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE31
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Secure From the Metal On Up
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Security
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE34
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE35
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE36
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE37
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE38
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE39
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE40
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE41
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Services/Consulting
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Software Vertical Markets
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE44
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Systems Management
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Handling Complexity
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE47
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Black Hill Software: Tools & Utilities
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Compuware Corp.: Tools & Utilities
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Tools and Utilities
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE51
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Web Development and Enablement
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - Product Index
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE54
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE55
IBM Systems Magazine, Mainframe - January/February 2017 Solutions Edition - SE56
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