IBM Systems Magazine, Mainframe - September 2014 - 49

CICS/DB2 workload analysis
focused both on latch granularity
and on avoiding holding some
latches. In addition, optimizations
were made to avoid unnecessary
hardware data cache thrashing,
through better cache boundary
alignment, avoiding mixing data
and instructions in the same
cache lines, and improvements
made to reduce dispatcher delays
such as work unit switching.
Similarly, the main issue within
the IMS workload was internal
z/OS cross-memory address
space locks (CML). Time spent
waiting for these locks originally
caused the 80-way measurement
ITR point to be less than that at
64-way. Figure 1 (page 48) shows
an example of the classic n-way
bend that can occur at higher
values of n, in this case, after
64 processors. This represented
the initial starting point for this
workload in the scaling effort.
The CML lock fixes, as is the case
for n-way related improvements,
tended to have more value the
larger the n-way.
The WebSphere Application
Server/CICS/DB2 workload was
another instance where lock
contention caused a lack of
performance improvement as more
processors were added. In this case,
severe OS spin lock contention
caused most of the performance
trail-off as we approached 64-way.

The CICS/WebSphere MQ/
IMS/DB2 workload scalability
was primarily improved via
environmental tuning, though we
experienced some serialization
issues as we scaled up. Initially,
scaling was poor, flattening out
around 32-way.
Some tuning and configuration
changes that helped overall
scaling were:

A partnership between
SHARE and IBM Systems
Magazine, Mainframe
edition with support
from IBM.
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R E P O R T :

B I G

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A partnership between SHARE and IBM Systems Magazine, Mainframe edition with support from IBM.

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Scalability Supports
Growth

While outstanding scaling results
have been achieved already, it
should not be considered to be a
one-time event. As demand builds
for higher numbers of hardware
threads and newer workload
environments emerge it will be
important to continue to assure
that System z images scale well
and continue to provide good
performance. Single z/OS image
vertical scalability combined
with excellent Parallel Sysplex
horizontal scalability provides an
optimized, synergistic approach
you can use to support growing
workload environments.

ITR Defined
Internal Throughput Rate (ITR) is the number of transactions or
jobs per second as measured at 100 percent CPU utilization
(that is, the transaction rate divided by the CPU utilization).
For example, if the ITR at 16-way for a specific workload
were 100, and at 64-way it were 300, the scale efficiency
would be calculated by dividing 300 by 100, or 3. This is
then divided by the maximum possible scale efficiency
(SE) in this example, which would be 4, or linear scale.
The result would be 75 percent SE, 3 over 4.

Competitive Advantage
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IBM Systems Magazine, Mainframe - September 2014

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - September 2014

Table of Contents
Editor's Desk: Moving in the mobile world
IBM Perspective: Mobile money thanks to the mainframe
Partner PoV: A clean IT audit does not guarantee network or computer security
Focus on Storage: How Elastic Storage helps remove bottlenecks and lower costs
Currents: IBM Smarter Storage puts businesses in control of their data
Trends: Choosing the best proprietary or open-source applications
Case Study: Cooperative Consolidation: The Credit Union System of Brazil saves millions of dollars by virtualizing on the mainframe
Cover Story: The Mobile Mainframe: System z is a perfect fit for the growing trend
Feature: Connecting Applications and Data: WebSphere Liberty z/OS Connect makes business assets accessible to mobile devices
Tech Showcase: How Linux on System z has become a go-to solution for businesses
Administrator: IBM tests show finding the optimal number of n-way processors helps maximize performance
Tech Corner: The new z/OSMF Workflows feature optimizes programming tasks
Solutions: OMC-FLASH 4.7.0; z86VM; Storage Director 4.2
Stop Run: IBMer's passion for engineering puts his house to work
Reference Point - Global Events, Education, Resources for Mainframe
2015 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - September 2014 - Intro
IBM Systems Magazine, Mainframe - September 2014 - Cover1
IBM Systems Magazine, Mainframe - September 2014 - Cover2
IBM Systems Magazine, Mainframe - September 2014 - 1
IBM Systems Magazine, Mainframe - September 2014 - Table of Contents
IBM Systems Magazine, Mainframe - September 2014 - 3
IBM Systems Magazine, Mainframe - September 2014 - 4
IBM Systems Magazine, Mainframe - September 2014 - 5
IBM Systems Magazine, Mainframe - September 2014 - Editor's Desk: Moving in the mobile world
IBM Systems Magazine, Mainframe - September 2014 - 7
IBM Systems Magazine, Mainframe - September 2014 - IBM Perspective: Mobile money thanks to the mainframe
IBM Systems Magazine, Mainframe - September 2014 - 9
IBM Systems Magazine, Mainframe - September 2014 - Partner PoV: A clean IT audit does not guarantee network or computer security
IBM Systems Magazine, Mainframe - September 2014 - 11
IBM Systems Magazine, Mainframe - September 2014 - 12
IBM Systems Magazine, Mainframe - September 2014 - 13
IBM Systems Magazine, Mainframe - September 2014 - Focus on Storage: How Elastic Storage helps remove bottlenecks and lower costs
IBM Systems Magazine, Mainframe - September 2014 - 15
IBM Systems Magazine, Mainframe - September 2014 - 16
IBM Systems Magazine, Mainframe - September 2014 - 17
IBM Systems Magazine, Mainframe - September 2014 - Currents: IBM Smarter Storage puts businesses in control of their data
IBM Systems Magazine, Mainframe - September 2014 - 19
IBM Systems Magazine, Mainframe - September 2014 - 20
IBM Systems Magazine, Mainframe - September 2014 - Trends: Choosing the best proprietary or open-source applications
IBM Systems Magazine, Mainframe - September 2014 - 22
IBM Systems Magazine, Mainframe - September 2014 - 23
IBM Systems Magazine, Mainframe - September 2014 - Case Study: Cooperative Consolidation: The Credit Union System of Brazil saves millions of dollars by virtualizing on the mainframe
IBM Systems Magazine, Mainframe - September 2014 - 25
IBM Systems Magazine, Mainframe - September 2014 - 26
IBM Systems Magazine, Mainframe - September 2014 - 27
IBM Systems Magazine, Mainframe - September 2014 - Cover Story: The Mobile Mainframe: System z is a perfect fit for the growing trend
IBM Systems Magazine, Mainframe - September 2014 - 29
IBM Systems Magazine, Mainframe - September 2014 - 30
IBM Systems Magazine, Mainframe - September 2014 - 31
IBM Systems Magazine, Mainframe - September 2014 - 32
IBM Systems Magazine, Mainframe - September 2014 - 33
IBM Systems Magazine, Mainframe - September 2014 - Feature: Connecting Applications and Data: WebSphere Liberty z/OS Connect makes business assets accessible to mobile devices
IBM Systems Magazine, Mainframe - September 2014 - 35
IBM Systems Magazine, Mainframe - September 2014 - 36
IBM Systems Magazine, Mainframe - September 2014 - 37
IBM Systems Magazine, Mainframe - September 2014 - 38
IBM Systems Magazine, Mainframe - September 2014 - Tech Showcase: How Linux on System z has become a go-to solution for businesses
IBM Systems Magazine, Mainframe - September 2014 - 40
IBM Systems Magazine, Mainframe - September 2014 - 41
IBM Systems Magazine, Mainframe - September 2014 - 42
IBM Systems Magazine, Mainframe - September 2014 - 43
IBM Systems Magazine, Mainframe - September 2014 - 44
IBM Systems Magazine, Mainframe - September 2014 - 45
IBM Systems Magazine, Mainframe - September 2014 - Administrator: IBM tests show finding the optimal number of n-way processors helps maximize performance
IBM Systems Magazine, Mainframe - September 2014 - 47
IBM Systems Magazine, Mainframe - September 2014 - 48
IBM Systems Magazine, Mainframe - September 2014 - 49
IBM Systems Magazine, Mainframe - September 2014 - Tech Corner: The new z/OSMF Workflows feature optimizes programming tasks
IBM Systems Magazine, Mainframe - September 2014 - 51
IBM Systems Magazine, Mainframe - September 2014 - 52
IBM Systems Magazine, Mainframe - September 2014 - 53
IBM Systems Magazine, Mainframe - September 2014 - Solutions: OMC-FLASH 4.7.0; z86VM; Storage Director 4.2
IBM Systems Magazine, Mainframe - September 2014 - 55
IBM Systems Magazine, Mainframe - September 2014 - Stop Run: IBMer's passion for engineering puts his house to work
IBM Systems Magazine, Mainframe - September 2014 - Cover3
IBM Systems Magazine, Mainframe - September 2014 - Cover4
IBM Systems Magazine, Mainframe - September 2014 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - September 2014 - RF2
IBM Systems Magazine, Mainframe - September 2014 - 2015 Mainframe Solutions Edition
IBM Systems Magazine, Mainframe - September 2014 - SE2
IBM Systems Magazine, Mainframe - September 2014 - SE3
IBM Systems Magazine, Mainframe - September 2014 - SE4
IBM Systems Magazine, Mainframe - September 2014 - SE5
IBM Systems Magazine, Mainframe - September 2014 - SE6
IBM Systems Magazine, Mainframe - September 2014 - SE7
IBM Systems Magazine, Mainframe - September 2014 - SE8
IBM Systems Magazine, Mainframe - September 2014 - SE9
IBM Systems Magazine, Mainframe - September 2014 - SE10
IBM Systems Magazine, Mainframe - September 2014 - SE11
IBM Systems Magazine, Mainframe - September 2014 - SE12
IBM Systems Magazine, Mainframe - September 2014 - SE13
IBM Systems Magazine, Mainframe - September 2014 - SE14
IBM Systems Magazine, Mainframe - September 2014 - SE15
IBM Systems Magazine, Mainframe - September 2014 - SE16
IBM Systems Magazine, Mainframe - September 2014 - SE17
IBM Systems Magazine, Mainframe - September 2014 - SE18
IBM Systems Magazine, Mainframe - September 2014 - SE19
IBM Systems Magazine, Mainframe - September 2014 - SE20
IBM Systems Magazine, Mainframe - September 2014 - SE21
IBM Systems Magazine, Mainframe - September 2014 - SE22
IBM Systems Magazine, Mainframe - September 2014 - SE23
IBM Systems Magazine, Mainframe - September 2014 - SE24
IBM Systems Magazine, Mainframe - September 2014 - SE25
IBM Systems Magazine, Mainframe - September 2014 - SE26
IBM Systems Magazine, Mainframe - September 2014 - SE27
IBM Systems Magazine, Mainframe - September 2014 - SE28
IBM Systems Magazine, Mainframe - September 2014 - SE29
IBM Systems Magazine, Mainframe - September 2014 - SE30
IBM Systems Magazine, Mainframe - September 2014 - SE31
IBM Systems Magazine, Mainframe - September 2014 - SE32
IBM Systems Magazine, Mainframe - September 2014 - SE33
IBM Systems Magazine, Mainframe - September 2014 - SE34
IBM Systems Magazine, Mainframe - September 2014 - SE35
IBM Systems Magazine, Mainframe - September 2014 - SE36
IBM Systems Magazine, Mainframe - September 2014 - SE37
IBM Systems Magazine, Mainframe - September 2014 - SE38
IBM Systems Magazine, Mainframe - September 2014 - SE39
IBM Systems Magazine, Mainframe - September 2014 - SE40
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