IBM Systems Magazine, Mainframe - September 2014 - 46

ADMINISTRATOR

Improve SCALABILITY
of Hardware Threads
IBM tests show finding the optimal number of n-way processors helps
maximize performance

T

he view of system behavior for z/OS* symmetric multiprocessing with a large
number of processors (n-way) has changed substantially. Traditional views of
system performance at high n-way are outdated.

Mark
Wisniewski is a
senior
technical staff
member for the
System z
platform. He has
spent his entire
career at IBM
working on
systems
performance.

At IBM, we have done some
recent work to dramatically
improve the scalability of some
key internal System z* workloads
using a number of middleware
products on z/OS. While
Parallel Sysplex*, with its datasharing capabilities, remains a
vital z/OS environment, the focus
for this work was single-system
z/OS image scaling with a large
number of processors in one
LPAR.

Number of n-way
Processors Matters

It has always been a challenge
to ensure software components
can efficiently exploit large
numbers of hardware execution
threads or processors within a
single OS image. We have been
working for decades to improve
how well systems scale to achieve
acceptable performance as more
processors are added to a single
system image.
46 // SEPTEMBER/OCTOBER 2014 ibmsystemsmag.com

Depending on a variety
of systems constraints and
performance issues that arise,
the performance gain realized
from adding each additional
processor can quickly approach
zero or, even worse, go
negative.
The key to understanding how
the OS and related middleware
products will behave as the
number of processors in a single
system image grows is the shape
of the n-way curve.
We must scale up the desired
workload environments to
sufficiently high n-way values
to stress various system
components across the OS,
middleware and hardware;
instrument these components
using hardware and software
performance monitors to provide
insights into bottlenecks that
may be arising; and prototype
and make product improvements
available to address these issues.

Several aspects of large systems
stack performance and scale bear
on this discussion including:
ĀÃ +DUGZDUHÃWKUHDGÃVSHHGÃZKLFKÃ
can be driven by hardware
technology and software code
optimization
ĀÃ 0HPRU\ÃVFDODELOLW\ÃZKHUHÃ
software can play a big role
by removing large memory
exploitation inhibitors
ĀÃ 3DUDOOHOÃ6\VSOH[ÃZKHUHÃ
software can allow for
horizontal growth by removing
inhibitors and constraints
ĀÃ +DUGZDUHÃWKUHDGOHYHOÃ
parallelism, enabled by
multiple cores or processors,
large system software
constraints removal, and n-way
scalability of the operating
system and middleware
This last point, of scaling large
numbers of parallel hardware
threads, is this article's focus.


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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
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IBM Systems Magazine, Mainframe - September 2014 - SE35
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IBM Systems Magazine, Mainframe - September 2014 - SE37
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IBM Systems Magazine, Mainframe - September 2014 - SE40
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