IBM Systems magazine, IBM Z - May/June 2020 - SD25

ARTICLE

PERFORMANCE

Improving Application Performance
By Shirley S. Savage

A

pplication performance gets
short shrift primarily because
the effort to do it is considerable
and the tools and monitors aren't
easy to standardize. However, when
response time or job turnaround
time is less than acceptable, it's time
to look at application tuning, writes
technology expert Jim Schesvold.
The primary causes of
unacceptable application
performance are application design,
program language and programming
techniques. Application tuning can
improve performance and is less
costly than application rewrites.
Application tuning is a different
animal from software and
hardware tuning. Software tuning
parameters can be adjusted to
improve performance. Hardware
configurations can be altered.
How an application performs is
partially due to how many users
are on the system and how they are
using it. Discovering what issue
is creating the log jam and then
tuning the application can enhance
performance.
Schesvold suggests several steps to
identify the performance issue and
solve it. These are:
* Understand bottlenecks
and identify constraints. It's
important to find the cause,
location and nature of the
performance issue. Finding
a method to correct it may be
all that's needed to solve the
problem.
* Use customized, streamlined
subroutines to replace

*

*

*

*

programmer-written logic, to
boost performance and assist
with complex numeric functions.
Tune using callable services that
come with most programming
languages to find parameters
that impact program
performance. Previously
known as linkage editors,
these products have enhanced
language function and assist
with productivity.
Reduce program processing time
by minimizing I/O overhead and
read/write times. This tuning
is targeted at an application
experiencing performance
issues read/write times. This
often can be solved by boosting
buffer allocations in the
processor and disk controllers.
Application performance can
be affected by distributed
network performance. The
reduced response time is due
to transmission speed, error
rate and availability. The best
solution is to keep data and
processing together and create
a network with sufficient
bandwidth.
If the processor and application
are cycle constrained, then
adding processing power may be
the remedy. This should be the
last option as it is costly.

The best tuned, most efficient IT
system won't provide users with
excellent response times unless
applications programs are tuned and
maintained to emphasize function and
performance.

"To assume the application
programming staff's only
responsibility is to produce code
is a big mistake," Schesvold says.
"If the application once put into
production performs poorly and
prevents employees from performing
their job in a superior manner, the
application isn't providing value nor
is it enabling the people who work
with it ("Application Performance and
Tuning," bit.ly/2OLvWt5).

OTMA Keeps Mobile
Transactions Fast
Lightning speed is needed to process
large, complex mobile transactions.
Even a few extra seconds needed to
process the transaction can make a
consumer nervous.
Many mobile applications connect
with IMS* transactions using Open
Transaction Manager Access (OTMA).
Recent OTMA enhancements have
improved its agility and performance
to handle surging transaction
workloads.
OTMA now has a fast lane to handle
acknowledgement messages (ACK
or NAK) from clients including
IMS Connect and IBM MQSeries.
Processing these messages quickly is
important. An OTMA enhancement
allows these ACK or NAK messages
to be processed faster. OTMA also
has improved storage buffers with
optimize storage for OTMA CM0
and CM1 output messages. Other
enhancements include handling
of IMS callouts and enhanced
tpipe cleanup ("What's New in IMS
OTMA for Mobile Transactions," bit.
ly/2MfouEY).

ibmsystemsmag.com/solutions-directory 2020 25


http://bit.ly/2OLvWt5 http://bit.ly/2MfouEY http://bit.ly/2MfouEY http://www.ibmsystemsmag.com/solutions-directory

IBM Systems magazine, IBM Z - May/June 2020

Table of Contents for the Digital Edition of IBM Systems magazine, IBM Z - May/June 2020

Table of Contents
Editor's Desk: Enabling your success in a hybrid multicloud world
Currents: Arvind Krishna elected IBM CEO, James Whitehurst elected president
Currents: Solutions
Currents: Sustainable battery composition
Currents: The next generation of IBMers on why IBM Z is relevant
Currents: Women in IT value community and mentorship
Currents: A call to all Canadian mainframers
Partner POV: Develop an effective package management strategy to streamline DevOps
Cover Story: Meet the New IBM z15 and IBM LinuxONE III Models: The latest air-cooled systems can help enhance resiliency, security and availability in a hybrid cloud world
The Business Value of the Transformative IBM Z Platform How Feature 1: The Business Value of the Transformative IBM Z Platform: How IBM Z provides tools and capabilities for digital transformation
TECH Showcase: The IBM DS8900F family of flash storage systems provides improved encryption, disaster recovery, uptime and scalability
Techbits: Linux on IBM Z and IBM LinuxONE: When to use SCSI versus DASD storage
Techbits: Application tier considerations for moving to the cloud or x86
Techbits: Ask the expert: How can I reduce risk when performing an IBM Z hardware upgrade?
Beyond the Box: IBMer David Hilliard on his role as a locomotive engineer for the Catskill Mountain Railroad
IBM Systems magazine, IBM Z - May/June 2020 - Intro
IBM Systems magazine, IBM Z - May/June 2020 - Table of Contents
IBM Systems magazine, IBM Z - May/June 2020 - Cover2
IBM Systems magazine, IBM Z - May/June 2020 - 1
IBM Systems magazine, IBM Z - May/June 2020 - 2
IBM Systems magazine, IBM Z - May/June 2020 - 3
IBM Systems magazine, IBM Z - May/June 2020 - 4
IBM Systems magazine, IBM Z - May/June 2020 - 5
IBM Systems magazine, IBM Z - May/June 2020 - Editor's Desk: Enabling your success in a hybrid multicloud world
IBM Systems magazine, IBM Z - May/June 2020 - 7
IBM Systems magazine, IBM Z - May/June 2020 - Currents: Solutions
IBM Systems magazine, IBM Z - May/June 2020 - Currents: The next generation of IBMers on why IBM Z is relevant
IBM Systems magazine, IBM Z - May/June 2020 - Currents: Women in IT value community and mentorship
IBM Systems magazine, IBM Z - May/June 2020 - 11
IBM Systems magazine, IBM Z - May/June 2020 - 12
IBM Systems magazine, IBM Z - May/June 2020 - 13
IBM Systems magazine, IBM Z - May/June 2020 - Currents: A call to all Canadian mainframers
IBM Systems magazine, IBM Z - May/June 2020 - 15
IBM Systems magazine, IBM Z - May/June 2020 - Partner POV: Develop an effective package management strategy to streamline DevOps
IBM Systems magazine, IBM Z - May/June 2020 - 17
IBM Systems magazine, IBM Z - May/June 2020 - Cover Story: Meet the New IBM z15 and IBM LinuxONE III Models: The latest air-cooled systems can help enhance resiliency, security and availability in a hybrid cloud world
IBM Systems magazine, IBM Z - May/June 2020 - 19
IBM Systems magazine, IBM Z - May/June 2020 - 20
IBM Systems magazine, IBM Z - May/June 2020 - 21
IBM Systems magazine, IBM Z - May/June 2020 - 22
IBM Systems magazine, IBM Z - May/June 2020 - 23
IBM Systems magazine, IBM Z - May/June 2020 - The Business Value of the Transformative IBM Z Platform How Feature 1: The Business Value of the Transformative IBM Z Platform: How IBM Z provides tools and capabilities for digital transformation
IBM Systems magazine, IBM Z - May/June 2020 - 25
IBM Systems magazine, IBM Z - May/June 2020 - 26
IBM Systems magazine, IBM Z - May/June 2020 - 27
IBM Systems magazine, IBM Z - May/June 2020 - 28
IBM Systems magazine, IBM Z - May/June 2020 - TECH Showcase: The IBM DS8900F family of flash storage systems provides improved encryption, disaster recovery, uptime and scalability
IBM Systems magazine, IBM Z - May/June 2020 - 30
IBM Systems magazine, IBM Z - May/June 2020 - 31
IBM Systems magazine, IBM Z - May/June 2020 - 32
IBM Systems magazine, IBM Z - May/June 2020 - 33
IBM Systems magazine, IBM Z - May/June 2020 - 34
IBM Systems magazine, IBM Z - May/June 2020 - Techbits: Linux on IBM Z and IBM LinuxONE: When to use SCSI versus DASD storage
IBM Systems magazine, IBM Z - May/June 2020 - 36
IBM Systems magazine, IBM Z - May/June 2020 - Techbits: Application tier considerations for moving to the cloud or x86
IBM Systems magazine, IBM Z - May/June 2020 - 38
IBM Systems magazine, IBM Z - May/June 2020 - Techbits: Ask the expert: How can I reduce risk when performing an IBM Z hardware upgrade?
IBM Systems magazine, IBM Z - May/June 2020 - Beyond the Box: IBMer David Hilliard on his role as a locomotive engineer for the Catskill Mountain Railroad
IBM Systems magazine, IBM Z - May/June 2020 - Cover3
IBM Systems magazine, IBM Z - May/June 2020 - Cover4
IBM Systems magazine, IBM Z - May/June 2020 - SD
IBM Systems magazine, IBM Z - May/June 2020 - CoverSD1
IBM Systems magazine, IBM Z - May/June 2020 - CoverSD2
IBM Systems magazine, IBM Z - May/June 2020 - SD1
IBM Systems magazine, IBM Z - May/June 2020 - SD2
IBM Systems magazine, IBM Z - May/June 2020 - SD3
IBM Systems magazine, IBM Z - May/June 2020 - SD4
IBM Systems magazine, IBM Z - May/June 2020 - CT1
IBM Systems magazine, IBM Z - May/June 2020 - CT2
IBM Systems magazine, IBM Z - May/June 2020 - SD5
IBM Systems magazine, IBM Z - May/June 2020 - SD6
IBM Systems magazine, IBM Z - May/June 2020 - SD7
IBM Systems magazine, IBM Z - May/June 2020 - SD8
IBM Systems magazine, IBM Z - May/June 2020 - SD9
IBM Systems magazine, IBM Z - May/June 2020 - SD10
IBM Systems magazine, IBM Z - May/June 2020 - SD11
IBM Systems magazine, IBM Z - May/June 2020 - SD12
IBM Systems magazine, IBM Z - May/June 2020 - SD13
IBM Systems magazine, IBM Z - May/June 2020 - SD14
IBM Systems magazine, IBM Z - May/June 2020 - SD15
IBM Systems magazine, IBM Z - May/June 2020 - SD16
IBM Systems magazine, IBM Z - May/June 2020 - SD17
IBM Systems magazine, IBM Z - May/June 2020 - SD18
IBM Systems magazine, IBM Z - May/June 2020 - SD19
IBM Systems magazine, IBM Z - May/June 2020 - SD20
IBM Systems magazine, IBM Z - May/June 2020 - SD21
IBM Systems magazine, IBM Z - May/June 2020 - SD22
IBM Systems magazine, IBM Z - May/June 2020 - SD23
IBM Systems magazine, IBM Z - May/June 2020 - SD24
IBM Systems magazine, IBM Z - May/June 2020 - SD25
IBM Systems magazine, IBM Z - May/June 2020 - SD26
IBM Systems magazine, IBM Z - May/June 2020 - SD27
IBM Systems magazine, IBM Z - May/June 2020 - SD28
IBM Systems magazine, IBM Z - May/June 2020 - SD29
IBM Systems magazine, IBM Z - May/June 2020 - SD30
IBM Systems magazine, IBM Z - May/June 2020 - SD31
IBM Systems magazine, IBM Z - May/June 2020 - SD32
IBM Systems magazine, IBM Z - May/June 2020 - SD33
IBM Systems magazine, IBM Z - May/June 2020 - SD34
IBM Systems magazine, IBM Z - May/June 2020 - SD35
IBM Systems magazine, IBM Z - May/June 2020 - SD36
IBM Systems magazine, IBM Z - May/June 2020 - SD39
IBM Systems magazine, IBM Z - May/June 2020 - SD40
IBM Systems magazine, IBM Z - May/June 2020 - SD41
IBM Systems magazine, IBM Z - May/June 2020 - SD42
IBM Systems magazine, IBM Z - May/June 2020 - SD43
IBM Systems magazine, IBM Z - May/June 2020 - SD44
IBM Systems magazine, IBM Z - May/June 2020 - SD45
IBM Systems magazine, IBM Z - May/June 2020 - SD46
IBM Systems magazine, IBM Z - May/June 2020 - SD47
IBM Systems magazine, IBM Z - May/June 2020 - SD48
IBM Systems magazine, IBM Z - May/June 2020 - SD49
IBM Systems magazine, IBM Z - May/June 2020 - SD50
IBM Systems magazine, IBM Z - May/June 2020 - SD51
IBM Systems magazine, IBM Z - May/June 2020 - SD52
IBM Systems magazine, IBM Z - May/June 2020 - SD53
IBM Systems magazine, IBM Z - May/June 2020 - SD54
IBM Systems magazine, IBM Z - May/June 2020 - SD55
IBM Systems magazine, IBM Z - May/June 2020 - SD56
IBM Systems magazine, IBM Z - May/June 2020 - CoverSD3
IBM Systems magazine, IBM Z - May/June 2020 - CoverSD4
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