Preface
This IBM® Redbooks® publication gives a broad understanding of several important concepts that are used when describing IBM CICS® Transaction Server (TS) for IBM z/OS® (CICS TS) performance. This publication also describes many of the significant performance improvements that can be realized by upgrading your environment to the most recent release of CICS TS.
This IBM Redbooks publication targets the following audience:
•Systems Architects wanting to understand the performance characteristics and capabilities of a specific CICS TS release.
•Capacity Planners and Performance Analysts wanting to understand how an upgrade to the latest release of CICS TS affects their environment.
•Application Developers wanting to design and code highly optimized applications for deployment into a CICS TS environment.
This publication covers the following topics:
•A description of the factors that are involved in the interaction between IBM z Systems™ hardware and a z/OS software environment.
•A definition of key terminology that is used when describing the results of CICS TS performance benchmarks.
•A presentation of how to collect the required data (and the methodology used) when applying Large Scale Performance Reference (LSPR) capacity information to a CICS workload in your environment.
•An outline of the techniques that are applied by the CICS TS performance team to achieve consistent and accurate performance benchmark results.
•High-level descriptions of several key workloads that are used to determine the performance characteristics of a CICS TS release.
•An introduction to the open transaction environment and task control block (TCB) management logic in CICS TS, including a reference that describes how several configuration attributes combine to affect the behavior of the CICS TS dispatcher.
•Detailed information that relates to changes in performance characteristics between successive CICS TS releases, covering comparisons that relate to CICS TS V4.2, V5.1, V5.2, and V5.3.
•The results of several small performance studies to determine the cost of using a specific CICS functional area.
Authors
This book is one in a series that is focused on CICS performance. It is written by members of the IBM Hursley CICS development community. The subject matter in this series is based on feedback from CICS customers.
Ian Burnett is the CICS Transaction Server performance team lead working for IBM United Kingdom. He has worked in IBM since 2001 as part of the development teams for several products, including IBM WebSphere® Application Server, WebSphere MQ, and IBM CICSPlex® System Manager. Since 2009, Ian has lead the performance team in Hursley, with experience in a wide range of CICS performance topics. He holds a Bachelor’s degree in Computer Science from the University of Warwick in the UK.
John Burgess is a Senior Software Engineer working in the IBM Hursley CICS performance team. He has over 20 years experience with CICS and specializes in the performance of large systems.
Graham Rawson is a CICS Performance Analyst within the CICS Development group based at the IBM Laboratory in Hursley, England. Graham has worked for IBM for over 25 years in various roles supporting CICS Transaction Server and IBM Java technology. Graham holds a B.Sc. (Hons) in Chemistry from the University of East Anglia (Norwich, England) and a Certificate in Software Engineering from the University of Oxford (England).
The project that produced this publication was managed by Marcela Adan, IBM Redbooks Project Leader - International Technical Support Organization.
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