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IBM CICS Performance Series: CICS TS for z/OS V5 Performance Report

Book Description

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.

  • Table of Contents

    1. Front cover
    2. Notices
      1. Trademarks
    3. IBM Redbooks promotions
    4. Preface
      1. Authors
      2. Now you can become a published author, too!
      3. Comments welcome
      4. Stay connected to IBM Redbooks
    5. Part 1 CICS TS for z/OS performance concepts
    6. Chapter 1. Performance terminology
      1. 1.1 CPU Measurement Facility
      2. 1.2 Relative nest intensity
        1. 1.2.1 Memory hierarchy and nest
        2. 1.2.2 Factors that can influence RNI
      3. 1.3 Large Systems Performance Reference
        1. 1.3.1 External throughput rate
        2. 1.3.2 Internal throughput rate
        3. 1.3.3 ITR and ETR relationship
        4. 1.3.4 LSPR ITR ratios
      4. 1.4 Relating LSPR values to a CICS workload
        1. 1.4.1 LSPR alternative
    7. Chapter 2. Test methodology
      1. 2.1 Workloads
      2. 2.2 Workload design
      3. 2.3 Repeatable measurements
      4. 2.4 Driving the workload
      5. 2.5 Summary of performance monitoring tools
        1. 2.5.1 RMF Monitor I
        2. 2.5.2 RMF Monitor III
        3. 2.5.3 CICS TS statistics
        4. 2.5.4 CICS TS performance class monitoring
        5. 2.5.5 Hardware instrumentation counters and samples
      6. 2.6 Collecting performance data
    8. Chapter 3. Workload descriptions
      1. 3.1 Regression testing
      2. 3.2 Data Systems Workload
        1. 3.2.1 DSW static routing
        2. 3.2.2 DSW dynamic routing
        3. 3.2.3 DSW dynamic routing by using IPIC
      3. 3.3 Relational Transactional Workload
      4. 3.4 Liberty servlet with JDBC and JCICS access
    9. Chapter 4. Open transaction environment
      1. 4.1 Introduction to the open transaction environment
      2. 4.2 TCB modes
      3. 4.3 Changing TCB modes
        1. 4.3.1 Java programs
        2. 4.3.2 Programs specifying JVM(NO) and API(CICSAPI)
        3. 4.3.3 Programs specifying JVM(NO) and API(OPENAPI)
        4. 4.3.4 Programs compiled with the XPLINK option
      4. 4.4 Understanding the affect of change mode operations
        1. 4.4.1 CICS Monitoring Facility
        2. 4.4.2 IBM CICS Performance Analyzer for z/OS
        3. 4.4.3 IBM CICS Interdependency Analyzer for z/OS
        4. 4.4.4 IBM z Operational Insights
    10. Part 2 CICS TS performance information
    11. Chapter 5. CICS TS for z/OS V5.1
      1. 5.1 Introduction
      2. 5.2 Release-to-release comparisons
        1. 5.2.1 Data Systems Workload static routing
        2. 5.2.2 DSW dynamic routing
        3. 5.2.3 Relational Transactional Workload threadsafe
        4. 5.2.4 Java throughput
      3. 5.3 Improvements in threadsafety
        1. 5.3.1 Threadsafe API and SPI commands
        2. 5.3.2 Threadsafe program loading
        3. 5.3.3 Use of T8 TCB for JDBC calls
      4. 5.4 Changes to system initialization parameters
        1. 5.4.1 Active keypoint frequency (AKPFREQ)
        2. 5.4.2 Extended dynamic storage area limit (EDSALIM)
        3. 5.4.3 Terminal scan delay (ICVTSD)
        4. 5.4.4 Maximum open TCBs (MAXOPENTCBS)
        5. 5.4.5 Maximum XP TCBs (MAXXPTCBS)
        6. 5.4.6 Maximum tasks (MXT)
        7. 5.4.7 Priority aging interval (PRTYAGE)
        8. 5.4.8 Location of terminal user areas (TCTUALOC)
      5. 5.5 Enhanced instrumentation
        1. 5.5.1 DFHCHNL performance group
        2. 5.5.2 DFHCICS performance group
        3. 5.5.3 DFHDEST performance group
        4. 5.5.4 DFHFILE performance group
        5. 5.5.5 DFHRMI performance group
        6. 5.5.6 DFHSOCK performance group
        7. 5.5.7 DFHSTOR performance group
        8. 5.5.8 DFHTASK performance group
        9. 5.5.9 DFHTERM performance group
        10. 5.5.10 Monitoring domain global statistics
        11. 5.5.11 Loader domain global statistics
      6. 5.6 Virtual storage constraint relief
        1. 5.6.1 24-bit virtual storage
        2. 5.6.2 31-bit storage
        3. 5.6.3 64-bit storage
        4. 5.6.4 Mirror transactions
        5. 5.6.5 XCTL with a communication area
        6. 5.6.6 User exit global work area
        7. 5.6.7 Related APARs
      7. 5.7 64-bit application support
      8. 5.8 Java 7 and zEnterprise EC12
      9. 5.9 CICSPlex System Manager dynamic routing
      10. 5.10 Workload consolidation
        1. 5.10.1 Consolidating a COBOL VSAM workload
        2. 5.10.2 Consolidating the GENAPP workload
      11. 5.11 Effect of threadsafe transient data
        1. 5.11.1 Maximizing time on an open TCB
        2. 5.11.2 Sample transient data and DB2 application
        3. 5.11.3 CICS monitoring data results
        4. 5.11.4 Throughput results
      12. 5.12 Transaction isolation
        1. 5.12.1 Unique subspaces
        2. 5.12.2 Common subspace
        3. 5.12.3 Base space
        4. 5.12.4 Transaction isolation performance effect
        5. 5.12.5 Page and extent sizes
    12. Chapter 6. CICS TS for z/OS V5.2
      1. 6.1 Introduction
      2. 6.2 Release-to-release comparisons
        1. 6.2.1 Data Systems Workload static routing
        2. 6.2.2 DSW dynamic routing
        3. 6.2.3 Relational Transactional Workload non-threadsafe
        4. 6.2.4 RTW threadsafe
        5. 6.2.5 Java servlet that uses JDBC and VSAM
      3. 6.3 Improvements in threadsafe API and SPI commands
      4. 6.4 Changes to system initialization parameters
        1. 6.4.1 Maximum tasks
        2. 6.4.2 Maximum open TCBs (MAXOPENTCBS)
        3. 6.4.3 Maximum XP TCBs (MAXXPTCBS)
      5. 6.5 Enhanced instrumentation
        1. 6.5.1 Dispatcher global statistics
        2. 6.5.2 Dispatcher TCB mode statistics
        3. 6.5.3 Dispatcher TCB pool statistics
        4. 6.5.4 Monitoring domain global statistics
        5. 6.5.5 Transaction manager global statistics
      6. 6.6 Kerberos
        1. 6.6.1 Kerberos test configuration
        2. 6.6.2 Kerberos performance results
        3. 6.6.3 Kerberos support conclusion
      7. 6.7 JSON support
        1. 6.7.1 JSON support test configuration
        2. 6.7.2 Scalability as a function of response size
        3. 6.7.3 Scalability as a function of request rate
        4. 6.7.4 JSON support conclusion
      8. 6.8 Java applications and trace
      9. 6.9 Web service over HTTP improvements
        1. 6.9.1 Web services real storage usage
        2. 6.9.2 Web services CPU reduction
      10. 6.10 Java 7.0 and Java 7.1
    13. Chapter 7. CICS TS for z/OS V5.3
      1. 7.1 Introduction
      2. 7.2 Release-to-release comparisons
        1. 7.2.1 Data Systems Workload dynamic routing
        2. 7.2.2 RTW threadsafe
      3. 7.3 Improvements in threadsafety
        1. 7.3.1 Threadsafe API and SPI commands
        2. 7.3.2 Optimizations for SSL support
        3. 7.3.3 Offloading authentication requests to open TCBs
      4. 7.4 Changes to system initialization parameters
        1. 7.4.1 Storage protection
        2. 7.4.2 Internal trace table size
      5. 7.5 Enhanced instrumentation
        1. 7.5.1 DFHCICS performance group
        2. 7.5.2 DFHTASK performance group
        3. 7.5.3 DFHTEMP performance group
        4. 7.5.4 DFHWEBB performance group
        5. 7.5.5 Monitoring domain global statistics
        6. 7.5.6 TCP/IP global statistics
        7. 7.5.7 URIMAP global statistics
      6. 7.6 Low-level CICS optimizations
        1. 7.6.1 Monitoring and trace enabled
        2. 7.6.2 Monitoring disabled, trace enabled
        3. 7.6.3 Monitoring enabled, trace disabled
        4. 7.6.4 Monitoring and trace disabled
        5. 7.6.5 Monitoring and trace disabled with low numbers of MRO sessions
        6. 7.6.6 Low-level CICS optimizations conclusions
      7. 7.7 Web support and web service optimization
      8. 7.8 Java workloads
        1. 7.8.1 Java workload configuration
        2. 7.8.2 Java servlet workload
        3. 7.8.3 Java OSGi workload
      9. 7.9 Java 8 performance
        1. 7.9.1 Improvements in Java 7.0, Java 7.1, and Java 8
        2. 7.9.2 Java performance benchmarks in CICS
        3. 7.9.3 Java 8 and OSGi applications
        4. 7.9.4 Java 8 and Liberty servlet applications
        5. 7.9.5 Java 8 and z/OS Connect applications
      10. 7.10 Simultaneous multithreading with Java workloads
        1. 7.10.1 Introduction to SMT
        2. 7.10.2 Measuring SMT performance
        3. 7.10.3 CICS throughput improvement
      11. 7.11 Reporting of CPU time to z/OS Workload Manager
      12. 7.12 z/OS Connect for CICS
        1. 7.12.1 CICS TS V5.3 performance enhancement
        2. 7.12.2 Varying payload sizes by using Java parser
        3. 7.12.3 Comparing Java and native parsers
        4. 7.12.4 Comparing Java and native parsers with varying request sizes
        5. 7.12.5 Comparing Java and native parsers with varying response sizes
        6. 7.12.6 Native parser conclusion
      13. 7.13 HTTP flow control
        1. 7.13.1 Server accept efficiency fraction
        2. 7.13.2 Flow control configuration
        3. 7.13.3 Flow control operation
        4. 7.13.4 CICS statistics enhancements
        5. 7.13.5 Comparison of SOTUNING options
      14. 7.14 High transaction rate performance study
    14. Related publications
      1. CICS performance series
      2. IBM Redbooks
      3. Other publications
      4. Online resources
      5. Help from IBM
    15. Back cover