Performance indicators and factors

The performance of CICS Transaction Gateway can be measured to understand the factors that affect performance, and to use the information provided to optimize that performance.

Performance indicators

Performance indicators provide an understanding of which system components most affect performance and include the following information:
  • Processor loading
  • Data transfer rates
  • Response times.

This information helps you understand the factors that affect CICS Transaction Gateway performance and achieve the best performance from your system.

EXCI or IPIC

Performance over EXCI is generally better than IPIC. However, IPIC performance can be greatly improved if a zAAP is deployed which will significantly reduce the CPU cost per transaction. EXCI is limited to 32K payloads using a COMMAREA, whereas IPIC payloads can be as large as 50MB using channels and containers.

Factors that can affect performance

System components that can affect performance include:

The performance of CICS Transaction Gateway also depends on whether:
  • Connections are reused
  • CICS Transaction Gateway is running in local or remote mode
  • Requests are synchronous or asynchronous, and whether requests are part of two-phase commit transactions
  • Tracing is enabled

Factors that can improve performance

Factors that can help improve performance include:
  • The multithreaded model and thread pooling to ensure the efficient reuse of connections
  • Performance tuning and the use of default values to give a good balance between resource use and the ability to handle increased workload (scalability)
  • Data compression can reduce the amount of data flowed over network connections. For more information see Java security exit data compression samples.

Monitoring performance

Ways of monitoring performance include:
  • Performance monitoring tools such as RMF (Resource Management Facility), request monitoring exits, and IBM Tivoli OMEGAMON XE for CICS (on z/OS)
  • Statistics for monitoring and managing system resources.
  • For more information see Statistics and monitoring.

Information Information

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Timestamp icon Last updated: Tuesday, 19 November 2013


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