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Chapter 17. Performance tuning
Performance tuning is a complex task that spans multiple components and areas with the
goal of improving system performance. It is heavily dependent on the hardware, software, and
external factors that are employed in your enterprise. Performance numbers advertised in this
chapter are based on measurements and projections using standard IBM benchmarks in a
controlled environment. Therefore, the performance gains for your system can differ. Using a
standard performance methodology and extensive profiling is advisable to understand an
application’s bottlenecks in production load scenarios.
WebSphere Application Server V8.5 delivers a highly scalable and highly-available platform
for applications. It provides multiple tuning options to optimize runtime performance.
This chapter focuses on the z/OS system and suggests methods by which you can improve
performance through a combination of product features and application development
considerations. It includes the following topics:
Introduction to WebSphere Application Server for z/OS V8.5 performance
External factors and z/OS specifics
Performance tuning templates
64-bit considerations
JVM tuning
Connection pool tuning
Runtime provisioning
Pass by reference
Logging and tracing
Tuning workload management on z/OS systems
Fast response cache accelerator and caching
Using WebSphere for z/OS Optimized Local Adapters
IBM HTTP Server Status monitoring page
Too ls
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