Why and when to perform this task
Tuning parameter index for z/OS
Performance tuning for WebSphere
for z/OS becomes a complex exercise because the nature of the runtime involves
many different components of the operating system and middleware. Use the Tuning index for WebSphere Application Server for z/OS to find information and parameters for tuning
the z/OS operating system, subsystems, the WebSphere for z/OS runtime environment,
and some J2EE application tuning tips.
Recommendation:
Before you read a description of WebSphere for z/OS tuning guidelines, it
is important to note that, no matter how well the middleware is tuned, it
cannot make up for poorly designed and coded applications. Focusing on the
application code can help improve performance. Often, poorly written or designed
application code changes will make the most dramatic improvements to overall
performance.
The tuning guide focuses on server tuning. If you want to tune your applications, see Performance: Resources for learning for more information about application tuning.
For your convenience, procedures for tuning parameters in other products, such as DB2, Web servers and operating systems are included. Because these products might change, consider these descriptions as suggestions.
Each WebSphere Application Server process has several parameters influencing application performance. You can use the WebSphere Application Server administrative console to configure and tune applications, Web containers, EJB containers, application servers and nodes in the administrative domain.
If you are a WebSphere Application Server Administrator or Systems programmer on z/OS, refer to Tuning index for WebSphere Application Server for z/OS for z/OS specific tuning tips.
Each parameter in the tuning parameter index links to information that explains the parameter, provides reasons to adjust the parameter, how to view or set the parameter, as well as default and recommended values.
The WebSphere Application Server contains interrelated components that must be harmoniously tuned to support the custom needs of your end-to-end e-business application.
The JVM offers several tuning parameters affecting the performance of WebSphere Application Servers (which are primarily Java applications), as well as the performance of your applications.
Several topics including Web modules, EJB modules, client modules, Web services and application services comprise the application programming model and provide numerous services supporting deployed applications.
WebSphere supports the integration of several different database systems. Each is tuned in its own manor. DB2 tuning parameters are provided for your convenience.
Java messaging service (JMS) can be tuned to balance memory with the servicing of the JMS subscribers.
Security may have an affect on performance depending on certain actions taken.