Performance Tuning for Content Manager

66 Performance Tuning for Content Manager

There are two basic types of content from the caching point of view:

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Static content does not change over long periods of time. The content type

can be HTML, JSP rendering less dynamic data, GIF, and JPG.

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Dynamic content includes frequently updated content (such as stock

exchange rates), as well as personalized and customized content. Although it

is changing content, it also must be stable over a long enough time for

meaningful reuse to occur. However, if some content is very frequently

accessed, such as requests for pricing information of a popular stock, then

even a short time of stability might be long enough to benefit from caching.

Java Virtual Machine Profiler Interface

The Java Virtual Machine Profiler Interface (JVMPI) enables the collection of

information, such as data about garbage collection, and the Java virtual machine

(JVM) API that runs the application server. The Tivoli Performance Viewer

leverages a JVMPI to enable more comprehensive performance analysis.

JVMPI is a two-way function call interface between the JVM API and an

in-process profiler agent. The JVM API notifies the profiler agent of various

events, such as heap allocations and thread starts. The profiler agent can activate

or deactivate specific event notifications based on the needs of the profiler.

JVMPI supports partial profiling by enabling the user to choose which types of

profiling information to collect and to select certain subsets of the time during

which the JVM API is active. JVMPI moderately increases the performance

impact.

Parameter hot list

Each WebSphere Application Server process has several parameters that

influence 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.

Always review the tuning parameter hot list, which is a subset of the tuning

parameter index. These parameters have an important impact on performance.

Because these parameters are application dependent, the parameter settings for

specific applications and environments can vary.

2.2.5 Routine maintenance

WebSphere Application Server collects data about runtime and applications

through the Performance Monitoring Infrastructure (PMI). Performance data can

then be monitored and analyzed with a variety of tools.