Performance resources
These resources additional information and about performance:
WebSphere Application Server performance resources
WebSphere Application Server 5.0 for iSeries Performance Considerations 
This page provides links to information about basic performance considerations for WebSphere Application Server. Although this information is intended for WebSphere Application Server Version 5.0, you can apply many of the same general practices to optimize performance for WebSphere Application Server - Express Version 5.1.
WebSphere and Java tuning tips
This page provides links to papers and articles that can help you take advantage of the latest iSeries performance improvements, tools, and tuning methods to optimize WebSphere Application Server - Express performance.
Java(TM) performance resources
Tuning Garbage Collection for Java(TM) and WebSphere on iSeries
This PDF manual describes how to configure garbage collection for Java applications that run in WebSphere Application Server - Express. You can find additional information about garbage collection at IBM developerWorks.
Performance Documentation for the Java Platform
Sun Microsystems, Inc. provides links to performance documentation for the Java Platform.
Optimize your Java application's performance
This article examines the optimization process as a whole, rather than focusing on a single technique. You can also use the search function of the IBM developerWorks Web site to find additional information about Java application performance.
Basic Java Performance for iSeries
This white paper explains JIT-MMI, the user classloader verification cache, and memory pool considerations.
iSeries performance resources
Tune Java program performance with the IBM Developer Kit for Java
This Information Center topic describes how you can use the IBM Developer Kit for Java to optimize the performance of your Java applications.
Performance management
This Web site provides extensive information about iSeries performance management.
Performance Management Resource Library
This page provides links to information that you can use to optimize server performance. The resource library includes white papers, articles, tools documentation, and more.
Performance Capabilities Reference Manual
The Performance Management Library provides links to several editions of the Performance Capabilities Reference Manual. This manual includes information about optimizing performance for DB2 UDB for iSeries, Web servers and WebSphere products, and Java applications.
Performance
This Information Center topic provides extensive information about managing and tuning the performance of your iSeries server.
Performance tools
WebSphere Application Server Performance Tuning and Analysis Tools
This high-level online course is offered through IBM eServer Solutions Enablement. The course describes elements that can affect WebSphere Application Server - Express performance, provides basic guidelines to help you acheive optimal performance, and discusses various available tools that you can use to analyze and tune performance.
Heap Analysis Tools for Java(TM)
This tool is a component of the iDoctor for iSeries suite of performance monitoring tools. The Heap Analysis Tools component performs Java application heap analysis and object create profiling (size and identification) over time. This tool is sometimes called Java Watcher or Heap Analyzer.
Applications for performance management
This Information Center topic provides links to several tools that you can use to monitor and manage iSeries performance.
The ANZJVM (Analyze Java Virtual Machine) command
The ANZJVM command collects information about the Java Virtual Machine (JVM) for a specified job. This command is available in i5/OS V5R2 and later.
The Dump Java Virtual Machine (DMPJVM) command
This command dumps JVM information for a specified job.
Performance Tools
Performance Tools for iSeries is a set of tools and commands that you can use to view and analyze iSeries performance data in several ways. See this Information Center topic for more information.
Performance Explorer (PEX) Information Center topic
Performance explorer is a data collection tool that helps you identify the causes of performance problems that cannot be identified with the other available tools or general trend analysis. See this Information Center topic for more information.
Performance Explorer (PEX) Web site
This Web site provides additional information about PEX.
Performance Trace Data Visualizer
Performance Trace Data Visualizer (PTDV) for iSeries is a tool for processing, analyzing, and viewing Performance Explorer collection data residing in PEX database files.
Performance Data Collector tool
The Performance Data Collector (PDC) tool provides profile information about the programs that run on the iSeries server. See this Information Center topic for more information.
Collection Services
You can use Collection Services to collect performance data, which you can analyze with other performance tools. See this Information Center topic for more information.
IBM Performance Management for eServer iSeries Information Center topic
IBM Performance Management for iSeries (formerly known as PM/400) uses Collection Services to gather the nonproprietary performance and capacity data from your server and then sends the data to IBM for analysis. See this Information Center topic for more information.
IBM Performance Management for eServer iSeries Web site
This Web site provides additional information about PM for eServer iSeries.
iDoctor for iSeries
iDoctor for iSeries is a suite of applications that can help you monitor performance and troubleshoot common problems on your iSeries server.