WebSphere应用服务器V6可扩展性和性能指南

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"WebSphere Application Server V6 Scalability and Performance Handbook.pdf 是一本由IBM International Technical Support Organization 出版的技术手册，旨在帮助用户理解和优化WebSphere Application Server V6的可扩展性和性能。该书由多个专家共同撰写，包括Birgit Roehm、Gang Chen等，属于WebSphere Handbook Series。内容涵盖Web服务器、Servlet和EJB请求的工作负载管理，以及性能监控和调整等关键主题。" 本书针对的主要知识点包括： 1. **WebSphere Application Server V6**: 这是IBM的一款企业级Java应用服务器，版本6在2005年发布，适用于分布式平台。它提供了一个运行和管理Java应用程序的环境，支持各种服务如JDBC、JMS、EJB等。 2. **可扩展性(Scalability)**: 手册深入讨论了如何在需求增长时，通过增加硬件资源、优化配置或调整架构来维持WebSphere Application Server的性能。这包括集群配置、负载均衡和资源管理等方面。 3. **性能(Performance)**: 书中详细介绍了性能监控和调优技术，这对于保持系统高效运行至关重要。这部分可能涵盖CPU使用率、内存管理、线程分析、数据库连接池优化等内容。 4. **工作负载管理(Workload Management)**: 用户可以学习如何有效地分配和控制Web服务器、Servlet和Enterprise JavaBeans(EJB)请求，以确保服务质量和响应时间。 5. **性能监控**: 书中会教授如何使用内置工具和其他工具（如IBM Tivoli Monitoring）来实时监控系统的性能指标，以便及时发现并解决问题。 6. **性能调优(Tuning)**: 调优策略可能涉及JVM参数调整、应用程序代码优化、网络配置优化等，以提高整体系统性能。 7. **安全性(Security)**: 虽然主要关注可扩展性和性能，但安全也是WebSphere Application Server的重要组成部分，可能会提及如何平衡安全设置对性能的影响。 8. **故障排查(Troubleshooting)**: 提供了解决性能问题和故障的方法，帮助管理员快速诊断和修复问题。此书是WebSphere管理员和开发者的重要参考资料，它提供了实践指导和最佳实践，有助于提升WebSphere Application Server V6的稳定性和效率。读者应遵循书中的注意事项，并结合实际环境进行操作。

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xiv WebSphere Application Server V6 Scalability and Performance Handbook

Chapter 17. Performance tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 939

17.1 Testing the performance of an application . . . . . . . . . . . . . . . . . . . . . . 940

17.1.1 Introduction to application performance testing . . . . . . . . . . . . . . 940

17.2 Selecting testing tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 942

17.3 Tools of the trade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 945

17.3.1 ApacheBench . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 945

17.3.2 OpenSTA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 948

17.3.3 Rational Performance Tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . 956

17.3.4 Other testing tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 964

17.4 Performance monitoring guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . 965

17.4.1 Top ten monitoring hotlist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 965

17.4.2 Performance analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 969

17.5 Performance tuning guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 975

17.5.1 Tuning parameter hotlist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 975

17.5.2 Parameters to avoid failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 976

17.5.3 Hardware and capacity settings . . . . . . . . . . . . . . . . . . . . . . . . . . 976

17.5.4 Adjusting WebSphere Application Server system queues . . . . . . 977

17.5.5 Application assembly performance checklist . . . . . . . . . . . . . . . . 991

17.5.6 Java tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002

17.5.7 Operating system tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1012

17.5.8 The Web server. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1015

17.5.9 Dynamic Cache Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1020

17.5.10 Security settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1020

17.5.11 Tuning Secure Sockets Layer . . . . . . . . . . . . . . . . . . . . . . . . . . 1021

17.5.12 Object Request Broker (ORB). . . . . . . . . . . . . . . . . . . . . . . . . . 1022

17.5.13 XML parser selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1025

17.5.14 DB2 tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1026

17.5.15 Additional reference materials. . . . . . . . . . . . . . . . . . . . . . . . . . 1029

Part 7. Appendixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1031

Appendix A. Sample URL rewrite servlet . . . . . . . . . . . . . . . . . . . . . . . . 1033

Setting up the servlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1034

Source code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1034

Steps to install SessionSampleURLRewrite servlet . . . . . . . . . . . . . . . . . . . 1035

Installing the urltest Web module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1035

Appendix B. Additional material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1037

Locating the Web material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1037

Using the Web material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1038

System requirements for downloading the Web material . . . . . . . . . . . . 1038

How to use the Web material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1038

Related publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1039

Notices

This information was developed for products and services offered in the U.S.A.

IBM may not offer the products, services, or features discussed in this document in other countries. Consult

your local IBM representative for information on the products and services currently available in your area.

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product, program, or service may be used. Any functionally equivalent product, program, or service that

does not infringe any IBM intellectual property right may be used instead. However, it is the user's

responsibility to evaluate and verify the operation of any non-IBM product, program, or service.

IBM may have patents or pending patent applications covering subject matter described in this document.

The furnishing of this document does not give you any license to these patents. You can send license

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IBM Director of Licensing, IBM Corporation, North Castle Drive Armonk, NY 10504-1785 U.S.A.

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