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Performance and Capacity Experiences with Websphere on z/OS & OS/390

This presentation discusses performance and capacity challenges faced while using Websphere on z/OS and OS/390. It covers topics such as RBC environment, Websphere overview, performance challenges, capacity challenges, and provides lessons learned.

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Performance and Capacity Experiences with Websphere on z/OS & OS/390

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  1. Performance and Capacity Experiences with Websphere on z/OS & OS/390 CMG Canada April 24, 2002

  2. Agenda • RBC Environment • WebSphere Overview • Performance Challenges • Capacity Challenges • Summary • Bibliography

  3. RBC Environment • 3 production datacentres 1 Development. • Over 8500 MIPS. • 250 Million transactions weekly. • Over 100 major OS/390 Applications. • 3 Websphere Applications in Production • 12 Websphere Apps in Development. • Employ IMS CICS DB2.

  4. WebSphere Overview • WebSphere is brand name. • WAS is flagship product • MQ is now WebSphere MQ. • Lots more things to be named WebSphere

  5. Legacy Apps From Glenn Anderson CMG presentation

  6. WAS Infrastructure WTR (trace)

  7. From Glenn Anderson CMG presentation

  8. HTTP SERVER Comes free with OS. AKA: Web Server, Apache server. In WLM subsystem type is IWEB. Runs static HTML, CGI, Servelets and JSPs. Plugins WAS Version 4.0 (Websphere Application server) Use to be Component Broker. In WLM subsystem type is CB. Got to pay extra for it. Runs EJBs, servelets, JSPs. Dealing with WebSphere Nomenclature

  9. Server Instance. Server EJBs Servelet JSPs Plugins WAS JVM JDBC IMS Connector Httpd.conf Come to Terms with these

  10. Performance Challenges

  11. HTTP Performance Data • SMF-103 Configuration Performance Interval - Number & type of requests/replies - bytes received/sent - Error counts - Thread/cache/memory - CGI/DNS/SSL/Proxy/Plugin response time

  12. HTTP Performance Data

  13. WAS Performance Data • SMF-120 • Server Activity – Transactions & Volumes • Communication Sessions • Container Activity • Class section • Method section Interval records for Server & Container

  14. WAS Performance Data

  15. MVS Performance Data • WLM Report for IWEB & CB • Number of transactions • Response time • Cpu usage • Delays • Performance Index • RMF Type-72 Goal Mode

  16. MVS Performance Data (cont) • STC Application Environment usage • USS stats • TCP/IP stats • MQ stats

  17. HTTP Logs • Each request is logged • Client IP address • What URL & page was requested • Status returned

  18. Performance Issues • Large memory requirements • Application Environment is dynamic • Performance Tools are limited • Interaction with various components • SMF/RMF data is limited • Performance can be erratic and slow

  19. Performance Tools • Websphere Studio App Dev Performance Analyzer • Websphere Resource Analyzer • Websphere Site Analyzer • Websphere Performance Monitoring APIs • Stress Testing Tools • Web logs & Application logs • Real-time Monitors • Websphere for Windows/NT evaluation

  20. Factors which affect Performance • Web site design • Security policies • Application design • Websphere configuration • Development process • External issues • Operating systems • Network

  21. Application Considerations • Avoid object serialisation • Minimise size and complexity of objects • Avoid string concatenation • Careful object creation and reuse

  22. Lessons Learned • Websphere still evolving • Tradeoffs in using existing functions (shorted development) vs “roll your own code” (improved performance) • Get performance & capacity analysts involved early • Produce guidelines for application developers which deal with performance issues • Share experiences & learn from others

  23. Lessons Learned (cont.) • JSP (Java Server Pages) = dynamic & more costly than static • More complex queries to induce client to perform function (I.e. benefit of doing it online) • No permanent connection between user & system (so must have other ways of remembering things)

  24. Capacity Challenges • What constitutes a transaction? • How much resources to put aside ? • Large processor storage needs. • How to handle new volatile peaks. • What are we measuring?

  25. News you can use • WLM settings to check. • Application environment set-up • HTTP.CONF directives.

  26. WLM Definition Menu 1. Policies 2. Workloads 3. Resource Groups 4. Service Classes 5. Classification Groups 6. Classification Rules 7. Report Classes 8. Service Coefficients/Options 9. Application Environments 10. Scheduling Environments

  27. Appl Environment Name . . WEBprod Description . . . . . . . Prod web Subsystem type . . . . . IWEB or CB Procedure name . . . . . XXXWEB Start parameters . . . . IWMSN=&IWMSSNM,IWMAE='WEB_prod',JOBNAME= XXXWEB Limit on starting server address spaces for a subsystem instance: Single address space per system

  28. Workload Selection List Name Description CB WAS Application Server CICS CICS regions DB2 DB2 transactions IMS IMS online regions IODRIVER special class for IWEB HTML and Servlet Processing

  29. Subsystem Type CB - Component Broker via WAS Qualifier type Qualifier name SI BBOASR2A SI BBAASR2A From Jes2 Job log BBOU0001I CB SERIES CONTROL REGION BBOASR2A IS STARTING.

  30. Subsystem Type Selection List for Rules CB Component Broker WAS CICS CICS TRX-level DB2 Use Modify to DDF DB2 DDF Enclaves IWEB WEB Server Test

  31. From Glenn Anderson CMG presentation

  32. Summary • Get familiar with the elements • Education (CMG, Google, IBM Redbooks) • New terminology, but concepts familiar • Tools & documentation are somewhat limited • Learn how to deal with this Chameleon!

  33. Bibliography • Enterprise JavaBeans for z/OS and OS/390 (ibm.com/redbooks) • WebSphere Application Server V4.0 for z/OS and OS/390: Installation and Customization • MVS planning workload management (sa22-7602) • Glenn Anderson CMG presentation.

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