Download Performance and Capacity Experiences with Websphere

Performance and Capacity
Experiences with
Websphere on z/OS &
OS/390
CMG Canada
April 24, 2002
Agenda
RBC Environment
 WebSphere Overview
 Performance Challenges
 Capacity Challenges
 Summary
 Bibliography

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.
WebSphere Overview
WebSphere is brand name.
 WAS is flagship product
 MQ is now WebSphere MQ.
 Lots more things to be named
WebSphere

Legacy
Apps
From Glenn Anderson CMG presentation
WAS Infrastructure
WTR (trace)
From Glenn Anderson CMG presentation
Dealing with WebSphere
Nomenclature






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.
Come to Terms with these






Server Instance.
Server
EJBs
Servelet
JSPs
Plugins





WAS
JVM
JDBC
IMS Connector
Httpd.conf
Performance Challenges
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
HTTP Performance Data
WAS Performance Data

SMF-120
Server Activity
– Transactions & Volumes
 Communication Sessions
 Container Activity

• Class section
• Method section
Interval records for Server & Container
WAS Performance Data
MVS Performance Data

WLM Report for IWEB & CB
Number of transactions
 Response time
 Cpu usage
 Delays
 Performance Index


RMF Type-72 Goal Mode
MVS Performance Data
(cont)
STC Application Environment usage
 USS stats
 TCP/IP stats
 MQ stats

HTTP Logs
Each request is logged
 Client IP address
 What URL & page was requested
 Status returned

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

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
Factors which affect
Performance
Web site design
 Security policies
 Application design
 Websphere configuration
 Development process
 External issues

Operating systems
 Network

Application Considerations
Avoid object serialisation
 Minimise size and complexity of
objects
 Avoid string concatenation
 Careful object creation and reuse

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
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)

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?

News you can use
WLM settings to check.
 Application environment set-up
 HTTP.CONF directives.

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
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
Workload Selection List
Name
CB
Description
WAS Application Server
CICS
CICS regions
DB2
DB2 transactions
IMS
IMS online regions
IODRIVER special class for
IWEB HTML and Servlet
Processing
Subsystem Type CB - Component Broker via WAS
Qualifier
Qualifier
type
name
SI
BBOASR2A
SI
BBAASR2A
From Jes2 Job log
BBOU0001I CB SERIES CONTROL REGION BBOASR2A IS STARTING.
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
From Glenn Anderson CMG presentation
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!
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.
