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Contents
Send Us Your Comments .................................................................................................................. vii
Preface............................................................................................................................................................ ix
1 Performance Overview
Performance Terms ............................................................................................................................. 1-2
What is Performance Tuning? .......................................................................................................... 1-2
Response Time .............................................................................................................................. 1-3
System Throughput...................................................................................................................... 1-4
Wait Time....................................................................................................................................... 1-4
Critical Resources ......................................................................................................................... 1-5
Effects of Excessive Demand....................................................................................................... 1-6
Adjustments to Relieve Problems .............................................................................................. 1-6
Setting Performance Targets............................................................................................................. 1-7
Setting User Expectations.................................................................................................................. 1-7
Evaluating Performance .................................................................................................................... 1-7
Performance Methodology ............................................................................................................... 1-8
Factors in Improving Performance ............................................................................................ 1-9
Architecture........................................................................................................................................ 1-10
2 Monitoring Your Web Server
Monitoring Processor Use................................................................................................................. 2-2
Using the sar Utility (AIX, HP-UX, Intel Solaris)..................................................................... 2-2
Using the top Utility..................................................................................................................... 2-3