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Lect5.ppt - 02/13/06 CIS 4100 Systems Performance and Evaluation Lecture 5 by Zornitza Genova Prodanoff
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Lect5.ppt - 02/13/06
CIS 4100 Systems Performance and Evaluation
Lecture 5
byZornitza Genova Prodanoff
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Lecture Outline
CHAPTER 4 - Performance Issues of Web Services
From Boxes to Services - Web Server Overview
Perception of Performance
Where Are the Delays?
Web Infrastructure
Server Architectures Networks
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Performance Issues of Web Services
From Boxes to Services
Web services: - self-contained, modular applications- can be described, published and evoked over the Internet
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Performance Issues of Web Services
Example 4.1/Page 124
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Performance Issues of Web Services
Web Server Overview
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Performance Issues of Web Services
Web Server Overview
- HTML and XML
Extensible Markup Language (XML)Uses tags and attributes to delimit dataUsed to organize data, but leaves processing to the application
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Performance Issues of Web Services
Web Server Overview
- Hardware and Operating System: Web servers run on top of time-sharing, multi-user OSs
- ContentsEmbedded content within HTML
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Performance Issues of Web Services
Perception of Performance
Web services different than distributed systems:- randomness of Web site visits (non-deterministic)- the number of users can be very large > millions
Metrics Users:
Fast response timeNo connection refusals
Management:High throughput High availability
Example 4.2
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Performance Issues of Web Services
Perception of Performance
Quality of Service (what users want):
- Performance (fast response times)
- Availability (up, on-line or not)
- Reliability: (probability that a Web service will perform in a satisfactory manner for a given period of time, given OS and load conditions)
- Predictability- Cost (affordability)- Security
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Where Are the Delays?
Anatomy of a Web Transaction Bottlenecks
Performance Issues of Web Services
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Anatomy of a Web Transaction – Example 4.3
Performance Issues of Web Services
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Bottlenecks
Example 4.4Example 4.5
Performance Issues of Web Services
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Web Infrastructure
Performance Issues of Web Services
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Web Infrastructure
Basic Components
Performance Issues of Web Services
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Web Infrastructure
Proxy, Cache, and Mirror Example 4.6
Example 4.7
Performance Issues of Web Services
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Web Infrastructure
Content Delivery Networks
Performance Issues of Web Services
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Performance Issues of Web Services - The WAP Infrastructure
