Table of Contents
Random Models of Performance - Why take a chance?
Introduction
Notions of performance
Mainframe computer
Multi-access systems
Client-server systems
Complex systems
Questions
Some disasters
Capacity planning ...
… fundamentally lacking
Some disasters
New database
Some disasters
Distributed office system
Capacity planning successes
Cache placement
PPT Slide
Work flow management
Breakdown of response time
Location of images
The solution
Types of model
A student’s dilemma
A gambler’s problem
An optimal strategy?
First Result in Performance Modelling
Answer
Single server queue
Queueing Networks
Solution methods
Product-form solution
Solution algorithms
Further developments
Response time distributions
Response times in queueing networks
Open tree-like networks
Closed tree-like networks
Contemporary Methodologies
Queues with negative customers
Response times
Applications
Contemporary Methodologies
Process Algebras
SPA for performance modelling
Some modelling successes
Multi-access computer system
Queueing network model
Predictions
Some modelling successes
ALICE Concrete Architecture
Performance
Performance
Some modelling successes
Client-server Model
Athene model output
Predicted response times
Response time probability density
The future
Performance Engineering
Tools
Close
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