Lect5.ppt - 10/13/04

CIS 4100 Systems Performance and Evaluation

Lecture 7

byZornitza Genova Prodanoff

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Lecture Outline

Chapter 5 – Planning the Capacity of Web Services

Adequate Capacity

Capacity Planning Methodology

Understanding the Environment

Workload Characterization

Workload Forecasting Performance Modeling and Prediction

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Adequate Capacity

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Capacity Planning Methodology

The methodology relies on:

• Workload Model

• Performance Model

• Cost Model

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Capacity Planning Methodology

Phases of the methodology:

• Phase 1: Understanding the environment - learning what hardware, software, network protocols are present

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Capacity Planning Methodology

Phases of the methodology:

• Phase 2: Workload characterization – breaking the global workload into basic components is important, because basic components can be described with quantifiable parameters.

e.g. transaction arrival rates, service demand, etc.

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Capacity Planning Methodology

Phases of the methodology:

• Phase 2: Workload characterization – many parameters are not measured directly, but are obtained by deriving their values from other (measurable) parameters.

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Capacity Planning Methodology

Phases of the methodology:

• Phase 2: Workload characterization – data collection issues: benchmarks or ROT maybe needed instead of raw measurements.

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Capacity Planning Methodology

Phases of the methodology: • Phase 2: Workload characterization

Example 5.1 / Page 189

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Capacity Planning Methodology

Phases of the methodology:

• Phase 3: Workload validation – running synthetic workload and comparing results against the raw data results. If margin of error is within 10-30%, model is valid.

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Capacity Planning Methodology

Phases of the methodology:

• Phase 4: Workload forecasting – predicating how the system workload will change/vary in the future.

Example 5.2 / Page 191Example 5.3 / Page 194

Example 5.4 / Page 199 Solve the problem when throughput is only 600,324

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