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CSE 322: Software Reliability Engineering

CSE 322: Software Reliability Engineering. Topics covered: Architecture-based reliability analysis. Introduction and motivation. Benefits of architecture-based analysis. Application architecture. Architecture: Components: Interactions:. Application architecture (contd..).

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CSE 322: Software Reliability Engineering

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  1. CSE 322: Software Reliability Engineering Topics covered: Architecture-based reliability analysis

  2. Introduction and motivation

  3. Benefits of architecture-based analysis

  4. Application architecture • Architecture: • Components: • Interactions:

  5. Application architecture (contd..) • Sequential application: • Dynamic behavior:

  6. Application architecture (contd..) • Types of applications:

  7. Application architecture (contd..) • Models used: • Mapping of control-flow graph to models:

  8. Application architecture (contd..) • Type of models:

  9. DTMC analysis • Overview of DTMCs: • Absorbing: • Irreducible:

  10. Analysis of absorbing DTMCs

  11. Analysis of absorbing DTMCs (contd..)

  12. Analysis of irreducible DTMCs

  13. 1 2 3 4 5 6 7 8 9 10 Example of architecture analysis • Terminating application • 10 modules • 1 is the input, 10 is the exit module • Architecture modeled by absorbing • DTMC Probability that the control is transferred to module j, upon execution of modulei

  14. Example of architecture analysis (contd..) Intercomponent transition probabilities

  15. Example of architecture analysis (contd..) Computed for component i Component Mean number of visits 1 1.0000 0.0000 Variance of the number of visits 2 0.9077 0.6444 3 0.9107 0.5499 4 0.4184 0.3928 5 1.3504 0.7185 6 0.2510 0.2319 7 0.6155 0.6261 8 0.8737 0.4225 9 0.3831 0.2462 10 1.0000 0.0000

  16. Example of architecture analysis (contd..) • Non-terminating application • 10 modules • Architecture modeled by irreducible • DTMC • Reliability of each component known 1 2 3 4 Probability that the control is transferred to module j, upon execution of modulei 5 6 7 8 9 10

  17. Example of architecture analysis (contd..) Intercomponent transition probabilities Addition of two transitions to absorbing DTMC to make it irreducible

  18. Example of architecture-based analysis (contd..) Component 1 0.1073 Computed for component i 2 0.1055 Utilization of the component 0.1091 3 0.0765 4 0.1714 5 0.0459 6 0.0823 7 0.1129 8 0.0549 9 0.1341 10

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