Performance-Oriented Software Architecture Engineering: an Experience Report
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1 Performance-Oriented Software Architecture Engineering: an Experience Report Chung-Horng Lung, Anant Jalnapurkar, Asham El-Rayess SEAL - Software Engineering Analysis Lab Nortel Networks
2 Software Architecture Analysis Established in 1995 Adopted SAAM (Software Architecture Analysis Method) developed at SEI Scenario-based analysis Non-functional quality attributes like maintainability, scalability, and etc.
3 Why Architecture Analysis? Increasing complexity of software systems The need to analyze and design systems at higher levels of abstraction The demand to reduce maintenance costs for evolution Often conducted in an ad-hoc manner
4 Motivation to Integrate SA and SPE The main reasons are: Performance issue keep recurring for real-time applications. Need to demonstrate how to improve quality attributes, especially performance in a systematic approach. Software architecture and software performance are tightly coupled. Performance-Oriented Software Architecture Engineering
5 Performance-Oriented SW Architecture Eng Critical elements of POSAE: SAAM Stakeholders and their values Architectural views Software partitioning and clustering Software performance engineering Automatic generation of performance models Software architecture trade-off analysis
6 Software Architecture Views Styles & patterns, Mapping of components & functions Structure diagram, Object diagram, Module diagram Static View Map View Messaging diagram, Causal diagram, Interaction diagram State machines Dynamic View Resource View Performance modeling Concurrency, Simulation
7 POSAE Process - Iterative & Incremental Develop or capture a software architecture (static view) Identify scenarios, particularly real-time (RT) scenarios (scenario development) Identify execution paths for RT scenarios (dynamic view) Apply performance modeling, analysis, and measurements (resource view) Perform architecture analysis based on performance modeling results (map view, dynamic view, and resource view) Conduct trade-off analysis (scenario & 4 views) Build a prototype, based on the analysis, to improve performance or other qualities
8 Performance Modeling & MAGE Application / Application Prototype Instrumentation Data Collection Capacity Planning Model Generation Simulation / Analysis Tools Load Balancing Bottleneck Analysis Rapid Application Development Reverse Engineering MAGE Etc...
9 Software Partitioning: an Example S1 S1 E1 E1 E2 E3 E3 E6 S2 E4 E8 S3 S2 E2 E5 S3 E5 E6 E7 E9 E8 E4 E7 E9
10 Lessons Learned End-to-end analysis provides valuable insights. Messaging system, run-time environment, application framework, and the high-level services and applications. Software architecture is a critical asset & important to SPE. Need an engineering approach. Analysis of the interactions of scenarios, not just individual scenarios, are necessary. Example, scenarios query processing, update processing, and OS scheduling interact. Automation of performance model generation and analysis is needed. Prototyping is useful to show values & alternatives. Domain knowledge plays a critical role.
11 Conclusion Presented a POSAE approach Some benefits and achievements: Capture software architecture Identify use case scenarios Improve performance. Examples: 25% for one project & 500% for another one Perform modeling & analysis at the early stage. Better document the system. Support product evolution.
12 Ongoing Works & Challenges Tool supports Reverse engineering tools, especially for OO software Reliable performance measurements Performance modeling and analysis to support integration of SPE and software development Design patterns and performance characterization of design patterns Development of best practices and design guidelines
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