BUNGEE An Elasticity Benchmark for Self-Adaptive IaaS Cloud Environments
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1 BUNGEE An Elasticity Benchmark for Self-Adaptive IaaS Cloud Environments Andreas Weber, Nikolas Herbst, Henning Groenda, Samuel Kounev Munich - November 5th, 2015 Symposium on Software Performance
2 Elasticity 2
3 Size Size Characteristics of... Rubber Bands Base Length IaaS Clouds Performance (1 resource unit) Width / Thickness / Force Quality Criteria / SLA Contract Contract Contract Strechability Scalability Elasticity Elasticity Time Time 3
4 4 Comparing Elastic Behavior of... Rubber Bands IaaS Clouds 2 cm Measure Elasticity Independent of demand supply time 2 cm 4 cm Performance and Scalability demand supply time
5 Motivation & Related Work 5
6 6 Why measure Elasticity? Elasticity Major quality attribute of clouds Many strategies exist Industry Academia [Gartner09] [Galante12, Jannings14] Benchmark for comparability! You can t control what you can t measure? (DeMarco) If you cannot measure it, you cannot improve it (Lord Kelvin)
7 7 Related Work: Elasticity Benchmarking Approaches Specialized approaches Measure technical provisioning time Measure SLA compliance Focus on scale up/out [Binning09, Li10, Dory11, Almeida13] Business perspective What is the financial impact? Disadvantage: Mix-up of elasticity technique and business model [Weimann11, Folkerts12, Islam12, Moldovan13, Tinnefeld14]
8 Concept & Implementation 8
9 9 Elasticity Benchmarking Concept System Analysis Analyze the performance of underlying resources & scaling behavior Benchmark Calibration Measurement Elasticity Evaluation
10 intensity # resources resource amount Analyze System Approach Evaluate system separately at each scale Find maximal load intensity that the system can withstand without violating SLOs (binary search) Derive demand step function: resourcedemand = f(intensity) f(intensity) Benefit Derive resource demand for arbitrary load intensity variations load intensity f(intensity) time time 10
11 11 Elasticity Benchmarking Concept System Analysis Analyze the performance of underlying resources & scaling behavior Benchmark Calibration Adjust load profile Measurement Elasticity Evaluation
12 f(intensity) resources intensity f(intensity) intensity resources 12 Benchmark Calibration time time demand time demand time Approach: Adjust load intensity profile to overcome Different performance of underlying resources Different scalability
13 13 Elasticity Benchmarking Concept System Analysis Analyze the performance of underlying resources & scaling behavior Benchmark Calibration Adjust load profile Measurement Expose cloud system to varying load & monitor resource supply & demand Elasticity Evaluation
14 14 Measurement Requirement: Stress SUT in a representative manner Realistic variability of load intensity Adaptability of load profiles to suit different domains Approach: Open workload model [Schroeder06] Model Load Variations with the LIMBO toolkit [SEAMS15Kistowski] Facilitates creation of new load profiles Derived from existing traces With desired properties (e.g. seasonal pattern, bursts) Execute load profile using JMeter Timer-Plugin delays requests according to timestamp file created by LIMBO
15 15 Elasticity Benchmarking Concept System Analysis Analyze the performance of underlying resources & scaling behavior Benchmark Calibration Adjust load profile Measurement Elasticity Evaluation Expose cloud system to varying load & monitor resource supply & demand Evaluate elasticity aspects accuracy & timing with metrics CloudStack
16 resources 16 Metrics: Accuracy (1/3) O 2 U 3 O 3 U 2 O 1 U 1 resource demand T resource supply accuracy U : T U accuracy O : T O
17 resources 17 Metrics: Timeshare (2/3) A 1 B 1 A 2 A 3 B 2 B 3 O 2 U 3 O 3 U 2 O 1 U 1 resource demand T resource supply timeshare U : T A timeshare O : T B
18 resources resources 18 Metrics: Jitter (3/3) resource demand resource supply resource demand resource supply jitter: E S E D T E D : # demand adaptations, E S : # supply adaptations
19 19 Elasticity Benchmarking Concept System Analysis Analyze the performance of underlying resources & scaling behavior Benchmark Calibration Adjust load profile Measurement Elasticity Evaluation Expose cloud system to varying load & monitor resource supply & demand Evaluate elasticity aspects accuracy & timing with metrics CloudStack
20 20 BUNGEE Implementation Java-based elasticity benchmarking framework Components Harness (Benchmark Node) Cloud-side load generation application (CSUT) Automates the four benchmarking activities Extensible with respect to new cloud management software new resource types new metrics CloudStack System Analysis Benchmark Calibration Measurement Elasticity Evaluation Analysis of horizontally scaling clouds based on CloudStack AWS Code is Open Source Quick Start Guide available
21 Evaluation & Case Study 21
22 22 Evaluation & Case Study Evaluation (private cloud) Reproducibility of system analysis Err rel < 5%, confidence 95% for first scaling stage Simplified system analysis Linearity assumption holds for test system Consistent ranking by metrics Separate evaluation for each metric, min. 4 configurations per metric Case Study (private & public cloud) Applicability in real scenario Different performance of underlying resources Metric Aggregation
23 23 Case Study: Configuration F - 1Core Configuration accuarcy O [res. units] accuracy U [res. units] timeshare O [%] timeshare U [%] jitter [adap/min.] elastic speedup violations [%] F 1Core
24 24 Case Study: Config. F - 2Core not adjusted Configuration accuarcy O [res. units] accuracy U [res. units] timeshare O [%] timeshare U [%] jitter [adap/min.] elastic speedup violations [%] F 1Core F 2Core no adjustment
25 25 Case Study: Config. F - 2Core adjusted Configuration accuarcy O [res. units] accuracy U [res. units] timeshare O [%] timeshare U [%] jitter [adap/min.] elastic speedup violations [%] F 1Core F 2Core no adjustment F 2Core adjusted
26 26 Conclusion Goal: Evaluate elastic behavior independent of Performance of underlying resources and scaling behavior Business model Contribution: Elasticity benchmark concept for IaaS cloud platforms Refined set of elasticity metrics Concept implementation: BUNGEE - framework for elasticity benchmarking Evaluation: Consistent ranking of elastic behavior by metrics Case study on AWS and CloudStack Future Work: BUNGEE: Distributed load generation, scale vertically, dif. resource types Experiments: Tuning of elasticity parameters, evaluate proactive controllers
27 27 Literature (1/2) Gartner09: D.C. Plume, D. M. Smith, T.J. Bittman, D.W. Cearley, D.J. Cappuccio, D. Scott, R. Kumar, and B. Robertson. Study: Five Refining Attributes of Public and Private Cloud Computing", Tech. rep., Gartner, Galante12: G. Galante and L. C. E. d. Bona, A Survey on Cloud Computing Elasticity" in Proceedings of the 2012 IEEE/ACM Fifth International Conference on Utility and Cloud Computing, Washington, 2012 Jennings14: B. Jennings and R. Stadler, Resource management in clouds: Survey and research challenges, Journal of Network and Systems Management, pp. 1-53, 2014 Binning09: C. Binnig, D. Kossmann, T. Kraska, and S. Loesing, How is the weather tomorrow?: towards a benchmark for the cloud" in Proceedings of the Second International Workshop on Testing Database Systems, 2009 Li10: A. Li, X. Yang, S. Kandula, and M. Zhang, CloudCmp: Comparing Public Cloud Providers" in Proceedings Dory11: of the 10th ACM SIGCOMM Conference on Internet Measurement, 2010 T. Dory, B. Mejías, P. V. Roy, and N.-L. Tran, Measuring Elasticity for Cloud Databases" in Proceedings of the The Second International Conference on Cloud Computing, GRIDs, and Virtualization, 2011 Almeida13: R.F. Almeida, F.R.C. Sousa, S. Lifschitz, and J.C. Machado: On defining metrics for elasticity of cloud databases, Simpósio Brasileiro de Banco de Dados - SBBD 2013, last consulted Nov Weimann11: J. Weinman, Time is Money: The Value of On-Demand, 2011, last consulted Nov. 2015
28 28 Literature (2/2) Islam12: S. Islam, K. Lee, A. Fekete, and A. Liu, How a consumer can measure elasticity for cloud platforms" in Proceedings of the 3rd ACM/SPEC International Conference on Performance Engineering, New York, 2012 Folkerts12: E. Folkerts, A. Alexandrov, K. Sachs, A. Iosup, V. Markl, and C. Tosun, Benchmarking in the Cloud: What It Should, Can, and Cannot Be in Selected Topics in Performance Evaluation and Benchmarking, Berlin Heidelberg, 2012 Moldovan13: D. Moldovan, G. Copil, H.-L. Truong, and S. Dustdar, MELA: Monitoring and Analyzing Elasticity of Cloud Services, in IEEE 5th International Conference on Cloud Computing Technology and Science (CloudCom), 2013 Tinnefeld14: C. Tinnefeld, D. Taschik, and H. Plattner, Quantifying the Elasticity of a Database Management System, in DBKDA 2014, The Sixth International Conference on Advances in Databases, Knowledge, and Data Applications, 2014 Schroeder06: B. Schroeder, A. Wierman, and M. Harchol-Balter, Open Versus Closed: A Cautionary Tale," in Proceedings of the 3rd Conference on Networked Systems Design & Implementation - Volume 3, ser. NSDI'06. Berkeley, CA, USA: USENIX Association, 2006 SEAMS15Kistowski: Jóakim von Kistowski, Nikolas Roman Herbst, Daniel Zoller, Samuel Kounev, and Andreas Hotho. Modeling and Extracting Load Intensity Profiles. In Proceedings of the 10th International Symposium on Software Engineering for Adaptive and Self-Managing Systems (SEAMS 2015), Firenze, Italy, May 18-19, Herbst13: N. R. Herbst, S. Kounev, and R. Reussner, Elasticity in Cloud Computing: What it is, and What it is Not" in Proceedings of the 10th International Conference on Autonomic Computing, San Jose, 2013
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